JP5877751B2 - Program and mail system - Google Patents

Description

  The present invention relates to a program and a mail system.

  Conventionally, electronic mail has been used as a communication tool, and there is an MTA (Mail Transfer Agent) that accepts an electronic mail from a MUA (Mail User Agent) and delivers (distributes, transmits, and forwards) the electronic mail. To do.

  Here, the MUA is a client program used to send and receive e-mails at terminals on the Internet, and the MTA receives and delivers e-mails on the network via SMTP (Simple Mail Transfer Protocol). Refers to the server.

  FIGS. 16A and 16B are diagrams for explaining an e-mail transmission relay.

  The electronic mail M1 created by the terminal 210 is transmitted from the MUA 220 to an MTA that performs processing for delivering (distributing, transmitting, transferring) the electronic mail.

  The e-mail M1 created by the user specifying a plurality of destination addresses B1, B2, A2 has a plurality of envelope destinations (envelope To) B1, B2, A2 in the MUA 220 as shown in FIG. 16A, for example. One e-mail M2 is often sent to MTA1.

   An email envelope is an email address used when a server (MTA or MUA) delivers an email. In an SMTP session, a terminal (MUA) or a server (MTA) is connected to another server. An envelope destination (envelope To) and an envelope source (envelope From) to be transmitted are included.

   Usually, an e-mail is composed of an envelope and message data. The envelope is composed of envelope sender data and envelope destination data, and the MTA that receives the e-mail from the MUA performs processing for delivering the e-mail based on the envelope destination.

  When MTA1 (230) relays email to MTA2 (240), one email M2 having a plurality of envelope destinations B1, B2, and A2 has one email having envelope destinations B1, B2, and A2. May not be sent as. In other words, the electronic mail M3-1 of the envelope destination B1, the electronic mail M3-2 of the envelope destination B2, and the electronic mail M3-3 of the envelope destination A2 may be transmitted separately.

  Also, as shown in FIG. 16B, the MUA 220 sends the email M3-1 of the envelope destination B1, the email M3-2 of the envelope destination B2, and the email M3-3 of the envelope destination A2 to be transmitted apart. There is a case.

Japanese Patent Laid-Open No. 3-104345

  When delivering an e-mail with a plurality of destinations specified, if it is transmitted as a plurality of broadcast mails having different envelope destinations, for example, when encrypting an attached file, the e-mail M3-1 and e-mail Since the encrypted password for the attached file differs between M3-2 and e-mail M3-3, management on the sender side becomes complicated.

  For example, when archiving an e-mail, the e-mail M3-1, the e-mail M3-2, and the e-mail M3-3 are individually archived (copied). This can cause the storage capacity of the mail server to be compressed.

  Further, for example, when canceling (recognizing) or deleting an e-mail, the e-mail M3-1, the e-mail M3-2, and the e-mail M3-3 are individually designated to cancel the hold (approval) or delete the e-mail, respectively. Therefore, management on the sender side becomes complicated.

  The present invention has been made in view of the above-described problems. When the same sender delivers an e-mail having the same contents and specifying a plurality of destinations, a plurality of broadcast mails having different envelope destinations are unified and processed. To provide a possible program and mail system.

  (1) This application example is a program for a mail server that receives an e-mail and performs a given process, and an e-mail receiving unit that receives an e-mail transmitted from a sender, and the received e-mail The identification information generating unit that generates identification information based on information that does not depend on the communication path of the message data of the e-mail, and when a given e-mail and another e-mail have the same identification information, Mail unification that performs a mail unifying process for creating an envelope including an envelope destination of a given e-mail and an envelope destination of the other e-mail and message data of the given e-mail or the other e-mail The present invention relates to a processing unit and a program that causes a computer to function. The application example also relates to an information storage medium storing the program.

The application example is a mail system that receives an email and performs a given process,
An e-mail receiving unit that accepts an e-mail transmitted from a sender, an identification information generating unit that generates identification information for the received e-mail based on information that does not depend on a communication path of message data of the e-mail, and a given And other emails having the same identification information, the envelope destination of the given email and the envelope containing the envelope destination of the other email, the given email or the other The present invention relates to a mail system including a mail unification processing unit for performing a mail unification process for creating an e-mail including message data of the e-mail.

  According to this application example, there is provided a program and a mail system capable of unifying and processing a plurality of broadcast mails having different envelope destinations when the same sender delivers an electronic mail having the same contents and specifying a plurality of destinations. Can be provided.

  (2) Also, in the program, information storage medium, and mail system of this application example, the mail unifying processing unit sets a reception waiting time limit when receiving a given e-mail and sets when receiving the given e-mail If the other e-mail having the same identification information as the given e-mail is received within the reception waiting period, mail unifying processing of the given e-mail and the other e-mail may be performed. Good.

  (3) Further, the program, information storage medium, and mail system of this application example encrypt the attached file of the electronic mail, and further cause the computer to function as an encryption processing unit that generates the encrypted file and the password. The encryption processing unit is generated by the encryption process of the other e-mail when there is an attached file already encrypted in another e-mail having the same identification information as the given e-mail. The attached file of the given electronic mail may be encrypted using a password.

  The process of encrypting the attached file of the e-mail may be performed after the reception waiting period of each e-mail. According to this application example, all broadcast mails are not centralized by the mail unification process, and even if multiple broadcast mails exist, the same password is used to encrypt the broadcast mail having the same hash value. Can be

  (4) Further, the program, information storage medium, and mail system of this application example further cause the computer to function as a virus check processing unit that performs a virus check process on an attached file of an e-mail, and the virus check processing unit If there is a virus check of the attached file in another e-mail having the same identification information as the e-mail, the virus check process for the given e-mail may be omitted.

  The virus check process for electronic mail may be performed after the deadline for receiving each electronic mail. According to this application example, even if all broadcast mails are not centralized by the mail centralization process and there are a plurality of broadcast mails, the virus check process for a plurality of broadcast mails having the same hash value is 1 Since it only takes time, the processing load on the server can be reduced.

  (5) Further, the program, the information storage medium, and the mail system of the application example further cause the computer to function as a hold processing unit that holds an email and distributes or deletes the email that is held according to a predetermined condition. The hold processing unit, when there is a delivery process or a deletion process for another e-mail having the same identification information as the given e-mail, the given e-mail and the other e-mail The same processing may be performed.

  The e-mail hold process may be performed after the deadline for receiving each e-mail. According to this application example, all broadcast mails are not centralized by the mail unification process, and even when multiple broadcast mails exist in the mail management area, for the broadcast mails having the same hash value, The same processing (hold release and deletion) can be performed.

  (6) Further, the program, the information storage medium, and the mail system of this application example further cause the computer to function as an archive processing unit that performs archiving processing of electronic mail, and the archive processing unit has the same identification as a given electronic mail. If there is another archived e-mail with information that has been archived, the given e-mail is not copied, and the other e-mail with the envelope destination of the given e-mail stored in the archive area is not used. It may be added to the mail envelope destination.

  The email archiving process may be performed after the deadline for receiving each email.

  According to this application example, even when all broadcast mails are not centralized by the mail centralization process and a plurality of broadcast mails exist in the mail management area, a copy of a plurality of broadcast mails having the same hash value is performed. Therefore, the amount of data stored in the storage area of the server can be reduced and the storage area can be used effectively.

The example of the functional block of the server of this embodiment. The figure which shows the structure of the email M1 which the user produced. The figure which shows the structure of the email M2 which MUA produces. Example of sibling mail with different envelopes. FIGS. 5A to 5C are diagrams for explaining mail unification processing. FIGS. 6A to 6C are diagrams for explaining the reception waiting table. The figure which shows the example of the email by which the centralization process was carried out. The flowchart which shows the flow of an identification information generation process and a mail unification process. The flowchart which shows the flow of a rule determination process. The flowchart which shows the flow of the encryption process of a file. The flowchart which shows the flow of the hold process of an email. The flowchart which shows the flow of the virus check process of an email. The flowchart which shows the flow of the archive process of an email. The figure for demonstrating the operation example of the server carrying the mail system of this embodiment. The example of application of the mail system of this embodiment. FIGS. 16A and 16B are diagrams for explaining an e-mail transmission relay.

  Hereinafter, this embodiment will be described. In addition, this embodiment demonstrated below does not unduly limit the content of this invention described in the claim. In addition, all the configurations described in the present embodiment are not necessarily essential configuration requirements of the present invention.

1. Configuration FIG. 1 is an example of a functional block diagram of a server (an example of a mail system) 10 according to the present embodiment. Note that the server 10 according to the present embodiment does not have to include all the units illustrated in FIG. 1 and may have a configuration in which some of the units are omitted.

  The storage unit 170 serves as a work area for the processing unit 100 and the like. The storage unit 170 stores a program for causing the computer to function as each unit of the present embodiment (a program for causing the computer to execute processing of each unit). Can be remembered.

  The storage unit 170 stores programs, data, and the like, and functions thereof are RAM (VRAM), optical disk (CD, DVD), magneto-optical disk (MO), magnetic disk, hard disk, magnetic tape, or memory ( It can be realized by a computer-readable information storage medium such as a ROM).

  The storage unit 170 of this embodiment includes a reception waiting table 171, an e-mail management area 172, a processing history storage area 173, a rule storage area 174, an e-mail archive area 175, a password storage area, and various DBs (DB is an abbreviation of a database). The same shall apply hereinafter.

  The processing unit 100 performs various processes of the present embodiment based on a program (data) stored in the storage unit 170.

The processing unit 100 (processor) performs various processes using the main storage unit in the storage unit 170 as a work area. The functions of the processing unit 100 can be realized by hardware such as various processors (CPU, DSP, etc.) and programs.

  The processing unit 100 includes an e-mail processing unit (MTA) 110, a web processing unit 120, and a database processing unit 130.

  The e-mail processing unit 110 receives and delivers e-mail over the network via SMTP. The e-mail processing unit 110 of this embodiment includes an e-mail transmission unit 111, an e-mail reception unit 112, an analysis unit 113, an identification information generation unit 114, a mail unification processing unit 115, an encryption processing unit 116, a hold processing unit 117, A virus check processing unit 118 and an archive processing unit 119 are included.

  The e-mail receiving unit 112 performs a process of receiving an e-mail which is transmitted from the sender and designated an envelope destination by the MUA 22 of the terminal 20.

  The analysis unit 113 performs processing for analyzing the received electronic mail. For example, an envelope destination, an envelope sender, a message header, and a body part of a message body are analyzed. For example, a domain is extracted from the envelope destination, and To, Cc, Bcc, and Subject are extracted from the message header. Also, a process of extracting the body text from the body part of the message is performed.

  The identification information generation unit 114 generates identification information for the received electronic mail based on information that does not depend on the communication path of the message data of the electronic mail. The identification information only needs to be one-to-one correspondence with the email, and may be a hash value, for example. The envelope of the email is an email address used when the server delivers the email. In the SMTP session, the terminal (MUA) transmits to the server, the envelope destination (envelope To), and the envelope transmission. Includes the original (envelope From). The envelope destination of e-mail means a destination (envelope To) specified by the envelope.

  For received electronic mail, identification information may be generated based on header information that does not depend on the communication path of the electronic mail. Further, for the received electronic mail, identification information may be generated based on header information and text information that do not depend on the communication path of the electronic mail. For the received electronic mail, identification information may be generated using message data including at least a message ID.

  When the given email and other emails have the same identification information, the mail unifying processing unit 115 includes an envelope including the envelope destination of the given email and the envelope destination of the other email, A mail unifying process for creating an e-mail including message data of the given e-mail or the other e-mail is performed. The e-mail message data includes header information, e-mail text information, and the like.

  The mail centralization process may be, for example, adding an envelope destination of a given email to an envelope destination of another email to make the given email and the other email into one email.

  The mail unifying processing unit 115 sets a reception waiting period when receiving a given e-mail, and has the same identification information as the given e-mail within the reception waiting period set when receiving the given e-mail When the other electronic mail is received, mail unification processing of the given electronic mail and the other mail may be performed.

  The encryption processing unit 116 performs encryption processing of the attached file of the e-mail, and generates an encrypted file and a password. The encryption processing unit 116, when there is an attached file that has already been encrypted in another email having the same identification information as the given email, is generated by the encryption processing of the other email The attached file of the given electronic mail may be encrypted using a password. The process of encrypting the attached file of the e-mail may be performed after the reception waiting period of each e-mail.

  The virus check processing unit 118 performs a virus check process on the attached file of the e-mail. The virus check processing unit 118 omits the virus check process for the given e-mail when there is a virus check for the attached file in another e-mail having the same identification information as the given e-mail. May be. The virus check process for electronic mail may be performed after the deadline for receiving each electronic mail.

  The hold processing unit 117 holds the e-mail, and delivers or deletes the hold e-mail according to a predetermined condition. The hold processing unit 117, when there is another email having the same identification information as the given email that has undergone delivery processing or deletion processing, the given email to the other email The same processing may be performed.

  The hold processing unit 117 may perform a process of delivering or deleting the held electronic mail based on a predetermined condition. For example, the hold processing unit 117 may perform a process of delivering a hold e-mail when receiving a “delivery instruction for delivering hold mail” transmitted from the terminal 20. Further, the hold processing unit 117 may perform a process of deleting the hold mail when receiving the “deletion instruction to delete the hold mail” transmitted from the terminal 20. Note that the hold processing unit 117 does not receive a delivery / deletion instruction from the terminal 20 and automatically delivers the hold mail or automatically deletes the hold mail when a certain period has elapsed. Processing may be performed.

  The e-mail hold process may be performed after the deadline for receiving each e-mail.

  The archive processing unit 119 performs e-mail archive processing. The archive processing unit 119 does not copy the given e-mail when another e-mail having the same identification information as the given e-mail has been archived, and does not copy the given e-mail. A mail envelope destination may be added to the envelope destination of the other electronic mail stored in the archive area. The archiving process of the attached file of the e-mail may be performed after the reception waiting period of each e-mail.

The Web processing unit 120 transmits HTML (Hyper Text Markup) in response to a request from client software such as the Web browser 21 installed in the terminal 20 through HTTP (Hypertext Transfer Protocol).
Language) A process of transmitting (providing) data such as a document and an image, and a process of receiving data received by the Web browser of the terminal.

  The administrator UI unit 121 (UI is an abbreviation of user interface; the same applies hereinafter) performs a process of transmitting management setting data and the like to the terminal 20 in response to an access request from the Web browser 21 of the terminal 20. A process of receiving rule setting information and each rule score in association with each rule (each rule identification information) transmitted from the terminal 20 is performed.

  In response to a request from the Web browser 21 of the terminal 20, the user UI unit 122 stores a Web page of a hold e-mail corresponding to the logged-in user (Web of a hold e-mail from which the user's e-mail address is sent). Page) is sent (provided). In addition, the user UI unit 122 performs a process of transmitting a Web page for receiving an instruction to transmit / delete a pending email in response to a request from the Web browser 21 of the terminal 20. The user UI unit 122 performs processing of receiving a delivery instruction and a deletion instruction for a suspended electronic mail transmitted from the terminal 20.

  The database processing unit 130 performs processing for registering, updating, and deleting data stored in the database. For example, the database processing unit 130 performs a process of updating the database based on data received from the terminal in the administrator UI unit 121 and the user UI unit 122.

  Note that the e-mail processing unit 110, the web processing unit 120, and the database processing unit 130 may be executed by one device, or may be distributed to different devices and executed in accordance with the use of processing. Good.

2. Configuration of E-mail As shown in FIG. 16A, the MUA creates an e-mail M2 based on the e-mail M1 created on the user terminal and transmits it to the MTA. Here, MUA is a client program used to send and receive e-mail at a terminal on the Internet.

  2 and 3 are diagrams for explaining the configuration of an email M1 created by the user and an email M2 created by the MUA based on the email M1.

  In FIG. 2, reference numeral 300 indicates that the user of the source address “A1” has the destination address “B1”, “B2”, the BCC address “A2”, the subject “C1”, the text “Hello!”, And the email of the attached file D. A configuration example of an e-mail M1 created by the user when M1 is sent is shown.

  The user creates the From (source address) 321, To (destination address) 322, BCC (Blind Carbon Copy address) 325, Subject (subject) 323, body 332, and attached file 334. BCC is one of e-mail functions in which an e-mail having the same content is transmitted to the address entered in this list. The original recipient To (destination address) 322 does not know that the electronic mail with the same content has been transferred to the BCC.

  The MUA does not send the email M1 created by the user to the MTA as it is, but transmits the email M2 created based on the email M1. MTA refers to a server that receives and delivers electronic mail over a network via SMTP (Simple Mail Transfer Protocol).

  Reference numeral 300 in FIG. 3 shows an example of the configuration of an e-mail M2 created by the MUA. The same items as those in the electronic mail M1 in FIG. Normally, an e-mail is composed of an envelope 310 and message data (a header 320 and a body text (attached file) 330). The envelope 310 includes data of an envelope source 312 and an envelope destination 314, and the MTA that receives the email from the MUA performs a process of delivering the email based on the envelope destination.

  The envelope source 312 is created based on the From (source address) 321 in FIG. 2 and is “A1”. The envelope destination 314 is created based on To (destination address) 322 in FIG. 2 and BCC (Blind Carbon Copy address) 325 in FIG. 2, and is “B1”, “B2”, and “A2”.

  The message data (header 320 and body etc. (attached file) 330) of the e-mail M2 is generated based on each item of the e-mail M1 in FIG. 2, but in the e-mail M2, the BCC (Blind Carbon Copy address) in FIG. 325 is used only as an envelope destination 314 and is not included in the message data (header 320).

  As the header 320, the MUA adds a Date (e-mail creation time) 324 and a message ID 335. The message ID 335 is information uniquely given to an e-mail when the MUA creates an e-mail based on user input information, and serves as header information constituting message data.

  4A to 4C are diagrams showing examples of sibling mails with different envelopes.

  As shown in FIG. 16, the electronic mail M1 having a plurality of destinations includes an electronic mail M3-1 having an envelope destination B1, an electronic mail M3-2 having an envelope destination B2, and an electronic mail M3-3 having an envelope destination A2. As described above, an example of a plurality of e-mails having different envelope destinations will be described.

  In FIG. 4A, 300'-1 shows a configuration example of the email M3-1 of the envelope destination "B1". Items corresponding to the e-mail M1 in FIG. 2 and the e-mail M2 in FIG. 3 are given corresponding numbers. 310'-1 is an envelope, 320'-1 is a header, and 330'-1 is a body (note that the header and body are called message data).

  The contents of each item of the header 320′-1 and the body 330′-1 of the e-mail M3-1 are the same as those of the e-mail M2 in FIG. 3, but the envelope destination 314′-1 is only “B1”. ing.

  In FIG. 4B, 300 ′-2 indicates a configuration example of the email M <b> 3-2 of the envelope destination “B <b> 2”. Items corresponding to the e-mail M3-1 in FIG. The contents of the items of the header 320′-2 and the body 330′-2 of the email M3-2 are the same as those of the email M2 in FIG. 3 and the email M3-1 in FIG. 314′-2 is only “B2”.

  In FIG. 4C, 300'-3 shows an example of the configuration of the email M3-3 of the envelope destination "A1". Items corresponding to the electronic mails M3-1 and M3-2 in FIGS. 4A and 4B are given corresponding numbers. The contents of each item of the header 320′-3 and the text 330′-3 of the e-mail M3-3 are the e-mail M2 in FIG. 3 and the e-mails M3-1 and M3-2 in FIGS. Similarly, the envelope destination 314′-3 is only “A2”.

3. Operation Example of Mail Server FIG. 14 is a diagram for explaining an operation example of a server equipped with the mail system of this embodiment. Components similar to those in FIG. 1 are denoted by the same reference numerals.

  The server according to the present embodiment has an MTA function for receiving an electronic mail including an envelope destination, an envelope source, and a message used for delivery processing and delivering the electronic mail.

  The MTA delivers an e-mail through a process of delivering the received e-mail to another MTA via SMTP, or a local delivery agent MDA for delivering to a user who has an account in the same system where the mail server operates. This includes processing for delivery to (Mail Delivery Agent) and delivery to a user who has an account in the same system where the mail server operates without going through MDA.

  Hereinafter, the same content e-mail transmitted by the same sender with a plurality of destinations designated as e-mails M3-1 to M3-3 in FIGS. 4A to 4C is referred to as a broadcast mail.

4). Identification Information Generation Processing In this embodiment, a hash value of a received electronic mail is generated and broadcast mail is determined using the hash value. The identification information generation unit 114 generates a hash value (an example of identification information) of the email received by the email reception unit 112. The identification information generation unit 114 may generate a hash value using message data (either header information or email body information) that does not depend on the communication path of the received email.

  The hash value is a value obtained based on a hash function (checksum, check digit, fingerprint, etc.). For example, the input key of the hash function is at least one piece of message data (header information, electronic mail body information) that does not depend on the communication path of the electronic mail, and the output value of the hash function is the hash value. Since this hash value is the same value in the broadcast mail, it is information for identifying (specifying) the broadcast mail.

  For example, the Date 324′-1, the header destination 322′-1, the header source 321′-1, and the message ID 335′-1 in FIG. 4A are header information that does not depend on the communication path of the email. The hash value may be obtained using these as input keys of the hash function. Alternatively, the hash value may be obtained using these and the body 332'-1 of the e-mail in FIG. 4A as the input key of the hash function. A hash value may be obtained as an input key of the hash function including the attached file 334'-1.

  Since E-mails M3-1 to M3-3 all have the same Date, header destination, header source, message ID, body, and attached file, the generated hash values are also the same.

5. Mail Unification Processing The mail unification processing unit 115 waits to receive the received e-mail and its hash value when there is no other e-mail (broadcast mail) having the same hash value as the received e-mail in the reception waiting table 171. Store in table 171.

  When another e-mail (broadcast mail) having the same hash value as the received e-mail is in the reception waiting table 171, the received e-mail is different from other e-mails having the same hash value in the reception waiting table 171. Perform mail unification processing.

  If the reception wait table 171 does not have the same hash value, a reception wait end time is set when the e-mail is received, stored together with the generated hash value in the reception wait table 171 and held until the reception wait end time. Good.

  When the e-mail in the reception waiting table passes the reception waiting end time, the e-mail is deleted from the reception waiting table and stored in the mail management area 172. Therefore, when another e-mail having the same hash value as the e-mail is newly received while the e-mail is in the reception waiting table, the e-mail in the reception waiting table and the other e-mail are unified. It becomes mail. In addition, when another e-mail having the same hash value as the e-mail is newly received after the e-mail is deleted from the reception waiting table, the e-mail and the other newly received e-mail are unified at this stage. Instead, they are stored in the mail management area 172 as e-mails having different envelope destinations.

  FIGS. 5A to 5C are diagrams for explaining the mail unification processing.

  The e-mail M3-1 is an e-mail with an envelope destination “B1”, the e-mail M3-2 is an envelope destination “B2”, and the e-mail M3-3 is an e-mail with an envelope destination “A1”. These are mails (broadcast mails) having the same message data (header and body). Since the electronic mails M3-1, M3-2, and M3-3 may arrive via different communication paths, there may be a time lag in the reception time as shown in FIGS.

  For example, as shown in FIG. 5A, the electronic mail M3-1 is received at time t1, the electronic mail M3-2 is received at time t2, the electronic mail M3-3 is received at time t3, and the electronic mail M3-1 is received. It is assumed that the reception waiting end time (T1) at which the reception waiting time limit set at time ends is time t4.

  In such a case, the e-mails M3-1, M3-2, and M3-3 received by the time t4 that is the reception waiting end time (T1) have the same hash value, and thus are unified and the envelope destination “B1”. One e-mail M2 of “B2” and “A2” is obtained. When the time t4 has passed, the e-mail M2 is deleted from the reception waiting table 171 and stored in the mail management area 172 (see 410).

  Further, for example, as shown in FIG. 5B, the electronic mail M3-1 is received at time t1, the electronic mail M3-2 is received at time t2, the electronic mail M3-3 is received at time t4, and the electronic mail M3-1 is received. The reception waiting end time (T1) at which the reception waiting time limit set at the time of reception ends is time t3, and the reception waiting end time (T3) at which the reception waiting time limit set at the time of receiving the e-mail M3-3 is time t5. And

  In such a case, the e-mails M3-1 and M3-2 received by the time t3 which is the reception waiting end time (T1) have the same hash value and are unified, and the envelope destinations “B1” and “B2”. One e-mail M3-1 + M3-2 is obtained. When the time t3 has passed, the e-mail M3-1 + M3-2 is deleted from the reception waiting table 171 and stored in the mail management area 172 (see 420).

  At the time t4 when the e-mail M3-3 is received, there is no e-mail having the same hash value in the reception waiting table 171. Therefore, a reception waiting time limit is set when the e-mail M3-3 is received, and the reception waiting end time ( It is held in the reception waiting table 171 until time t5 which is T3). When the time t5 has passed, the e-mail M3-3 is deleted from the reception waiting table 171 and stored in the mail management area 172 (see 430).

  Further, for example, as shown in FIG. 5C, the electronic mail M3-1 is received at time t1, the electronic mail M3-2 is received at time t3, the electronic mail M3-3 is received at time t5, and the electronic mail M3-1 is received. The reception wait end time (T1) at which the reception wait time limit set at the time of reception ends is t2, the reception wait end time (T2) at which the reception wait time limit set at the time of reception of the electronic mail M3-2 is t4, and the electronic mail M3 -3 It is assumed that the reception wait end time (T3) at which the reception wait time limit set at the time of reception ends is t6.

  At the time t1 when the e-mail M3-1 is received, there is no e-mail having the same hash value as that of the e-mail M3-1 in the reception waiting table 171. Therefore, a reception waiting time limit is set when the e-mail M3-1 is received, It is held in the reception waiting table 171 until time t2, which is the reception waiting end time (T1). When the time t2 has passed, the e-mail M3-1 is deleted from the reception waiting table 171 and stored in the mail management area 172 (see 440).

  At the time t3 when the e-mail M3-2 is received, there is no e-mail having the same hash value as the e-mail M3-2 in the reception waiting table 171. Therefore, a reception waiting time limit is set when the e-mail M3-2 is received. The data is held in the reception waiting table 171 until time t4 which is the reception waiting end time (T2). When the time t4 has passed, the e-mail M3-2 is deleted from the reception waiting table 171 and stored in the mail management area 172 (see 450).

  At the time t5 when the e-mail M3-3 is received, there is no e-mail having the same hash value as the e-mail M3-3 in the reception waiting table 171. Therefore, a reception waiting time limit is set when the e-mail M3-3 is received. The data is held in the reception waiting table 171 until time t6 which is the reception waiting end time (T3). When the time t6 has passed, the e-mail M3-3 is deleted from the reception waiting table 171 and stored in the mail management area 172 (see 460).

  6A to 6C are diagrams for explaining the reception waiting table.

  The reception wait table 400 holds an e-mail 430, a hash value 410 of the e-mail, and a reception wait end time 420 for ending the reception of another e-mail having the same hash value as the hash value of the e-mail. The The reception waiting end time may be set based on the time when the electronic mail is received and the reception waiting time. The reception waiting time limit may be given as a relative time limit, for example, x seconds after reception.

  For example, assume that 400 in FIG. 6A is in the state of the reception waiting table 171 at time t1 in FIG. 5A, and the hash value of the email M3-1 received at time t1 is “54667099” (FIG. 6). 6 (A) 474). In such a case, the reception waiting table does not have the same hash value as the e-mail M 3-1, so the reception waiting end time h 3 is set in the e-mail M 3-1 and stored in the reception waiting table 171. If the reception waiting time limit is x seconds after reception, the reception waiting end time h3 = t1 + x is given. Reference numeral 472 in FIG. 6B shows a state in which the e-mail M3-1 is held in the reception waiting table.

  6B is set to the state of the reception waiting table 171 at time t2 in FIG. 5A, for example, and the hash value of the e-mail M3-2 received at time t2 is “54667099” (FIG. 6). 6 (B) 476). In such a case, since there is an e-mail M3-1 having the same hash value as the e-mail M3-2 in the reception waiting table (see 472 in FIG. 6B), the e-mail M3-2 is stored in the reception waiting table. The envelope destination “B2” of the e-mail M3-2 is added to the envelope destination “B1” of the e-mail M3-1 having the same hash value that is already stored in the reception waiting table, and the envelope destination is “ B1 ”and“ B2 ”emails M3-1 + M3-2 (see 470 in FIG. 6C). Note that the message data (header and body) of the e-mail M3-1 + M3-2 is the same as that of the e-mail M3-1 and the e-mail M3-2.

  FIG. 7 is a diagram illustrating an example of the electronic mail subjected to the centralization process. Reference numeral 300'-4 denotes a configuration example of an e-mail M3-1 + M3-2 in which the e-mails M3-1 and M3-2 are unified. Items corresponding to the e-mail M3-1 in FIG. 310'-4 is an envelope, and 320'-4 and 330'-4 are message data (header 320'-4, text 330'-4). The contents of the items of the header 320'-4 and the text 330'-4 of the e-mail M3-1 + M3-2 are the same as those of the e-mail M3-1 and the e-mail M3-2 in FIG.

  The envelope destination 314′-4 of the email M3-1 + M3-2 is “B1” “B2” obtained by adding the envelope destination “B2” of the email M3-2 to the envelope destination “B1” of the email M3-1. It has become.

  FIG. 8 is a flowchart showing a flow of identification information generation processing and mail unification processing.

  In an e-mail waiting state (S1), when an e-mail is received (YES in S2), the “Date”, “from”, “To”, and “Message-ID” mail header (H) are received from the received e-mail. Is extracted (S3). Further, the body (B) of the received electronic mail is extracted (S4). Then, a hash value hash (H + B) is generated from the mail header (H) and the body (B) (S5). Then, it is determined whether or not the same hash value exists in the reception waiting table (S6). If it exists (YES in S6), the “RECPT TO (envelope destination)” of the received electronic mail is stored in the reception waiting table. It adds to the envelope destination of the electronic mail of the same hash value (S7). Then, the reception waiting end time (T) of the electronic mail having the same hash value in the reception waiting table may be updated (S8). Since this process is optional, it does not have to be updated. If the same hash value does not exist in the reception waiting table (NO in S6), the received electronic mail, the reception waiting end time (T), and the hash value are stored in the reception waiting table (S9).

  Returning to FIG. 14, the processing of the e-mail stored in the mail management area 172 will be described. As described above, the e-mail held in the reception waiting table 171 is stored in the mail management area 172 when the reception end time has passed.

6). Rule determination processing The rule determination processing unit 142 determines a rule (type of processing to be performed on the email) set in the email based on the rule information stored in the rule storage area. The type of processing performed on the e-mail may be, for example, encryption processing, archive processing, virus check processing, hold processing, or the like. The user may be able to set rules for the e-mail by e-mail setting means 180 provided by a web browser or the like.

  FIG. 9 is a flowchart showing the flow of the rule determination process.

  The reception waiting table is read (S11), and if there is an email with the reception waiting end time (T) <the current time (YES in S12), the email and the hash value are stored in the mail storage area (S13), The rule is deleted from the reception waiting table (S14), and the rule set for the e-mail is determined (S15). Then, processing corresponding to the determined rule is executed (S16).

7). Attaching file encryption processing When a rule for performing attachment file encryption processing is set for a given e-mail stored in the mail management area, the encryption processing unit 116 The e-mail is encrypted and the password is stored in the password storage area 176.

  FIG. 10 is a flowchart showing the flow of file encryption processing.

  If there is an attached file in the processing target e-mail (YES in S21), the following processing is performed.

  If there is a password with the same hash value in the password storage area (YES in S22), the password is acquired from the password storage area (S25), and the attached file of the processing target e-mail is encrypted with a password using the acquired password. The file is converted into a converted file and attached again (S26).

  If there is no password with the same hash value in the password storage area (NO in S22), a password is generated (S23), and the generated password and hash value are stored in the password storage area (S24). Then, using the generated password, the attachment file of the processing target e-mail is converted into an encrypted file with a password and attached again (S26).

  According to the present embodiment, as shown in FIGS. 5B and 5C, even if all broadcast mails are not centralized by the mail centralization process and a plurality of broadcast mails exist in the mail management area, they are the same. A broadcast mail having a hash value can be encrypted with the same password.

8). On-hold processing When a rule for performing a hold process is set for a given electronic mail stored in the mail management area, the hold processing unit 117 performs a hold process on the given electronic mail.

  FIG. 11 is a flowchart showing the flow of the e-mail hold process.

  The hold processing unit 117 performs hold processing for holding the e-mail for a predetermined period, and gives a hold release instruction to the given hold mail from the user terminal or the like (including the approval instruction, the approved e-mail is released from hold) 194 When a deletion instruction 196 is received, hold release processing and deletion processing for a given hold mail are performed.

  If the processing history storage area has a processing history having the same hash value as that of the given suspended mail (YES in S31), the same processing as that of other suspended mail having the same hash value is executed (S32). For example, if there is a hold release processing history for other hold mails with the same hash value, the hold release process is performed for the given hold mail, and if there is a deletion history for other hold mails with the same hash value, the given Delete the pending mail. If there is no processing history having the same hash value as the given suspended mail in the processing history storage area (NO in S31), the processing instructed to the given suspended mail is executed (S33), and the history of the executed processing Are stored in the processing history storage area together with the hash value of the given suspended mail (S34).

  According to the present embodiment, as shown in FIGS. 5B and 5C, even if all broadcast mails are not centralized by the mail centralization process and a plurality of broadcast mails exist in the mail management area, they are the same. The same processing (hold release and deletion) can be performed on a broadcast mail having a hash value.

9. Virus Check Processing When a rule for performing virus check processing is set for a given e-mail stored in the mail management area, the virus check processing unit 118 performs virus check processing on the given e-mail. I do.

  FIG. 12 is a flowchart showing the flow of the email virus check process.

  If there is no virus check process history with the same hash value in the process history storage area (NO in S41), the virus check process is executed (S42), and the virus check process execution history is stored in the process history storage area together with the hash value. (S43).

  According to the present embodiment, as shown in FIGS. 5B and 5C, even if all broadcast mails are not centralized by the mail centralization process and a plurality of broadcast mails exist in the mail management area, they are the same. Since a virus check process for a plurality of broadcast mails having hash values is only required once, the processing load on the server can be reduced.

10. Archive Processing When a rule for performing archive processing is set for a given electronic mail stored in the mail management area, the archive processing unit 119 performs archive processing on the given electronic mail and performs mail archiving. Store in area 175.

  FIG. 13 is a flowchart showing a flow of e-mail archive processing.

  If there is an archive processing history having the same hash value as the given electronic mail in the processing history storage area (YES in S51), the “RECPT TO (envelope destination) of the electronic mail is stored in the electronic mail envelope stored in the mail archive area. ) ”Is added (S52).

  If there is no archive processing history with the same hash value in the processing history storage area (NO in S51), a copy of the e-mail is stored in the mail archive area (S53), and the history of the executed archive processing is processed together with the hash value. Store in the history storage area (S54).

  According to the present embodiment, as shown in FIGS. 5B and 5C, even if all broadcast mails are not centralized by the mail centralization process and a plurality of broadcast mails exist in the mail management area, they are the same. Since only one copy is required for a plurality of broadcast mails having hash values, the amount of data stored in the storage area of the server can be reduced and the storage area can be used effectively.

11. Application Example of Mail System FIG. 15 is a diagram for explaining an application example of the mail system of the present embodiment.

  The mail system of this embodiment may be implemented in the transmission mail server 700. In this way, the broadcast mail transmitted by the user is centralized in the transmission mail server, and the virus check 186, the ZIP encryption 184 of the attached file, the email archive 182, and the suspension email release / deletion 188 Can be centralized and managed.

  Further, the mail system of this embodiment may be mounted on the reception mail server 800. In this way, the broadcast mail received by a plurality of users is centralized in the receiving mail server, and the virus check 186, the email archive 182 and the hold mail release / deletion 188 can be centrally managed. it can.

12 User Interface Since the server of this embodiment uses a Web server together, the following information is transmitted to the terminal through the HTTP protocol in response to a request from the Web browser of the terminal, and input from the administrator or the user. Information can be received, rules can be set, pending email processing, DB update processing, and the like can be performed.

(1) UI for administrators
Based on the input from the administrator, the manager UI performs score setting for each rule, addition / deletion / update processing of the customer DB and employee DB, management of the action history DB, and the like.

  Based on the input from the administrator, the administrator UI enables / disables rules, sets thresholds (automatic delivery threshold, automatic deletion threshold), edits notification emails, You can enable / disable notification hold processing.

  Note that only the administrator is authorized to access the Web page (URL) of the administrator UI. In other words, since only the administrator can set rules and the like, it is possible to perform an e-mail hold process based on a unified rule.

(2) User UI
In the user UI, in response to a request from a web browser based on an input from a user registered in the employee DB, a process of transmitting a web page of an electronic mail held by the user himself / herself to a user terminal is performed. Further, the user UI can accept a delivery / deletion action instruction for a hold electronic mail from the user, and deliver / delete the hold electronic mail. In addition, in response to a request from the Web browser based on an input from the user, processing for storing a history of the action of the held electronic mail executed is performed. Also, the user UI performs new registration of a company name, signature editing, and password change processing at login based on input from the user.

  The present invention is not limited to the embodiments and specific examples described above, and various modifications can be made. For example, the present invention includes substantially the same configuration (for example, a configuration having the same function, method and result, or a configuration having the same purpose and effect) as the configuration described in the embodiment. In addition, the invention includes a configuration in which a non-essential part of the configuration described in the embodiment is replaced. In addition, the present invention includes a configuration that exhibits the same operational effects as the configuration described in the embodiment or a configuration that can achieve the same object. In addition, the invention includes a configuration in which a known technique is added to the configuration described in the embodiment.

10 server, 20 terminal, 21 Web browser, 22 MUA, 100 processing unit, 110 e-mail processing unit (MTA), 111 e-mail transmission unit, 112 e-mail receiving unit, 113 analysis unit, 114 identification information generation unit, 115 e-mail Centralized processing unit, 116 Encryption processing unit, 117 Hold processing unit, 118 Virus check processing unit, 119 Archive processing unit, 120 Web processing unit, 121 Administrator UI unit, 122 User UI unit, 130 Database processing unit, 170 Storage unit, 171 reception waiting table, 172 mail management area, 173 processing history storage area, 174 rule storage area, 175 mail archive area, 176 password storage area, 178 various DBs

Claims (7)

A program for a mail server that receives an email and performs a given process,
An email receiver that accepts email sent from the sender,
An identification information generating unit that generates identification information for identifying a broadcast mail based on predetermined information included in the message data of the e-mail about the received e-mail;
If a given email and another email have the same identification information, an envelope containing the envelope destination of the given email and the envelope destination of the other email, and the given email or A program that causes a computer to function as a mail unifying processing unit that performs a mail unifying process for creating an e-mail including message data of the other e-mail. In claim 1,
The mail centralization processing unit
A reception waiting period is set when a given e-mail is received, and the other e-mail having the same identification information as the given e-mail is received within the reception waiting period set when the given e-mail is received If so, a program for performing mail unification processing of the given electronic mail and the other electronic mail. In claim 1 or 2,
An encryption processing unit that encrypts an email attachment and generates an encrypted file and a password, and further causes the computer to function,
The encryption processing unit
When there is another e-mail having the same identification information as that of the given e-mail, the attached file has been encrypted, the password generated by the encryption process of the other e-mail is used. A program that encrypts email attachments. In any one of Claims 1 thru | or 3,
A virus check processing unit that performs virus check processing of email attachments, and further functions the computer,
The virus check processing unit
A program that omits the virus check process for a given e-mail when another e-mail having the same identification information as the given e-mail has a virus check on the attached file. In any one of Claims 1 thru | or 4,
Hold the e-mail and let the computer function as a hold processing unit that delivers or deletes the held e-mail according to a predetermined condition,
The hold processing unit
A program for performing the same processing as the other e-mail on the given e-mail when there is a delivery process or a deletion process on another e-mail having the same identification information as the given e-mail . In any one of Claims 1 thru | or 5,
As an archive processing unit that performs email archiving, let the computer function further,
The archive processing unit
If there is another archived email with the same identification information as the given email, do not copy the given email and archive the envelope destination of the given email A program to be added to the envelope destination of the other e-mail stored in the area. A mail system that receives an email and performs a given process,
An email receiver that accepts email sent from the sender,
An identification information generating unit that generates identification information for identifying a broadcast mail based on predetermined information included in the message data of the e-mail about the received e-mail;
If a given email and another email have the same identification information, an envelope containing the envelope destination of the given email and the envelope destination of the other email, and the given email or A mail system including a mail centralization processing unit for performing a mail centralization process for creating an electronic mail including message data of the other electronic mail.

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