JP2009188805A - Electronic mail system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic mail system capable of appropriately transferring electronic mail including an attached file. <P>SOLUTION: An electronic mail transmission system includes a means for separating an attachment file of electronic mail from the electronic mail and appending attachment file identification information to the electronic mail, a means for transmitting the electronic mail from which the attachment file is separated, to a destination, and a means for transferring the attachment file to an electronic mail receiving system in association with the attachment file identification information. The electronic mail receiving system includes a means for receiving transmitted electronic mail, a means for receiving the transferred attachment file and storing it in a storage means in association with the attachment file identification information, a means for acquiring the attachment file stored in the storage means on the basis of the attachment file identification information appended to the received electronic mail, and a means for attaching the acquired attachment file to the received electronic mail. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electronic mail system.

When analyzing a failure in a customer's computer system, a failure handler needs to receive material for investigating the failure from the customer. E-mail is often used for sending and receiving such materials because of its convenience and efficiency. In this case, the material is transmitted as an attached file attached to the e-mail.
Japanese Patent No. 3973352

  However, when the amount of data of the attached file is large, there is a case where an electronic mail to which the attached file is attached cannot be transmitted or received due to a restriction in a company mail policy or the like. Normally, an attached file of binary data is converted (encoded) into a text format, but there is a problem that the amount of data increases by nearly 20 to 30% due to encoding, thereby increasing the network load. In addition, if the amount of data in the attached file is large, there is a problem in that not only the electronic mail but also other electronic mails may be delayed or undeliverable. Furthermore, since a copy of the attached file is created in the mail server that relays the mail, there is a problem that the possibility of leakage of the content of the attached file increases.

  Note that the above problem applies not only to the exchange of electronic mail in response to a failure, but also to the exchange of general electronic mail.

  The present invention has been made in view of the above points, and an object of the present invention is to provide an electronic mail system capable of appropriately executing an electronic mail having an attached file.

  Therefore, in order to solve the above-described problem, the present invention is an electronic mail system having an electronic mail transmission system and an electronic mail reception system connected via a network, and the electronic mail transmission system is a transmission target Attachment file separation means for separating an attachment file of an e-mail from the e-mail, and adding attachment file identification information for identifying the attachment file to the e-mail; and the e-mail from which the attachment file is separated A mail sending means for sending the attached file, and an attached file transfer means for transferring the separated attached file to the electronic mail receiving system in association with the attached file identification information, wherein the electronic mail receiving system transmits the mail A mail receiving means for receiving an email sent by the means, and a previous An attached file receiving means for receiving the attached file transferred by the file transfer means and storing it in the storage means in association with the attached file identification information, and based on the attached file identification information added to the received e-mail It has an attachment file acquisition means which acquires the attachment file preserve | saved at the said memory | storage means, and an attachment means which attaches the acquired said attachment file to the said received email.

  In such an e-mail system, transfer of an e-mail having an attached file can be appropriately executed.

  ADVANTAGE OF THE INVENTION According to this invention, the electronic mail system which can perform appropriately transfer of the electronic mail which has an attached file can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram illustrating a configuration example of an electronic mail system according to an embodiment of the present invention. The electronic mail system shown in the figure is composed of an electronic mail transmission system 1 and an electronic mail reception system 2 connected by a network 50 such as the Internet (whether it is wired or wireless, the same applies to other networks). .

  The electronic mail transmission system 1 includes a mail server 110, a file transfer server 120, one or more sender terminals 130, and the like connected by a network 140 such as a LAN (Local Area Network).

  The sender terminal 130 is a computer such as a PC or a portable terminal equipped with a mailer used by a user (mail sender) for creating an e-mail or the like.

  The mail server 110 is a computer that controls transmission (transfer) of an electronic mail requested from the sender terminal 130, and includes a transmission request reception unit 111, an attached file separation unit 112, a mail transmission unit 113, and a transfer destination management table 114. Etc. The transmission request reception unit 111, the attached file separation unit 112, and the mail transmission unit 113 realize their functions by processing that the CPU loads a program loaded in the RAM of the mail server 110.

  The transmission request receiving unit 111 receives an e-mail transmission request from the sender terminal 130. The attached file separation unit 112 separates the attached file from the e-mail to be transmitted. The attached file separation unit 112 requests the file transfer server 120 to transfer the separated attached file, and adds information for uniquely identifying the attached file (hereinafter referred to as “file ID”) to the electronic mail. .

  The e-mail transmission unit 113 converts the e-mail (that is, the e-mail body) from which the attached file has been separated (excluded) into the e-mail destination (e-mail address) based on a protocol such as SMTP (Simple Mail Transfer Protocol). ). In the transfer destination management table 114, information for identifying the transfer destination of the attached file is information defined according to the mail address, and is stored in a storage device such as an HDD (Hard Disk Drive) of the mail server 110, for example. (Saved).

  The file transfer server 120 is a computer having a file transfer unit 121. The file transfer unit 121 transfers the attachment file requested to be transferred by the attachment file separation unit 112 to a transfer destination specified by a protocol such as FTP (File Transfer Protocol) or HTTP (HyperText Transfer Protocol). Here, the transfer destination is the file reception server 220 associated with the destination mail address of the e-mail to which the attached file is attached in the transfer destination management table 114. The file transfer unit 121 realizes its function by processing that the CPU loads a program loaded in the RAM of the file transfer server 120. When the attached file is transferred by FTP, the file transfer unit 121 can be realized using FTP client software.

  On the other hand, the e-mail receiving system 2 includes a mail server 210, a file receiving server 220, and one or more recipient terminals 230 connected by a network 240 such as a LAN.

  The recipient terminal 230 is a PC or a portable terminal that is a destination of an electronic mail transmitted from the mail server 110, and includes a mailer for the user to browse the received mail.

  The mail server 210 is a computer that controls distribution processing of an e-mail transmitted from the mail server 110 to a destination (recipient terminal 230), and includes a mail reception unit 211, a file acquisition unit 212, a file attachment unit 213, and a mail A distribution unit 214 and the like are included. Each of these units realizes its function by a process executed by the CPU loaded on the RAM of the mail server 120.

  The mail receiving unit 211 receives an electronic mail transferred by a protocol such as SMTP. Based on the file ID added to the received electronic mail (received mail), the file acquisition unit 212 acquires the attached file that should have been attached to the received mail from the file receiving server 220. The file attachment unit 213 attaches the attachment file acquired by the file acquisition unit 212 to the received mail. As a result, the received mail is restored to the original format. The mail distribution unit 214 distributes an e-mail addressed to the recipient terminal 230 in response to an e-mail acquisition request based on a protocol such as POP (Post Office Protocol) from the mailer of the recipient terminal 230.

  The file receiving server 220 is a computer having a file receiving unit 221. The file receiving unit 221 receives the attached file transferred from the file transfer unit 121 and stores it in the storage device of the file receiving server 220. The file receiving unit 221 realizes its function by a process executed by the CPU loaded on the RAM of the file receiving server 220. When the attached file is transferred by FTP, the file receiving unit 221 can be realized by using FTP server software.

  Hereinafter, the processing procedure of the electronic mail system of FIG. 1 will be described. First, the processing procedure in the electronic mail transmission system 1 will be described. FIG. 2 is a flowchart for explaining the processing procedure by the mail server of the electronic mail transmission system.

  In step S101, the transmission request receiving unit 111 of the mail server 110 receives an email transmission request from the client (the mailer of the sender terminal 130). One or more relay mail servers may be interposed between the sender terminal 130 and the mail server 110. In this case, an e-mail is received through these relay servers.

  Subsequently, the attached file separation unit 112 determines whether or not there is an attached file for the electronic mail (transmitted mail) designated as the transmission target (S102). The presence or absence of an attached file can be determined by referring to e-mail header information, for example.

  For example, FIG. 3 is a diagram illustrating an example of an e-mail without an attached file. FIG. 4 is a diagram illustrating an example of an electronic mail having an attached file. Comparing the two emails 510 and 520, it can be seen that the values of the ContentType fields 511 and 512 are different. Therefore, the attached file separation unit 112 determines the presence or absence of an attached file by referring to the value of the ContentType field.

  In the email 520, the description 522 corresponds to a description related to the attached file. From 522, it can be seen that the file name of the attached file is “to_be_attached.zip”. Note that the entity of the attached file is converted into a text format by being encoded by BASE64 or uencode.

  When there is no attached file (No in S102), the mail transmitting unit 113 transmits the transmitted mail as it is (S112). If there is an attached file (Yes in S102), the attached file separation unit 112 determines information indicating the transfer destination of the attached file corresponding to the destination of the transmission mail based on the transfer destination management table 114 (S103).

  FIG. 5 is a diagram illustrating a configuration example of the transfer destination management table. In the figure, in the transfer destination management table 114, information such as file transfer destination identification information, user ID, and password is associated and registered for each mail address.

  The file transfer destination identification information is a host name or IP address for identifying the file receiving server 220 that is a transfer destination of the attached file of the outgoing mail. The user ID and password are, for example, a user ID and password required when receiving authentication by the file receiving server 220.

  Therefore, in step S103, the file transfer destination identification information associated with the destination mail address of the outgoing mail in the transfer destination management table 114 is determined as the attached file transfer destination. The destination mail address of the outgoing mail can be identified by the value of the To field of the outgoing mail. In FIG. 5, the file transfer destination identification information is associated with each mail address. However, the host name or domain name (character string below @ of the mail address), which is a part of the mail address configuration information. The file transfer destination identification information may be associated with each other.

  If the transfer destination of the attached file cannot be normally determined, for example, if the destination mail address is not registered in the transfer destination management table 114 (No in S104), the transmission of the transmission mail is stopped (S113). ). However, it may be transmitted as it is as in step S112. In this case, since the transmitted mail is transferred with the attached file attached, the problem to be solved by the present invention is not solved.

  On the other hand, if the transfer destination of the attached file can be normally determined (Yes in S104), the attached file is returned (decoded) from the attached format (format encoded by BASE64 or uuencode) to the binary format and transmitted. Separated from the mail (S105). As a result, the description of the attached file (description 522 in FIG. 4) is removed (deleted) from the transmitted mail.

  Subsequently, the attached file separation unit 112 generates a file ID for uniquely identifying the separated attached file (S106). As the file ID, for example, a hash value based on information such as a transmission date and time, a transmission source mail address, and a destination mail address included in the transmission mail may be used.

  Subsequently, the attached file separation unit 112 makes the file name unique by reflecting the file ID in the file name of the separated attached file (S107). For example, when a file name is changed by adding a file ID as a character string to a predetermined position according to a predetermined naming rule, such as before or after the base name (part excluding the extension) of the original file name Good. Here, by ensuring the uniqueness of the file name of the attached file, each attached file can be identified when a plurality of e-mails to which the attached file having the same file name is attached are transmitted.

  Subsequently, the attached file separation unit 112 sends the attached file transfer request to the file transfer unit 121 of the file transfer server 120 with the attached file whose file name has been changed, the file transfer destination identification information, the user ID, and the password. (S108). Here, the file transfer destination identification information, the user ID, and the password are acquired from the transfer destination management table 114 based on the destination mail address of the outgoing mail. Note that identification information (IP address or host name) of the file transfer server 120 is registered in the storage device of the mail server 110. Therefore, the attached file separation unit 112 transmits an attached file transfer request to the file transfer server 120 based on the identification information.

  Thereafter, the transmission file separation unit 112 waits for the completion of the transfer of the attached file by the file transfer unit 121 (S109). When the notification that the transfer of the attached file is successful (completed) is received from the file transfer unit 121 (Yes in S109), the attached file separation unit 112 sends the mail header of the outgoing mail from which the attached file has been separated (deleted) The file ID generated in step S106 is recorded (added) (S110).

  FIG. 6 is a diagram illustrating an example of an electronic mail in which a file ID is recorded in the mail header. An X-Attached-file-ID-name field 531 is added to the header portion of the e-mail 530 shown in the figure, and “0123abc456def789_to_be_attached.zip” is recorded as the value of this field. This value is the file ID. The e-mail 530 is obtained by separating (deleting) the description 522 from the e-mail 520 of FIG. 4 and adding an X-Attached-file-ID-name field 531.

  Subsequently, the mail transmission unit 113 transmits (transfers) the transmission mail from which the attached file is separated to the destination using a protocol such as SMTP (S111). The outgoing mail transmitted from the mail server 110 is delivered to the mail server 210 via the network (in some cases, another mail server may relay the mail in the middle).

  Next, a processing procedure by the file transfer server 120 will be described. FIG. 7 is a flowchart for explaining a processing procedure by the file transfer server of the e-mail transmission system.

  When the file transfer unit 121 of the file transfer server 120 receives a transfer request for the attached file together with the attached file from the mail server 110 (S121), the file receiving server identified by the transfer destination identification information included in the transfer request For example, the attached file is transferred to 220 by a protocol such as FTP (S122). At this time, the file transfer unit 121 is authenticated by the file receiving server 220 using the user ID and password included in the transfer request. The attached file is transferred by a file name reflecting the file ID. Therefore, the attached file is transferred in a state where the association between the attached file and the file ID is maintained by the file name.

  When the transfer of the attached file is normally completed, the file transfer unit 121 notifies the mail server 110 of the success (completion) of the transfer of the attached file (S123).

  Next, a processing procedure in the electronic mail receiving system 2 will be described. FIG. 8 is a flowchart for explaining the processing procedure by the mail server of the electronic mail receiving system.

  When receiving the electronic mail (S201), the mail receiving unit 211 determines whether or not the file ID is included in the header part of the received electronic mail (received mail) (S202). Specifically, the mail receiving unit 211 searches the X-Attached-file-ID-name field 531 in the received mail. If the file ID is not included (No in S202), the mail receiving unit 211 stores the received mail as it is in the destination mailbox (S207).

  On the other hand, when the file ID is included (Yes in S202), the file acquisition unit 212 designates the file ID and transmits a request for transmitting the attached file to the file receiving unit 221 of the file receiving server 220. Then, an attached file corresponding to the file ID is acquired (S203). Note that identification information (IP address or host name) of the file receiving server 220 is registered in the storage device of the mail server 210. Therefore, the file acquisition unit 212 transmits an attachment file transmission request to the file reception server 220 based on the identification information.

  If the attachment file acquisition fails, for example, if the attachment file corresponding to the file ID does not exist in the file reception server 220 (No in S204), the file acquisition unit 212 stops the received mail restoration process ( S208). However, the received mail may be stored in the destination mailbox as it is, or may be stored in the mailbox with an error message added. Note that, on the electronic mail transmission system 1 side, since the electronic mail is transmitted after the transfer of the attached file is completed, the possibility that the attached file does not exist in the file receiving server 220 is low.

  When acquisition of the attached file is successful (Yes in S204), the file attachment unit 213 encodes the acquired attachment file by BASE64 or uuencode, and adds (adds) the description of the encoded attachment file to the received mail. As a result, the attached file is attached to the received mail (S205). At this time, if the file receiving server 220 has not restored the file name of the attached file (that is, removal or deletion of the file ID from the file name), the file name is restored based on a predetermined naming rule. Attach an attached file. In addition, accompanying the received mail, the file attachment unit 213 deletes the mail ID (X-Attached-file-ID-name field 531) from the received mail. Subsequently, the file attachment unit 213 stores the received mail restored to the original format by attaching the attached file in the destination mailbox (S206).

  Thereafter, when the mail delivery unit 214 receives a mail acquisition request from the mailer of the recipient terminal 230, it returns a received mail stored in the mailbox corresponding to the request source. Therefore, the received mail having the attached file is provided to the mailer with the attached file attached.

  Next, a processing procedure by the file receiving server 220 will be described. FIG. 9 is a flowchart for explaining the processing procedure by the file receiving server of the e-mail receiving system.

  When receiving the attached file transferred from the file transfer unit 121 (S221), the file receiving unit 221 of the file receiving server 220 stores the attached file in the storage device of the file receiving server 220 (S222). At this time, the file receiving unit 221 stores the attached file so that the association between the file ID and the attached file is maintained. Specifically, the attached file may be saved with the file name as it is. The file name of the transferred attached file includes a file ID. Therefore, the association with the file ID is maintained by the file name. Alternatively, the fill name may be restored by removing the file ID from the file name, and the association between the restored file name and the file ID may be managed. For example, a folder having a file ID as a name may be created, and an attached file may be saved under the folder.

  Subsequently, the file receiving unit 221 waits until an attachment file transmission request is received from the file acquisition unit 212 of the mail server 210 (S213). When the transmission request is received (S213), the file reception unit 221 returns an attached file associated with the file ID specified in the transmission request to the file acquisition unit 212 (S214). If the transmission request is not made even after a certain period of time has elapsed since the file reception unit 212 received the file, the mail body may not be delivered normally. You may delete the file.

  As described above, according to the electronic mail system in the present embodiment, the attached file is separated from the body of the electronic mail and transferred independently. Therefore, the enlargement of the size of the e-mail can be suppressed, and even if the size of the e-mail is limited in the mail policy, the attached file is not affected by the limitation. Can be forwarded to the destination side.

  Further, by independently transferring the attached file, it is possible to transfer it in a binary form, and it is possible to suppress an increase in communication amount due to encoding.

  Further, since the attached file is attached (synthesized) to the received mail in the mail server 210, the received mail can be handled with the same operational feeling as conventional when viewed from the mail recipient. That is, it is possible to centrally manage the body of the email and the attached file.

  It can be considered that the attached file is stored in the file transfer server 120 and the file acquisition unit 212 of the mail server 210 acquires the attached file from the file transfer server 120 by a protocol such as FTP. However, in this case, if access to the FTP server (file transfer server 120) from the outside is prohibited by a firewall (not shown) on the mail transmission system 1 side, an attached file is acquired on the e-mail receiving side. Can not.

  On the other hand, in the present embodiment, the e-mail transmission side (e-mail transmission system 1) transfers the attached file to the file reception server 220 on the e-mail reception side (e-mail reception system 2). Even when access from the outside to 120 is prohibited, the receiving side can obtain the attached file.

  Of course, when access to the FTP server from the outside is prohibited in a firewall (not shown) on the e-mail receiving system 2 side, transfer of attached files as in the present embodiment is also restricted.

  However, such restrictions can be lifted reasonably in the exchange of electronic mail in response to a failure. In the case of failure handling, the e-mail transmission system 1 is the customer side (the side requesting the investigation of the failure), and the e-mail receiving system 2 is the company side that investigates the failure. In this case, it is possible to realize the transfer of the attached file by allowing the failure investigation side to permit the firewall to transfer only the file (packet) from the customer to the FTP server (file receiving server 220). In such a form, there is no burden of changing the setting of the firewall on the customer side.

  Note that the functions of the mail server 110 and the file transfer server 120 may be realized by a single computer. Similarly, the functions of the mail server 210 and the file receiving server 220 may be realized by a single computer.

  As mentioned above, although the Example of this invention was explained in full detail, this invention is not limited to such specific embodiment, In the range of the summary of this invention described in the claim, various deformation | transformation・ Change is possible.

Regarding the above description, the following items are further disclosed.
(Appendix 1)
An e-mail system having an e-mail transmission system and an e-mail reception system connected via a network,
The e-mail transmission system includes:
An attached file separating means for separating an attached file of an e-mail to be transmitted from the e-mail, and adding attached file identification information for identifying the attached file to the e-mail;
Mail sending means for sending the e-mail with the attached file separated to a destination;
An attached file transfer means for transferring the separated attached file to the electronic mail receiving system in association with the attached file identification information;
The e-mail receiving system includes:
Mail receiving means for receiving an email sent by the mail sending means;
An attached file receiving means for receiving the attached file transferred by the file transferring means and storing the attached file in association with the attached file identification information;
An attachment file acquisition means for acquiring an attachment file stored in the storage means based on the attachment file identification information added to the received e-mail;
An e-mail system comprising: an attaching unit for attaching the acquired attached file to the received e-mail.
(Appendix 2)
The e-mail transmission system has transfer destination management means for managing identification information of a transfer destination of an attached file according to information constituting a mail address,
The attached file transfer means uses the transfer destination management means to determine transfer destination identification information corresponding to a mail address of a transmission source of an electronic mail to be transmitted, and based on the identification information, the attached file The electronic mail system according to supplementary note 1, wherein the electronic mail system is transferred.
(Appendix 3)
The electronic mail system according to appendix 1 or 2, wherein the attached file separating unit generates the attached file identification information so that the attached file can be uniquely identified.
(Appendix 4)
The attached file separating means changes the file name of the attached file so that the attached file identification information is included,
The electronic mail system according to appendix 3, wherein the attached file transfer means transfers the attached file by the changed file name.
(Appendix 5)
The electronic mail system according to claim 4, wherein the attachment means attaches the attached file to the received electronic mail by a file name obtained by removing the file identification information from the file name.
(Appendix 6)
6. The e-mail system according to claim 1, wherein the e-mail transmission unit transmits the e-mail after completion of the transfer of the attached file by the attached file transfer unit.
(Appendix 7)
An e-mail transfer method in an e-mail system having an e-mail transmission system and an e-mail reception system connected via a network,
The computer constituting the e-mail transmission system is:
An attachment file separation procedure for separating an attachment file of an e-mail to be transmitted from the e-mail, and adding attachment file identification information for identifying the attachment file to the e-mail;
A mail sending procedure for sending the e-mail with the attached file separated to a destination;
An attached file transfer procedure for associating the separated attached file with the attached file identification information and transferring it to the e-mail receiving system;
The computer constituting the e-mail receiving system is:
A mail receiving procedure for receiving an email sent by the mail sending procedure;
An attached file receiving procedure for receiving the attached file transferred by the file transferring procedure and storing the attached file in association with the attached file identification information;
An attachment file acquisition procedure for acquiring an attachment file stored in the storage unit based on the attachment file identification information added to the received e-mail;
An e-mail transfer method comprising: executing an attachment procedure for attaching the acquired attached file to the received e-mail.
(Appendix 8)
Mail receiving means for receiving an e-mail including attached file identification information indicating an attached file;
An attached file receiving means for receiving an attached file transferred separately from the e-mail and storing the attached file in association with the attached file identification information;
An attachment file acquisition means for acquiring an attachment file stored in the storage means based on the attachment file identification information included in the received e-mail;
An e-mail receiving apparatus comprising: an attaching unit for attaching the acquired attached file to the received e-mail.
(Appendix 9)
An email receiving method executed by a computer,
An email reception procedure for receiving an email including attachment identification information indicating an attachment;
Receiving an attached file transferred separately from the e-mail, and storing the attached file in association with the attached file identification information in a storage means;
An attachment file acquisition procedure for acquiring an attachment file stored in the storage means based on the attachment file identification information included in the received e-mail;
An e-mail receiving method comprising: an attaching procedure for attaching the acquired attached file to the received e-mail.
(Appendix 10)
A program for causing a computer to execute the electronic mail receiving method according to attachment 9.

It is a figure which shows the structural example of the electronic mail system in embodiment of this invention. It is a flowchart for demonstrating the process sequence by the mail server of an electronic mail transmission system. It is a figure which shows the example of the email without an attached file. It is a figure which shows the example of the electronic mail with an attached file. It is a figure which shows the structural example of a transfer destination management table. It is a figure which shows the example of the electronic mail by which file ID was recorded on the mail header. It is a flowchart for demonstrating the process sequence by the file transfer server of an electronic mail transmission system. It is a flowchart for demonstrating the process sequence by the mail server of an electronic mail receiving system. It is a flowchart for demonstrating the process sequence by the file receiving server of an electronic mail receiving system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 E-mail transmission system 2 E-mail reception system 50,140,240 Network 110 Mail server 111 Transmission request reception part 112 Attached file separation part 113 Mail transmission part 114 Transfer destination management table 120 File transfer server 121 File transfer part 130 Sender terminal 210 Mail server 211 Mail reception unit 212 File acquisition unit 213 File attachment unit 214 Mail distribution unit 220 File reception server 221 File reception unit 230 Receiver terminal

Claims (3)

An e-mail system having an e-mail transmission system and an e-mail reception system connected via a network,
The e-mail transmission system includes:
An attached file separating means for separating an attached file of an e-mail to be transmitted from the e-mail, and adding attached file identification information for identifying the attached file to the e-mail;
Mail sending means for sending the e-mail with the attached file separated to a destination;
An attached file transfer means for transferring the separated attached file to the electronic mail receiving system in association with the attached file identification information;
The e-mail receiving system includes:
Mail receiving means for receiving an email sent by the mail sending means;
An attached file receiving means for receiving the attached file transferred by the file transferring means and storing the attached file in association with the attached file identification information;
An attachment file acquisition means for acquiring an attachment file stored in the storage means based on the attachment file identification information added to the received e-mail;
An e-mail system comprising: an attaching unit for attaching the acquired attached file to the received e-mail. The e-mail transmission system has transfer destination management means for managing identification information of a transfer destination of an attached file according to information constituting a mail address,
The attached file transfer means uses the transfer destination management means to determine transfer destination identification information corresponding to a mail address of a transmission source of an electronic mail to be transmitted, and based on the identification information, the attached file The e-mail system according to claim 1, wherein the e-mail system is transferred.   3. The electronic mail system according to claim 1, wherein the attached file separating unit generates the attached file identification information so that the attached file can be uniquely identified.

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