WO2017099176A1 - Mail server device, mail management method, and mail management program - Google Patents

Abstract

The present invention restrains growth in data size of electronic mail to be managed, and thereby helps manage electronic mail efficiently. This mail server device comprises: a mail reception means that receives electronic mail; a mail header reading means that, when electronic mail is received by the mail reception means, separates the received mail into shared mail information including body text and a header part; a first storage region; and a second storage region which is differently allocated for each destination of electronic mail, wherein the mail header reading means stores the shared mail information of the received mail in the first storage region, and stores the header part of the received mail in the second storage region allocated for each destination of received mail.

Description

Mail server apparatus, mail management method, and mail management program

[Description of Related Application]
The present invention is based on Japanese Patent Application: Japanese Patent Application No. 2015-240987 (filed on December 10, 2015), and the entire contents of the application are incorporated herein by reference.
The present invention relates to a mail server device, a mail management method, and a mail management program.

When sending an e-mail, using the TO, CC (Carbon Copy), BCC (Blind Carbon Copy), etc., e-mail with the same content (same e-mail text) for two or more destinations It is common to send "mail mail".

Hereinafter, the process of transmitting a broadcast mail to two or more destinations will be described in detail with reference to FIG. 2, FIG. 3, FIG. 4, and FIG.

FIG. 2 is a diagram showing an example of the structure of an electronic mail. The e-mail includes, for example, the information shown in FIG. Specifically, the e-mail is configured to include a header portion and an e-mail text. If an attached file exists, the electronic mail is configured to include a header portion and data in which a plurality of text documents and the attached file are combined into one. The header section, as shown in FIG. 2A, includes a transmission destination address (To, Cc, Bcc), a transmission source address (From), unique information (message ID (Message-ID)) attached to each mail, It includes the subject (Subject), the format of the mail text (Content-Type), and the like. The mail text is configured to include the information shown in FIG. 2B and the mail contents.

FIG. 3 shows an example of the e-mail created in the configuration shown in FIG. FIG. 3 shows an example of an e-mail for the destinations “To: kobe@example.xxx.jp, Cc: kyoto@example.xxx.jp, Bcc: osaka@example.xxx.jp”.

FIG. 4 is a block diagram showing an example of transmission and reception of electronic mail. First, it is assumed that the user creates a mail 3100 shown in FIG. 3 using the mail software 3200 and executes transmission processing. In that case, the terminal device that controls the mail software 3200 transmits the mail 3100 to the mail server 3300 of xxx.example.am using SMTP (Simple Mail Transfer Protocol). Here, it is assumed that xxx.example.am is the domain name of the sender mail server.

The mail server 3300 of xxx.example.am has a function (transmission destination mail server determination function 3310 shown in FIG. 4) of determining a transmission destination mail server. The transmission destination mail server determination function 3310 analyzes the header portion of the received mail to determine the transmission destination mail server. Here, the character string following “@” of the e-mail address of the transmission destination indicates the e-mail server name of the transmission destination. For example, in the case of the e-mail shown in FIG. 3, the character string after “@” of the e-mail address of the transmission destination is “example.xxx.jp”. Therefore, the transmission destination mail server determination function 3310 determines that the transmission destination mail server is the mail server 3400 of example.xxx.jp.

Here, as shown in FIG. 3, the mail server 3300 of xxx.example.am sends one received mail 3100 to the mail server 3400 of example.xxx.jp.

The example. Xxx. Jp mail server 3400 receives one mail 3100 as a mail 3410. The mail server 3400 of example.xxx.jp analyzes the header of the mail 3410. Specifically, the mail server 3400 of example.xxx.jp is a character string following "To, Cc, Bcc" in the header of mail 3410, kobe@example.xxx.jp, kyoto@example.xxx.jp , Read osaka@example.xxx.jp. Here, the character string before “@” of the destination e-mail address is the destination mailbox name. Therefore, in the mail 3410, the mail server 3400 of the example. Xxx. Jp determines that the transmission destination mailbox is the kobe mailbox 3501, the kyoto mailbox 3502, and the osaka mailbox 3503. Then, the mail server 3400 of example. Xxx. Jp stores the mail 3410 as a mail 3511, a mail 3512, and a mail 3513 in the mail box 3501 of kobe, the mail box 3502 of kyoto, and the mail box 350 of osaka, respectively.

Here, for example, it is assumed that the mail software 3600 corresponding to osaka@example.xxx.jp executes the mail reception process. In that case, the terminal device controlling the mail software 3600 transmits a mail request to the mail server 3400 of example.xxx.jp using POP3 (Post Office Protocol 3) or the like. Specifically, the terminal device controlling the mail software 3600 transmits a mail request requesting the transmission of the e-mail of osaka@example.xxx.jp to the mail server 3400 of the example.xxx.jp. The example. xxx. jp mail server 3400 accesses the osaka mailbox 3503 based on the mail request, and extracts the mail 3513. Then, the mail server 3400 of example.xxx.jp transmits the mail 3513 to the terminal device that controls the mail software 3600 using POP3 or the like. The terminal device controlling the mail software 3600 receives the mail 3513 as the mail 3700 and stores it.

FIG. 5 is a block diagram showing an example of processing to be stored in a mailbox when sending a broadcast mail to two or more destinations.

For example, it is assumed that a mail server 4000 (hereinafter referred to as a mail server 4000) of ab shown in FIG. 5 receives an electronic mail. The e-mail received by the mail server 4000 is configured to include a header portion 4100, a mail text 4101, and an attached file 4102. The header portion 4100 includes a transmission destination mail address “1@a.b.c, 2@a.b.c”.

The mail server 4000 stores the received mail in the mailbox 4310 of 1@ab.c and the mailbox 4410 of 2@ab.c. As a result, the mail server 4000 stores the same electronic mail (received electronic mail) in the mail box 4310 of 1 @ abc and the mail box 4410 of 2 @ abc. Specifically, the mail server 4000 stores the header 4300, the mail text 4301, and the attached file 4302 in the mail box 4310 of 1 @ abc and the mail box 4410 of 2 @ abc. It is assumed that the header 4300, the mail text 4301, and the attached file 4302 correspond to the header 4100, the mail text 4101, and the attached file 4102 of the received mail.

Patent Literature 1 describes an electronic mail system including a mail transmission terminal, a mail gateway (a mail GW described in Patent Literature 1), a mail server, a content server, and a mail reception terminal. The e-mail GW described in Patent Document 1 separates the received e-mail into a header portion, an e-mail text, and data of an attached file. Then, the mail server described in Patent Document 1 stores an electronic mail including a header portion and a mail text. Further, the content server described in Patent Document 1 stores data of attached file. And the content server of patent document 1 matches and manages the data of an attached file, and message ID.

Japanese Patent Application Laid-Open No. 2002-073504

The disclosure of the above-mentioned prior art documents is incorporated herein by reference. The following analysis is made from the point of view of the present invention.

As shown in FIG. 4 and FIG. 5, when sending a broadcast e-mail to two or more destinations, the same e-mail (e-mail of the same data) may be stored in each of the destination mail boxes. However, if emails of the same data are stored in two or more mailboxes, the mail server will manage redundant data (duplicate data). Furthermore, storing emails of the same data in two or more mailboxes will increase the size of the stored data.

In addition, when the capacity limit is set for the e-mail managed by the mail server, it is possible to prevent the data size from increasing. However, in the case where the capacity limit is set for emails managed by the mail server, the number of emails to be managed (i.e. stored) is reduced, and the convenience of the user is lowered. For example, when setting a capacity limit for email managed by a mail server, the user needs to be aware of the size of the email stored in the mail server, and the mail server allows the capacity of the mailbox that the mail server allows. If it exceeds, it becomes impossible to receive new mail.

Here, in the technology described in Patent Document 1, each mail box provided in the mail server stores an electronic mail including a header portion and a mail text. Therefore, when sending a broadcast mail to two or more destinations, the mail server described in Patent Document 1 stores electronic mail of the same data in two or more mail boxes. Therefore, the mail server described in Patent Document 1 manages redundant data (duplicate data).

Therefore, it is an object of the present invention to provide a mail server apparatus, a mail management method, and a mail management program that contributes to efficiently managing electronic mail by suppressing an increase in data size of managed electronic mail. Do.

According to a first aspect, a mail server device is provided. The mail server apparatus includes mail receiving means for receiving an electronic mail.
Further, the mail server apparatus includes mail header decrypting means for separating received mail into shared mail information including a mail text and a header portion when the mail receiving means receives the electronic mail. Ru.
Further, the mail server device is configured to include a first storage area.
Furthermore, the mail server apparatus is configured to include a second storage area that is different for each destination of the electronic mail.
The mail header decrypting means stores the shared mail information of the received mail in the first storage area, and the header portion of the received mail in the second storage area for each destination of the received mail. Store.

According to a second aspect, a mail management method is provided. The mail management method includes the step of the mail server apparatus configured to include the first storage area and the second storage area different for each destination of the electronic mail, receiving the electronic mail.
Furthermore, the mail management method includes the step of the mail server device separating the received mail into shared mail information including the mail text and a header portion.
In the separating step, the mail server device stores the shared mail information of the received mail in the first storage area, and the received mail in the second storage area for each destination of the received mail. Stores the header portion of
The present method is linked to a specific machine called an information processing apparatus that controls transmission and reception of electronic mail.

According to a third aspect, a mail management program is provided. The mail management program is a program that causes a computer that controls a mail server device configured to include a first storage area and a second storage area that is different for each destination of an electronic mail.
The mail management program causes the computer to execute a process of receiving an electronic mail.
Further, the mail management program causes the computer to execute a process of separating the received mail into the shared mail information including the mail text and the header portion.
The mail management program stores the shared mail information of the received mail in the first storage area in the separation process, and the received mail in the second storage area for each destination of the received mail. And causing the computer to execute the process of storing the header portion of
The mail management program can be recorded on a computer readable storage medium. The storage medium can be non-transient such as a semiconductor memory, a hard disk, a magnetic recording medium, an optical recording medium, and the like. The invention can also be embodied as a computer program product.

According to each viewpoint, it is an object of the present invention to provide a mail server device, a mail management method, and a mail management program that contributes to efficiently managing electronic mail by suppressing an increase in data size of managed electronic mail. Do.

It is a figure for explaining an outline of one embodiment. It is a figure which shows an example of the structure of an email. It is a figure which shows an example of an email. It is a block diagram which shows an example of transmission / reception of an email. It is a block diagram which shows an example of the process which stores an email in a mailbox. It is a block diagram showing an example of the whole composition of mail server device 10 concerning this embodiment. FIG. 6 is a diagram showing a data structure of records stored in a message ID database 400. It is a flowchart which shows an example of operation | movement at the time of receiving an email. It is a flowchart which shows an example of operation | movement at the time of receiving an email. It is a figure which shows an example of a record. It is a figure which shows an example of a record. It is a figure which shows an example of a record. It is a figure which shows an example of a record. It is a flowchart which shows an example of operation | movement at the time of receiving the request | requirement of an email. It is a flowchart which shows an example of operation | movement at the time of receiving the deletion request | requirement of an email. It is a flowchart which shows an example of operation | movement at the time of receiving the deletion request | requirement of an email. It is a block diagram which shows an example of the whole structure of the mail server device 10a which concerns on 2nd Embodiment. It is a block diagram which shows an example of the whole structure of the mail server device 10b which concerns on 3rd Embodiment.

First, an outline of one embodiment will be described with reference to FIG. The reference symbols of the drawings appended to this summary are added for convenience to each element as an example for aiding understanding, and the description of the summary is not intended to be limiting in any way. Also, in each drawing, connection lines between blocks include both bidirectional and unidirectional. The unidirectional arrows schematically indicate the flow of main signals (data), and do not exclude bidirectionality.

As described above, there is a need for a mail server apparatus that contributes to efficiently managing electronic mail while suppressing an increase in data size of the managed electronic mail.

Therefore, as an example, the mail server device 1 shown in FIG. 1 is provided. The mail server device 1 is configured to include a mail receiving unit 2, a mail header decoding unit 3, a first storage area 4 and a second storage area 5.

When the mail receiving means 2 receives an electronic mail, the mail header decoding means 3 separates the received mail into the shared mail information 31 including the mail body and the header portion 32. Here, the received mail is configured to include shared mail information 61 and a header portion 62. The shared mail information may be a mail text. Alternatively, if the received e-mail includes an attached file, the shared e-mail information may be configured to include an e-mail text and an attached file. The shared email information 31 corresponds to the shared email information 61 of the received email. Further, the header section 32 corresponds to the header section 62 of the received mail. The header portion 32 and the header portion 62 include a message ID (Identification) for identifying an electronic mail.

The mail server device 1 may be configured to include one or more first storage areas 4. The second storage area 5 is a different storage area for each destination of the electronic mail. The mail server device 1 is configured to include one or more second storage areas 5. The second storage area 5 may be configured as a mailbox for each user.

The mail header decrypting means 3 stores the shared mail information 31 of the received mail in the first storage area 4 and stores the header portion 32 of the received mail in the second storage area 5 for each destination of the received mail. The shared mail information 41 shown in FIG. 1 corresponds to the shared mail information 31 shown in FIG. Further, the header 51 shown in FIG. 1 corresponds to the header 32 shown in FIG.

For example, it is assumed that the mail receiving unit 2 receives broadcast mail to two or more destinations. In that case, the mail header decrypting means 3 stores the mail sharing information including the mail text of the received mail in the first storage area 4. In addition, the mail header decoding means 3 stores the header portion of the received mail in the second storage area 5 corresponding to each destination. Therefore, even when the multi-address mails to two or more destinations are received, the mail server device 1 can avoid overlappingly storing the electronic mail of the same data in the two or more mail boxes. Therefore, the mail server device 1 suppresses an increase in the data size of the managed electronic mail, and contributes to efficiently managing the electronic mail.

First Embodiment
The first embodiment will be described in more detail using the drawings. In the following description, the first storage area is called a shared mail storage unit. Further, the second storage area described above corresponds to a so-called personal mailbox. Of course, if the e-mail does not include the attached file, the attached file is excluded in the process described in this document. In the following description, the mail text includes text information of the mail text, an image inserted as the mail text, and the like.

FIG. 6 is a block diagram showing an example of the entire configuration of the mail server device 10 according to the present embodiment.

The mail server device 10 includes a mail receiving unit 200, a mail header decoding unit 300, a message ID database 400, a shared mail storage unit 500, a personal mail box 600, and a mail request receiving unit 700. Ru.

Each component of the mail server device 10 shown in FIG. 6 may be configured in the same device. Alternatively, at least one of the components of the mail server device 10 shown in FIG. 6 may be configured in another device. In that case, connection may be made with other components via a network such as the Internet. Although there are various methods for realizing the network, it is sufficient if the functions described in this document can be realized, and the details are not important.

Specifically, the mail server device 10 is realized using a communication device, a control unit (CPU (Central Processing Unit)), and a storage device included in one or more computers. The storage device is realized by a magnetic disk device, an optical disk device, a semiconductor memory, or the like. The semiconductor memory is, for example, an SSD (Solid State Drive), may use a flash memory, or may include a DRAM (Dynamic Random Access Memory). In addition, the mail server device 10 may be realized by a computer program that causes one or more computers to execute each process using the hardware.

One or more storage devices provided in the mail server device 10 are a first storage area (shared mail storage unit 500) different for each message ID of the electronic mail, and a second storage area different for each destination of the electronic mail And (personal mailbox 600). Furthermore, the storage device provided in the mail server device 10 stores the message ID, information identifying the storage location of the shared email information, and information identifying the storage location of the header section in association with each other. Equipped with The shared mail storage unit 500 (first storage area), the personal mail box 600 (second storage area), and the third storage area may be configured in the same storage device. Alternatively, shared mail storage unit 500 (first storage area), personal mail box 600 (second storage area), and third storage area may be configured in different storage devices.

<E-mail receiving means 200>
The mail receiving unit 200 is connected to a mail server (hereinafter referred to as "other mail server 100") different from the mail server apparatus 10 via a network such as the Internet. Specifically, the mail reception unit 200 is configured to include a communication device connected to the network. Then, the mail receiving unit 200 receives the e-mail sent by the SMTP from the other mail server 100. Then, the mail receiving unit 200 transmits the received electronic mail (hereinafter, also simply referred to as “electronic mail”) to the mail header decoding unit 300.

<Email header decoding means 300>
The mail header decrypting means 300 separates the electronic mail into the shared mail information including the mail text and the header portion. Here, the shared mail information is information including at least a mail text, and may be configured to include a mail text and an attached file. That is, as shown in FIG. 6, the e-mail header decrypting means 300 separates the e-mail into the header portion 301, the e-mail text 302 and the attached file 303. The mail header decrypting means 300 may be realized, for example, using a CPU.

Then, the mail header decrypting unit 300 stores the shared mail information of the electronic mail in the first storage area (shared mail storage unit 500) corresponding to the message ID of the electronic mail. Furthermore, the mail header decrypting means 300 stores the header portion of the electronic mail in the second storage area (personal mail box 600) for each destination of the electronic mail.

<Message ID Database 400>
As shown in FIG. 6, the message ID database 400 stores information 401 in which a message ID, a header portion, a mail text, and an attached file are associated. Specifically, the message ID database 400 stores, as a record, information in which the message ID, information specifying the storage location of the shared mail information, and information specifying the storage location of the header section are associated. When the message ID database 400 stores two or more message IDs, for each message ID, the message ID, information specifying the storage location of the shared mail information, and information specifying the storage location of the header section Corresponds and stores. The message ID database 400 is configured to include a third storage area that stores one or more records.

FIG. 7 is a diagram showing a data structure of records stored in the message ID database 400. As shown in FIG.

The information for specifying the storage location of the shared mail information is information for specifying the location of the shared mail storage unit 500. That is, the information specifying the storage location of the shared e-mail information is information indicating the e-mail text and the storage destination of the attached file. For example, the information specifying the location where the shared mail information is stored may be the mail text, the file path of the storage destination of the attached file, or the like. Here, the information specifying the location where the shared mail information is stored may be any information that becomes accessible to the stored mail body and attached file after storage, and the details are not important.

Further, the information specifying the storage location of the header portion is information specifying the personal mail box 600 (hereinafter, also referred to as “personal mail box information”). For example, the personal mailbox information may be a transmission destination address (a mail address indicated by To, Cc, and Bcc) of the header portion of the electronic mail.

Also, the message ID database 400 has a function of controlling the stored records. Specifically, the message ID database 400 has a function of maintaining a state in which message IDs do not overlap.

The message ID database 400 extracts a record to be stored in response to the search request from the mail request reception means 700, and sends it back to the search request source. The message ID database 400 also has functions such as search, result response, information update, and information deletion.

<Shared Mail Storage Unit 500>
As described above, the shared mail storage unit 500 is configured to include different storage areas for each message ID of the electronic mail. The shared mail storage unit 500 stores shared mail information of the electronic mail. Specifically, the shared mail storage unit 500 stores the mail text 302 of the electronic mail and the attached file 303. Furthermore, the shared mail storage unit 500 includes a storage area and has a function of executing reading and writing of information to the storage area.

<Personal mailbox 600>
The personal mailbox 600 stores the header portion (header portion 301 shown in FIG. 6) of the electronic mail. Furthermore, the personal mailbox 600 includes a storage area and performs reading and writing of information with respect to the storage area.

As described above, the personal mailbox 600 is configured to include different storage areas for each destination of the e-mail. That is, it is assumed that a storage area different for each recipient of the e-mail is allocated as a storage area constituting the personal mailbox.

For example, it is assumed that an e-mail corresponding to one message ID is an e-mail for two or more destinations. In that case, the e-mail header decoding unit 300 stores the header portion 301 of the e-mail in the personal e-mail box 600 corresponding to each destination. Then, the mail header decoding unit 300 stores the shared mail information corresponding to the message ID, specifically, the mail text 302 of the electronic mail and the attached file 303 in the shared mail storage unit 500.

<Email request acceptance means 700>
The mail request reception unit 700 is connected to a terminal device that controls a mailer application program (hereinafter, also referred to as receiver mail software 800) via a network such as the Internet. Specifically, the mail request accepting unit 700 is configured to include a communication device connected to the network. Then, the mail request reception means 700 receives the mail request or the mail deletion request transmitted by the receiver mail software 800 by the POP3 or the like. In the following description, the mail request means a request for obtaining the header part of the electronic mail, the mail text, and the attached file. Further, in the following description, the mail deletion request means a request for deleting the header part of the received electronic mail, the mail text, and the attached file. The mail receiving unit 200 and the mail request receiving unit 700 may be realized using the same communication device. Alternatively, the mail receiving unit 200 and the mail request receiving unit 700 may be realized using different communication devices. Furthermore, the mail request reception means 700 may realize the processing described in this document using a CPU.

Next, the mail header decrypting means 300 will be described in detail.

The mail header decrypting means 300 acquires the message ID from the header section 301 of the received mail. Then, the mail header decrypting means 300 determines whether the acquired message ID is stored in the message ID database 400 or not.

It is assumed that the acquired message ID is not stored in the message ID database 400. In that case, the mail header decrypting means 300 creates a record in which the message ID, the information specifying the storage location of the shared mail information, and the information specifying the second storage area (personal mail box) are associated. . Here, it is assumed that the identified personal mailbox 600 corresponds to one destination in the header portion corresponding to the acquired message ID. Then, the mail header decrypting means 300 registers the created record in the message ID database 400.

On the other hand, it is assumed that the acquired message ID is stored in the message ID database 400. In that case, it means that the record corresponding to the acquired message ID is registered in the message ID database 400. Therefore, the message header decrypting means 300 specifies the record corresponding to the acquired message ID. Then, the message header decrypting means 300 adds the information specifying the second storage area (personal mailbox) corresponding to the destination of the electronic mail to the specified record. Here, the personal mailbox 600 to be identified corresponds to another destination different from the one destination in the header portion corresponding to the message ID.

Next, the case where the mail request reception means 700 receives a mail request will be described in detail.

When the mail request reception means 700 receives the mail request, the mail request reception means 700 acquires the header portion 301 from the second storage area (personal mail box 600) corresponding to the mail request source. Specifically, the mail request reception means 700 identifies the mail request source (ie, the recipient of the e-mail) and identifies the personal mail box 600 to be accessed. Then, the mail request accepting means 700 accesses the identified personal mail box 600 and acquires the header portion 301 stored in the personal mail box 600.

It is assumed that the mail request accepting unit 700 can access the identified personal mailbox 600. Therefore, when the personal mail box 600 is in an inaccessible state, the mail request reception means 700 changes the personal mail box 600 to an accessible state. Further, when the personal mail box 600 is stored in a device different from the mail request reception means 700, the mail request reception means 700 performs processing such as connecting to the device etc. in which the personal mail box 600 is stored. Run.

Then, the mail request reception unit 700 specifies the first storage area (shared mail storage unit 500) based on the message ID included in the acquired header section 301, and the shared mail information, specifically, the e-mail. The mail text 302 and the attached file 303 are acquired.

Specifically, the mail request accepting unit 700 acquires (extracts) the message ID from the acquired header section 301. Then, the mail request accepting unit 700 searches the message ID database 400 using the acquired message ID as a search key, and acquires (extracts) a record. Then, the mail request reception means 700 specifies information for specifying the storage location (first storage area) of the shared mail information, specifically, the mail text 302 of the electronic mail and the attached file 303, from the acquired record. Acquire (extract). Then, the mail request reception unit 700 accesses the storage location of the specified shared mail information, and acquires the shared mail information. That is, the mail request reception unit 700 acquires the mail text 302 and the attached file 303 from the storage location of the specified shared mail information.

Then, the mail request reception unit 700 combines the acquired header portion 301 and the acquired shared mail information, specifically, the mail text 302 of the electronic mail, and the attached file 303 to create an electronic mail. In the following description, the header portion acquired by the mail request accepting unit 700, the acquired mail text, and the acquired attached file are also referred to as a header portion 701, a mail text 702, and an attached file 703, respectively.

Then, the mail request reception unit 700 transmits the created electronic mail to the mail request source. That is, the mail request accepting unit 700 transmits the created electronic mail to a terminal device (hereinafter, also referred to as a “client terminal”) that controls the recipient mail software 800. For example, the mail request reception unit 700 transmits an electronic mail including the header portion 701, the mail text 702, and the attached file 703 shown in FIG. 6 to the client terminal.

Next, the case where the mail request reception means 700 receives a mail deletion request will be described in detail.

When receiving the mail deletion request, the mail request reception means 700 specifies the storage location of the header part and the header part to be deleted based on the mail deletion request. Specifically, the mail request reception means 700 specifies the personal mail box 600 of the mail deletion request source. Then, the mail request reception unit 700 specifies the header portion 301 stored in the specified personal mail box 600.

Then, based on the message ID included in the header part to be deleted, the mail request accepting means 700 deletes the information specifying the personal mail box 600 to be deleted from the record of the message ID database 400. Specifically, the mail request reception unit 700 specifies the message ID included in the header of each deletion target electronic mail. Then, the mail request accepting means 700 refers to the records of the message ID database 400 and deletes the information specifying the personal mailbox 600 of the personal mailbox information recorded in the record of each identified message ID.

Then, the mail request accepting means 700 deletes the header portion 301 stored in the identified personal mail box 600.

Then, the mail request accepting means 700 determines whether any information is registered in the information specifying the personal mailbox in the personal mailbox information of the record of the message ID database 400.

As a result of the determination, if the information specifying the personal mailbox is empty, the mail request accepting means 700 determines the shared mail information of the record of the message ID database 400, specifically, the mail text 302 of the electronic mail, The storage location of the attached file 303 is specified.

Then, the mail request reception unit 700 deletes the specified shared mail information, specifically, the mail text 302 of the electronic mail and the attached file 303.

Then, the mail request accepting means 700 deletes the record of the message ID database 400.

Next, the operation of the mail server device 10 according to the present embodiment will be described in detail.

<Receive email>
First, the operation when the mail server device 10 receives an e-mail will be described in detail. In the following description, the mail server device 10 exemplifies and describes the case where the e-mail shown in FIG. 3 is received. That is, in the following description, the message ID is "20150610123456789@xxx.example.am", the destination is "To: kobe@example.xxx.jp, Cc: kyoto@example.xxx.jp, Bcc: osaka @ The case of receiving an e-mail of example.xxx.jp will be illustrated and described. The structure of the e-mail shown in FIG. 2 and the e-mail shown in FIG. 3 are an example, and the e-mail according to this embodiment is limited to the structure shown in FIG. 2 and the e-mail shown in FIG. is not.

FIGS. 8 and 9 are flowcharts showing an example of the operation when an electronic mail is received. In the initial state, it is assumed that the message ID “20150610123456789@xxx.example.am” is not registered in the message ID database 400.

First, it is assumed that the mail reception means 200 receives an electronic mail by SMTP (step A1 shown in FIG. 8). For example, the e-mail receiving unit 200 receives an e-mail shown in FIG. 3 created by the structure shown in FIG. 2 by using SMTP.

When the e-mail is received, the e-mail receiving means 200 transmits the received e-mail to the e-mail header decrypting means 300 (step A2). That is, the mail receiving means 200 transmits the data of the received mail to the mail header decoding means 300.

In step B1, the mail header decrypting means 300 receives the received mail from the mail receiving means 200. In step B2, the mail header decrypting unit 300 acquires the header portion of the received mail. Specifically, the mail header decrypting unit 300 extracts the header portion of the received mail based on the structure of the electronic mail (for example, the structure shown in FIG. 2). Then, at step B3, the mail header decrypting means 300 extracts the message ID from the header portion.

In step B4, the mail header decrypting means 300 retrieves the message ID. Specifically, the mail header decrypting means 300 transmits, to the message ID database 400, an instruction to search for a record including the extracted message ID. In other words, the mail header decrypting unit 300 transmits an instruction to search a record to the message ID database 400 using the extracted message ID as a search key.

In step C1, the message ID database 400 executes a search. Specifically, the message ID database 400 searches for a record including the message ID of the received mail, and returns the search result to the mail header decrypting means 300.

In step B5, the mail header decrypting means 300 determines whether a record including the message ID which is a search key is stored in the message ID database 400 or not.

Here, it is assumed that the search key is the message ID “20150610123456789@xxx.example.am”. Then, it is assumed that the message ID “20150610123456789@xxx.example.am” is unregistered in the message ID database 400. In that case, the mail header decrypting means 300 determines that the record including the message ID which is the search key is not stored in the message ID database 400.

If the record including the message ID which is the search key is not stored in the message ID database 400 (No in step B5), the process proceeds to step B8 shown in FIG. On the other hand, when the record including the message ID which is the search key is stored in the message ID database 400 (Yes in step B5), the process proceeds to step B6. The processes after step B6 will be described later.

In step B8 shown in FIG. 9, the mail header decrypting means 300 creates a new record. Specifically, the mail header decrypting means 300 transmits an instruction to create a record whose message ID is a search key. For example, it is assumed that the search key is the message ID “20150610123456789@xxx.example.am”. In that case, the mail header decrypting means 300 transmits, to the message ID database 400, an instruction to create a record including the message ID "20150610123456789@xxx.example.am".

For example, as shown in FIG. 10, the message ID database 400 may create, as a record, data that associates the message ID, the location of the shared mail storage unit 500, and the personal mailbox information. Then, the message ID database 400 may register the message ID “20150610123456789@xxx.example.am” in the created data (see FIG. 10). Although FIG. 10, FIG. 11, FIG. 12, and FIG. 13 show data in the form of a table, it is not intended to limit records to the form of a table. The record may be any information in which the message ID, the location of the shared mail storage unit 500, and the personal mailbox information are associated with each other, and the details do not matter.

Then, the mail header decoding means 300 stores the mail text and the attached file in the shared mail storage unit 500 (step B9, step D1). Specifically, the e-mail header decoding unit 300 extracts the e-mail text and the attached file from the e-mail based on the structure of the e-mail (for example, the structure shown in FIG. 2). Then, the mail header analysis unit 300 stores the extracted mail body and the attached file in the shared mail storage unit 500. Here, it is assumed that the mail header analysis means 300 stores the extracted mail body and the attached file in the free space of the shared mail storage unit 500.

In step B10, the mail header decrypting means 300 writes information identifying the location of the shared mail storage unit 500 in the message ID database 400. Specifically, the mail header decrypting unit 300 transmits, to the message ID database 400, an instruction to write information specifying the location of the shared mail storage unit 500 in the record. As described above, the information specifying the location of the shared mail storage unit 500 may be, for example, a file path or the like. The information specifying the location of the shared mail storage unit 500 may be any information that can be accessed after storage of the stored mail text and attached file, regardless of the details.

In step C4, the message ID database 400 writes information for specifying the location of the shared mail storage unit 500. Specifically, the message ID database 400 writes the information specifying the location of the shared mail storage unit 500 in the record in response to the command issued by the mail header decrypting unit 300 (see FIG. 11).

In step B11, the mail header decrypting means 300 adds the information specifying the personal mail box 600 to the personal mail box information of the message ID database 400. Specifically, the mail header decrypting unit 300 transmits, to the message ID database 400, an instruction to add information identifying the personal mailbox 600 to the record.

In step C5, the message ID database 400 adds information identifying the personal mailbox 600. Specifically, the message ID database 400 adds information specifying the personal mail box 600 to the record in response to the command issued by the mail header decrypting means 300. For example, as shown in FIG. 12, the message ID database 400 includes the account portion of the mail address (the account “kobe” of the destination mail address “kobe@example.xxx.jp” shown in FIG. 3 in the case of FIG. 12) It may be added to personal mailbox information. The personal mailbox information shown in FIG. 12 is an example, and the personal mailbox information is not limited to the account portion of the e-mail address. The personal mailbox information may be any information that specifies the personal mailbox 600, and the details thereof are not important.

In step B12, the mail header decrypting means 300 transmits the header portion to the personal mail box 600. Then, in step E2, the personal mail box 600 stores the header portion transmitted by the mail header decrypting means 300. Specifically, the mail header decoding means 300 transmits the header portion of the e-mail shown in FIG. 3 to the personal mail box 600 of the account "kobe". Then, the personal mailbox 600 of the account "kobe" stores the transmitted header portion (the header portion of the e-mail shown in FIG. 3).

Next, the operation of the mail server apparatus 10 will be described in detail with respect to other destinations other than the registered one destination in the header portion corresponding to the message ID. In the following description, it is assumed that one registered destination is “kobe@example.xxx.jp” and the other destination is “kyoto@example.xxx.jp”. Further, in the following description, the mail server device 10 has already received the e-mail shown in FIG. 3 (the e-mail with the message ID “20150610123456789@xxx.example.am”), and has already created the record shown in FIG. Suppose that there is.

As described above, in step B5 shown in FIG. 8, the mail header decrypting means 300 determines whether a record including the message ID which is a search key is stored in the message ID database 400 or not.

Here, it is assumed that the mail header decrypting unit 300 determines that the record including the message ID as the search key is stored in the message ID database 400. In that case, the mail header decrypting means 300 adds the information specifying the personal mail box 600 to the personal mail box information of the message ID database 400 (step B6). Specifically, the mail header decrypting means 300 transmits, to the message ID database 400, an instruction to add the information specifying the personal mail box 600 to the personal mail box information corresponding to the message ID in the record.

In step C2, the message ID database 400 adds information identifying the personal mailbox 600. Specifically, the message ID database 400 adds information specifying the personal mail box 600 to the personal mail box information corresponding to the message ID in response to the command issued by the mail header decrypting means 300. For example, as shown in FIG. 13, the message ID database 400 includes the account portion of the mail address (in the case of FIG. 13, the account "kyoto" of the destination mail address "kyoto@example.xxx.jp" shown in FIG. 3) It may be added to personal mailbox information.

In step B7, the mail header decoding unit 300 transmits the header portion to the personal mail box 600 of the transmission destination. Then, in step E1, the personal mail box 600 stores the header portion transmitted by the mail header decrypting means 300. Specifically, the mail header decoding unit 300 transmits the header portion of the e-mail shown in FIG. 3 to the personal mail box 600 of the account "kyoto". Then, the personal mail box 600 of the account "kyoto" stores the transmitted header portion (the header portion of the e-mail shown in FIG. 3).

<Email request>
Next, the operation when the mail server device 10 receives an e-mail request from the e-mail destination will be described in detail. In the following description, the mail server apparatus 10 receives the e-mail shown in FIG. 3, and receives the e-mail request from the e-mail destination "kobe@example.xxx.jp". explain.

FIG. 14 is a flowchart showing an example of the operation when the mail server device 10 receives a request for electronic mail from the destination of electronic mail.

First, it is assumed that the mail request reception means 700 receives a mail request from the client terminal (step F1 shown in FIG. 14). Specifically, the mail request receiving unit 700 receives a mail request such as POP3 from the client terminal. For example, the mail request receiving unit 700 receives a mail request such as POP3 from the client terminal of "kobe@example.xxx.jp".

When the mail request reception means 700 receives a mail request from the client terminal, it specifies the personal mail box 600 (step F2). Specifically, the mail request reception means 700 specifies the mail request source based on the mail request. Then, the mail request reception unit 700 specifies the personal mail box 600 corresponding to the mail request source. For example, when receiving an e-mail request from the e-mail destination “kobe@example.xxx.jp”, the e-mail request receiving unit 700 specifies the personal mailbox 600 of the account “kobe”.

In step F3, the mail request receiving means 700 requests a header portion. Specifically, the mail request reception means 700 requests the specified personal mail box 600 to transmit the header portion of the electronic mail. Here, the mail request receiving unit 700 may request the header portion of each electronic mail regarding two or more electronic mails for which the client terminal of the mail request source has not received.

At step E2, the personal mailbox 600 sends the header to the mail request accepting means 700. Specifically, personal mail box 600 responds to the request for the header section from mail request acceptance section 700, and transmits the stored header section to mail request acceptance section 700.

In step F4, the mail request receiving unit 700 acquires the header portion. In step F5, the mail request receiving unit 700 extracts the message ID. Specifically, the mail request accepting means 700 extracts the message ID from the acquired header part. For example, the mail request reception unit 700 acquires the header portion of the e-mail with the message ID “20150610123456789@xxx.example.am” from the personal mail box 600 of the account “kobe” of the mail request source. Then, the message request accepting means 700 extracts the message ID “20150610123456789@xxx.example.am” from the acquired header part.

In step F6, the mail request receiving unit 700 searches for a message ID. Specifically, the mail request accepting unit 700 transmits, to the message ID database 400, an instruction for searching a record including the extracted message ID.

At step C6, the message ID database 400 returns a record. Specifically, the message ID database 400 receives a command issued by the mail request receiving unit 700, searches a record including the message ID, and returns the search result to the mail request receiving unit 700. For example, the message ID database 400 returns the record shown in FIG. 13 including the message ID “20150610123456789@xxx.example.am” to the mail request accepting means 700.

In step F7, the mail request receiving unit 700 acquires information specifying the location of the shared mail storage unit 500. Specifically, based on the search result obtained from the message ID database 400, the mail request reception unit 700 acquires information for specifying the location of the shared mail storage unit 500.

In step F8, the mail request receiving unit 700 requests the mail text and the attached file. Specifically, the mail request reception unit 700 requests transmission of the mail text and the attached file stored in the specified shared mail storage unit 500. Then, in step D2, the shared mail storage unit 500 transmits the mail text and the attached file to the mail request receiving unit 700. For example, it is assumed that the mail text shown in FIG. 3 corresponding to the e-mail with the message ID “20150610123456789@xxx.example.am” is stored in the shared mail storage unit 500. In that case, the mail request reception unit 700 acquires the mail text shown in FIG. 3 from the identified shared mail storage unit 500.

In step F9, the mail request receiving unit 700 combines the header portion, the mail text, and the attached file. Specifically, the mail request receiving unit 700 combines the acquired header portion, the acquired mail body, and the acquired attached file, and restores the electronic mail. For example, it is assumed that the message ID database 400 stores the records shown in FIG. Then, it is assumed that the mail server device 10 receives an e-mail request from a client terminal of the account "kobe". In that case, the mail request reception means 700 executes the above-mentioned processing to restore the e-mail shown in FIG.

In step F10, the mail request reception unit 700 responds to the mail request. Specifically, the mail request reception unit 700 transmits the restored electronic mail to the client terminal of the mail request source. In the case where the mail request reception means 700 receives a mail request from a client terminal corresponding to "osaka@example.xxx.jp" shown in FIG. Do.

<Delete mail>
Next, the operation when the mail server device 10 receives a mail deletion request from the client terminal will be described in detail. The following description exemplifies a case where the mail server device 10 receives the e-mail shown in FIG. 3 and receives an e-mail deletion request from the e-mail destination “kyoto@example.xxx.jp”. Explain.

FIGS. 15 and 16 are flowcharts showing an example of the operation when the mail server device 10 receives an e-mail deletion request from the e-mail destination.

First, it is assumed that the mail request reception means 700 receives a mail deletion request from the client terminal (step F11 shown in FIG. 15). Specifically, the mail request receiving unit 700 receives a mail deletion request using POP3 or the like from the client terminal.

When receiving the mail deletion request, the mail request receiving unit 700 specifies the personal mail box 600 (step F12). Specifically, the mail request reception means 700 specifies the personal mail box 600 based on the mail deletion request. For example, the mail request reception unit 700 may specify the personal mail box 600 based on the information on the transmission source of the mail deletion request. When an e-mail deletion request is received from the e-mail destination “kyoto@example.xxx.jp”, the e-mail request receiving unit 700 specifies the personal mail box 600 corresponding to the account “kyoto”.

In step F13, the mail request receiving unit 700 requests the header portion from the identified personal mail box 600. Specifically, the mail request receiving unit 700 requests the identified personal mail box 600 to transmit the header portion.

At step E3, the personal mailbox 600 sends a header portion. Specifically, personal mail box 600 specified by mail request accepting means 700 extracts the header portion to be stored in response to the request from mail request accepting means 700, and the extracted header portion is sent to mail request accepting means 700. Send. In addition. The personal mailbox 600 may extract header parts of two or more e-mails from the storage area of the personal mail box 600, and may transmit the extracted two or more header parts to the mail request accepting means 700.

In step F14, the mail request receiving unit 700 acquires the header portion. Then, in step F15, the mail request accepting unit 700 extracts the message ID from the acquired header portion.

In step F16, the mail request receiving unit 700 requests the message ID database 400 to delete personal mailbox information. Specifically, the mail request accepting unit 700 transmits, to the message ID database 400, an instruction to delete information specifying the predetermined personal mailbox 600 from the record including the extracted message ID. Here, the predetermined personal mailbox 600 means the personal mailbox 600 corresponding to the mail deletion request source. The instruction is configured to include the extracted message ID.

For example, it is assumed that the e-mail deletion request source account is "kyoto". In that case, the mail request accepting means 700 transmits an instruction to delete the information specifying the personal mail box 600 of the account “kyoto” from the message ID database 400.

In step C7, the message ID database 400 deletes the personal mailbox information requested for deletion from the record. Specifically, in response to the command issued by the mail request receiving unit 700, the message ID database 400 searches one or more records that store the message ID included in the command as a search key. Then, the message ID database 400 specifies a record including the message ID which is a search key. Then, the message ID database 400 deletes the information identifying the personal mailbox 600 corresponding to the mail deletion request source from the identified record.

For example, it is assumed that the mail server device 10 has received the e-mail shown in FIG. 3 and has received the e-mail deletion request. Here, it is assumed that the e-mail deletion request source account is “kyoto”. Then, it is assumed that the message ID that is the search key is "201506 10123456789@xxx.example.am". In that case, the message ID database 400 specifies the record shown in FIG. 13 using the message ID “20150610123456789@xxx.example.am” as a search key. Then, the message ID database 400 deletes the account "kyoto" from the personal mailbox information of the identified record, and updates the record as shown in FIG.

In step F17, the mail request receiving unit 700 requests deletion of the header portion stored in the personal mail box 600. Specifically, the mail request accepting means 700 requests the personal mail box 600 to delete the header portion stored in the specified personal mail box 600.

At step E4, the personal mailbox 600 deletes the header portion. Specifically, personal mailbox 600 deletes the stored header portion. Then, the process proceeds to step F18 shown in FIG.

In step F18 shown in FIG. 16, the mail request accepting means 700 requests the message ID database 400 to search for the message ID. Specifically, the mail request accepting unit 700 transmits an instruction to search the extracted message ID to the message ID database 400.

At step C8, the message ID database 400 executes a search. Specifically, the message ID database 400 searches for a record including the message ID of the search key, and transmits the search result to the mail request accepting means 700.

In step F19, the mail request receiving unit 700 determines whether information is registered in the personal mailbox information. Specifically, in the record (ie, the search result) transmitted from the message ID database 400, the mail request accepting means 700 determines whether or not the information is registered in the personal mailbox information. For example, when the acquired record is in the state shown in FIG. 12, the mail request receiving unit 700 determines that the information is registered in the personal mailbox information. On the other hand, when the acquired record is in the state shown in FIG. 11, the mail request receiving unit 700 determines that the information is not registered in the personal mailbox information.

If the information is registered in the personal mailbox information (Yes in step F19), the mail server device 10 ends the process of deleting the electronic mail.

On the other hand, when the information is not registered in the personal mailbox information (No in step F19), the mail request accepting means 700 executes the command to delete the shared mail information corresponding to the acquired record, the shared mail It transmits to the storage part 500 (step F20).

In step D3, the shared mail storage unit 500 deletes the shared mail information. Specifically, shared mail storage unit 500 deletes the mail text and the attached file corresponding to the acquired record.

In step F21, the mail request receiving unit 700 transmits a record deletion command to the message ID database 400. Specifically, the mail request receiving unit 700 transmits an instruction to delete the acquired record to the message ID database 400.

In step C9, the message ID database 400 executes deletion. Specifically, the message ID database 400 deletes the record that has received the deletion instruction.

[Modification 1]
As a modification 1 of the mail server device 10 according to the present embodiment, a mail deletion request including information for specifying a deletion target electronic mail may be received. For example, the information specifying the e-mail to be deleted may be a message ID, a transmission date and time, a reception date and time, information on a transmission source (e-mail address, account name, etc.) and the like. The information for specifying the e-mail to be deleted only needs to specify the e-mail to be deleted, and the details thereof are not limited.

In the case where the mail deletion request includes information specifying an electronic mail to be deleted, it is preferable that the request to send the header part includes information specifying an electronic mail to be deleted. Alternatively, if the mail deletion request includes the information specifying the deletion target electronic mail, the personal mail box 600 extracts the header part based on the information specifying the deletion target electronic mail, and the extracted header The part may be sent to the mail request acceptance means 700. For example, when the mail deletion request includes the message ID of the deletion target electronic mail, the personal mail box 600 extracts the header portion including the message ID.

As described above, the mail server device 10 according to the present embodiment stores the shared mail information including the mail text in the first storage area (shared mail storage unit 500) different for each message ID. In addition, the mail server device 10 according to the present embodiment stores the header portion in the second storage area (individual mail box 600) different for each destination. For example, when the mail server device 10 receives an electronic mail for two or more destinations, the mail text of the electronic mail is stored in the shared mail storage unit 500, and the header portion is stored in the personal mail box 600 corresponding to each destination. Store in Therefore, the mail server device 10 according to the present embodiment avoids managing redundant data (duplicate data). Therefore, the mail server device 10 according to the present embodiment suppresses the increase in the data size of the managed electronic mail, and contributes to efficiently managing the electronic mail.

Second Embodiment
Next, a second embodiment will be described.

In the present embodiment, the header portion and the shared mail information are stored in the first storage area, and the header portion is stored in the second storage area. In the description of the present embodiment, the description of the parts overlapping with the above embodiment will be omitted. Furthermore, in the description of the present embodiment, the same components as those of the above-described embodiment are denoted by the same reference numerals, and the description thereof will be omitted. Further, in the description of the present embodiment, the description of the same effects as those of the above-described embodiment will be omitted.

FIG. 17 is a block diagram showing an example of the entire configuration of the mail server device 10a according to the present embodiment. In the following description, differences from the mail server device 10 according to the first embodiment will be described in detail.

The mail header decoding unit 300a according to the present embodiment stores the header portion acquired from the received mail and the shared mail information in the first storage area (shared mail storage unit 500) corresponding to the message ID of the received mail. . Further, the mail header decoding unit 300a according to the present embodiment stores the header portion acquired from the received mail in the second storage area (personal mail box 600) for each destination of the received mail.

The data size of the header section is often smaller than the data size of the mail body. Therefore, even if the header portion and the mail text are stored in shared mail storage unit 500, the influence on the usable capacity of shared mail storage unit 500 is small. However, storing the header and the mail text in the shared mail storage unit 500 combines the header and the mail text and contributes to reducing the processing time in the processing for restoring the electronic mail. . Therefore, the mail server device 10a according to the present embodiment contributes to more efficiently managing electronic mail while suppressing an increase in data size of the managed electronic mail.

Third Embodiment
Next, a third embodiment will be described.

In the present embodiment, the header portion and the shared mail information are stored in the first storage area, and the message ID in the header portion is stored in the second storage area. In the description of the present embodiment, the description of the parts overlapping with the above embodiment will be omitted. Furthermore, in the description of the present embodiment, the same components as those of the above-described embodiment are denoted by the same reference numerals, and the description thereof will be omitted. Further, in the description of the present embodiment, the description of the same effects as those of the above-described embodiment will be omitted.

The configuration of the mail server device 10b according to the present embodiment is as shown in FIG. In the following description, differences from the mail server device 10 according to the first embodiment will be described in detail.

The mail header decoding unit 300b according to the present embodiment stores the header portion acquired from the received mail and the shared mail information in the first storage area (shared mail storage unit 500) corresponding to the message ID of the received mail. . Further, the mail header decoding unit 300b according to the present embodiment stores the message ID 304 of the header portion in the second storage area (personal mail box 600) for each destination of the received mail.

As described above, the data size of the header portion is often smaller than the data size of the mail text. Therefore, even if the header portion and the mail text are stored in shared mail storage unit 500, the influence on the usable capacity of shared mail storage unit 500 is small. Further, by storing the message ID in the personal mail box 600 instead of the header portion, it is possible to suppress an increase in the data size of the electronic mail to be managed according to the second embodiment. Therefore, the mail server device 10b according to the present embodiment contributes to further suppressing the increase in the data size of the managed email while efficiently managing the email.

Some or all of the above-described embodiments may be described as in the following forms, but is not limited thereto.

(Mode 1) The mail server apparatus according to the first aspect is as described above.

(Mode 2) A message ID storing, as a record, information in which the message ID of the received mail, the information specifying the storage location of the shared mail information, and the information specifying the storage location of the header section are associated with each other The mail server device according to appendix 1, further comprising a database.

(Mode 3) The message ID database stores, as the record, information in which the message ID, information specifying a storage location of the shared mail information, and information specifying a personal mailbox are associated with each other. The mail server device according to 2.

(Mode 4) The mail request receiving means is further configured to receive the mail request, and the mail request receiving means receives the mail request from the second storage area corresponding to the mail request source. The header section is acquired, the first storage area is identified based on the message ID included in the acquired header section, and the shared mail information is acquired from the identified first storage area, The email according to any one of Appendices 1 to 3, which combines the acquired header portion and the acquired shared email information to create an email, and transmits the created email to the email request source. Server device.

(Mode 5) When the mail request reception means receives a mail deletion request, and the mail request reception means receives the mail deletion request, the storage location of the header part to be deleted and the header part to be deleted The mail server device according to Supplementary Note 4, wherein the storage location of the shared mail information is specified based on the message ID included in the header part of the deletion target.

(Mode 6) The mail header decrypting means acquires a message ID from the header of the received mail, and determines whether the acquired message ID is stored in the message ID database, and the acquired message If the ID is not stored in the message ID database, the message ID, the information specifying the storage location of the shared mail information, and the header corresponding to the acquired message ID correspond to one destination. The mail server device according to any one of appendices 1 to 5, wherein the record associating the information specifying the second storage area is created, and the created record is registered in the message ID database.

(Mode 7) When the acquired message ID is stored in the message ID database, the mail header decrypting unit specifies the record corresponding to the acquired message ID, and the header corresponding to the message ID The mail server device according to claim 6, wherein information specifying the second storage area corresponding to another destination different from the one destination among the units is added to the specified record.

(Mode 8) The mail header decrypting means stores the header portion obtained from the received mail and the shared mail information in the first storage area corresponding to the message ID of the received mail, and the reception is performed. The mail server device according to any one of appendices 1 to 7, wherein the header section acquired from the received mail is stored in the second storage area for each mail destination.

(Mode 9) The mail header decrypting means stores the header portion obtained from the received mail and the shared mail information in the first storage area corresponding to the message ID of the received mail, and the reception is performed. The mail server device according to any one of appendices 1 to 8, wherein the message ID of the received mail is stored in the second storage area for each mail destination.

(Mode 10) The mail management method according to the second aspect is as described above.

(Mode 11) A step of storing, as a record, information in which the message ID of the received mail, the information specifying the storage location of the shared mail information, and the information specifying the storage location of the header section are associated as a record The email management method according to Appendix 10, including.

(Mode 12) In the step of storing the record, information in which the message ID, the information specifying the storage location of the shared mail information, and the information specifying the personal mail box are stored as the record , E-mail management method described in Supplementary Note 11.

(Form 13) A step of receiving a mail request, a step of acquiring the header portion from the second storage area corresponding to the mail request source when the mail request is received, and included in the acquired header portion Identifying the first storage area based on the received message ID, acquiring the shared mail information from the identified first storage area, the acquired header portion, and the acquired sharing The mail management method according to any one of Appendices 10 to 12, further comprising the steps of: combining the email information and creating an email; and transmitting the created email to the email request source. .

(Form 14) A step of receiving a mail deletion request, a step of specifying a storage location of a header portion to be deleted when the mail deletion request is received, and a step of specifying a header portion to be deleted, The header portion to be deleted The email management method according to appendix 13, wherein a storage location of the shared email information is specified based on a message ID included in.

(Mode 15) In the separating step, a step of acquiring a message ID from the header portion of the received mail, a step of determining whether the acquired message ID is stored in the message ID database, and If the acquired message ID is not stored in the message ID database, the message ID, information specifying the storage location of the shared mail information, and one of the header portions corresponding to the acquired message ID The method according to any one of Appendices 10 to 14, further comprising the step of creating the record associated with the corresponding information specifying the second storage area, and registering the created record in the message ID database. Mail management method described in one.

(Mode 16) In the separating step, when the acquired message ID is stored in the message ID database, a step of identifying the record corresponding to the acquired message ID, and corresponding to the message ID E-mail according to appendix 15, further comprising the step of adding, to the specified record, information specifying the second storage area corresponding to another destination different from the one destination in the header part. Management method.

(Form 17) In the step of separating, the step of storing the header portion acquired from the received mail and the shared mail information in the first storage area corresponding to the message ID of the received mail; The mail management method according to any one of appendices 10 to 16, further comprising the step of storing the header portion acquired from the received mail in the second storage area for each destination of the received mail.

(Form 18) In the step of separating, the step of storing the header portion acquired from the received mail and the shared mail information in the first storage area corresponding to the message ID of the received mail; The mail management method according to any one of appendices 10 to 17, further comprising the step of storing the message ID of the received mail in the second storage area for each destination of the received mail.

(Mode 19) The mail management program according to the third aspect is as described above.

Similar to the embodiment shown in the embodiment 1, the embodiment shown in the embodiment 19 can be developed into the embodiments shown in the embodiments 2 to 9.

The disclosure of the above-mentioned patent documents is incorporated herein by reference. Within the scope of the entire disclosure of the present invention (including the scope of the claims), modifications and adjustments of the embodiment are possible based on the fundamental technical concept of the invention. In addition, various combinations or selections of various disclosed elements (including each element of each claim, each element of each embodiment, each element of each drawing, etc.) are possible within the scope of the entire disclosure of the present invention. is there. That is, the present invention of course includes the entire disclosure including the scope of the claims, and various modifications and alterations that can be made by those skilled in the art according to the technical concept. In particular, with regard to the numerical ranges described herein, it should be understood that any numerical value or small range falling within the relevant range is specifically described even if it is not otherwise described. In the present application, functional means described as "means", such as "mail receiving means", "mail header deciphering means", "mail request accepting means", etc., are respectively represented as the relevant functional unit or the relevant functional part. be able to.

1, 10, 10a, 10b Mail server apparatus 2, 200 Mail receiving means 3, 300, 300a, 300b Mail header decoding means 4 First storage area 5 Second storage area 31, 41, 61 Shared mail information 32, 51 62, 301, 701, 4100, 4300 Header section 100 Other mail server 302, 702, 4101, 4301 Mail text 303, 703, 4102, 4302 Attached file 304 Message ID of header section
400 Message ID Database 401 Information 500 Correlating Message ID, Header Part, and Shared Mail Information Shared Mail Storage Unit 600 Personal Mail Box 700 Mail Request Accepting Means 800 Recipient Mail Software 3100, 3410, 3511 to 3513, 3700 Mail 3200, 3600 Mail software 3300 xxx.example.am mail server 3310 Destination mail server judgment function 3400 example.xxx.jp mail server 3501 kobe mailbox 3502 kyoto mailbox 3503 osaka mailbox 4000 mail server 4310 1 @ abc mailbox 4410 2 @ abc mailbox

Claims (10)

1. Mail receiving means for receiving email,
   Mail header decrypting means for separating the received mail into shared mail information including a mail text and a header portion when the mail receiving means receives the electronic mail;
   A first storage area,
   A second storage area that is different for each email destination,
   Is configured to include
   The mail header decrypting means stores the shared mail information of the received mail in the first storage area, and the header portion of the received mail in the second storage area for each destination of the received mail. Mail server device to store.
2. It further includes a message ID database storing, as a record, information in which the message ID of the received mail, the information specifying the storage location of the shared mail information, and the information specifying the storage location of the header section are associated. The mail server device according to claim 1, comprising:
3. The said message ID database stores the information which matched the said message ID, the information which specifies the storing place of the said shared mail information, and the information which specifies a personal mail box as said record. Mail server device.
4. And e-mail request receiving means for receiving the e-mail request.
   The mail request accepting means is
   When the mail request is received, the header unit is acquired from the second storage area corresponding to the mail request source,
   The first storage area is identified based on the message ID included in the acquired header portion, and the shared mail information is acquired from the identified first storage area.
   Combining the acquired header portion and the acquired shared mail information to create an e-mail;
   The mail server device according to any one of claims 1 to 3, wherein the created electronic mail is transmitted to the mail request source.
5. The mail request receiving means receives a mail deletion request,
   When the mail request receiving means receives the mail deletion request, the storage location of the header portion and the header portion to be deleted are specified based on the mail deletion request, and are included in the header portion to be deleted. The mail server device according to claim 4, wherein a storage location of the shared mail information is specified based on a message ID.
6. The mail header decrypting means is
   The message ID is acquired from the header portion of the received mail, and it is determined whether the acquired message ID is stored in the message ID database.
   If the acquired message ID is not stored in the message ID database, the message ID, information specifying the storage location of the shared mail information, and one of the header portions corresponding to the acquired message ID Creating the record associated with the information specifying the second storage area corresponding to
   The mail server device according to any one of claims 2 to 5, wherein the created record is registered in the message ID database.
7. The mail header decrypting means is
   If the acquired message ID is stored in the message ID database, the record corresponding to the acquired message ID is identified;
   7. The information according to claim 6, wherein information for specifying the second storage area corresponding to another destination different from the one destination among the header parts corresponding to the message ID is added to the specified record. Mail server device.
8. The mail header decrypting means is
   Storing the header portion acquired from the received mail and the shared mail information in the first storage area corresponding to the message ID of the received mail;
   The mail server device according to any one of claims 1 to 7, wherein the header section acquired from the received mail is stored in the second storage area for each destination of the received mail.
9. A first storage area,
   A second storage area that is different for each email destination,
   The mail server device configured to include
   Receiving emails;
   Separating the received mail into the shared mail information including the mail text and the header portion;
   In the separating step, the shared mail information of the received mail is stored in the first storage area corresponding to the message ID of the received mail, and the second storage area for each destination of the received mail is stored. And e-mail management method, storing the header part of the received e-mail.
10. A first storage area,
    A second storage area that is different for each email destination,
    A mail management program to be executed by a computer that controls a mail server configured to include
    The process of receiving an email,
    Allowing the computer to execute a process of separating the received e-mail, with the shared e-mail information including the e-mail text and the header portion;
    In the separation process, the shared mail information of the received mail is stored in the first storage area corresponding to the message ID of the received mail, and the second storage area for each destination of the received mail is stored. A mail management program which causes the computer to execute a process of storing the header portion of the received mail.

Images