JP5505169B2 - Mail transmission control method, mail transmission control device, and mail transmission control program - Google Patents

Description

  The present invention relates to a mail transmission control method, a mail transmission control apparatus, and a mail transmission control program.

  In recent years, e-mail technology has become widespread. If the terminal is connected to the network and the terminal has a mailer function, any terminal can use e-mail. For this reason, the user transmits and receives e-mails using a user-preferred terminal such as a home personal computer, a mobile terminal, or a company personal computer.

  Further, even when the terminal does not have a mailer function, such as Web (World Wide Web) mail, the user can send and receive e-mails by the proxy operation of the Web server. In this case, the user logs in to the Web server, and the Web server provides a mail function to the user terminal.

  Here, when the user uses e-mail, managing the mail environment such as the mail inbox and sent items individually for each terminal results in a different mail environment for each terminal. It will be bad. In order to deal with this problem, IMAP4 (Internet Message Access Protocol) that centrally manages the mail environment is used.

  The IMAP 4 allows the IMAP server to centrally manage information such as inboxes and transmitted items. A user can acquire information such as an inbox and a transmitted item by accessing the IMAP server from a terminal used for electronic mail. Therefore, the user can use e-mail in the same mail environment regardless of which terminal is used, such as a home personal computer, a portable terminal, or a company personal computer.

  FIG. 9 is a diagram for explaining the prior art. As shown in FIG. 9, this system includes an IMAP server 10, a client terminal 20, and an SMTP (Simple Mail Transfer Protocol) server 30. The IMAP server 10, the client terminal 20, and the SMTP server 30 are connected to each other via a network.

  The IMAP server 10 centrally manages the mail environment for each user, and has an inbox 15b and a transmitted item 15c in the storage unit 15. The client terminal 20 has a mailer 25, and this mailer 25 performs information communication with the IMAP server 10 and the SMTP server 30 to transmit and receive electronic mail. When the SMTP server 30 receives an e-mail transmission request from the mailer 25, the SMTP server 30 transmits the e-mail to a destination.

  Here, system processing when the mailer 25 transmits an e-mail will be described. First, the mailer 25 creates an electronic mail by setting a destination and inputting a mail text.

  After the e-mail is created, the mailer 25 transmits the e-mail to the SMTP server 30 and transmits an e-mail storage request to the IMAP server 10. The IMAP server 10 that has received the e-mail storage request registers the e-mail in the sent item 15c. As described above, when the mailer 25 performs processing, the e-mail is transmitted to the destination by the SMTP server 30, and the transmitted e-mail is stored in the IMAP server 10.

  The mailer 25 does not store the sent e-mail in the client terminal 20. For this reason, when the user refers to the information of the sent email, the mailer 25 needs to access the IMAP server 10 and acquire the sent email from the sent item 15c.

  Note that the IMAP server 10 is also used when the mailer 25 receives an e-mail. Since the e-mail addressed to the client terminal 20 is stored in the inbox 15b of the IMAP server 10, the mailer 25 accesses the IMAP server 10 and acquires the e-mail from the inbox 15b.

Japanese Patent No. 2936482

  When sending and receiving e-mail using an intermediate server such as the above-described Web server, the user needs to log in to the intermediate server every time the e-mail is used. For this reason, the user can use the e-mail smoothly if the e-mail is transmitted and received without using such an intermediate server.

  However, if the IMAP server centrally manages the mail information without using the intermediate server, and the terminal transmits the e-mail in cooperation with the IMAP server, if the network is unstable, There was a problem that the contents disappeared without remaining on the terminal.

  As described with reference to FIG. 9, when the mailer 25 transmits an e-mail, the mailer 25 does not store the e-mail by itself, but requests the IMAP server 10 to store the e-mail. For this reason, when the network is unstable, the e-mail does not reach the IMAP server 10 and the transmitted e-mail is lost.

  The disclosed technology has been made in view of the above, and prevents the e-mail from being lost even when the mail information is centrally managed on the server side without using an intermediate server. An object is to provide a mail transmission control method and the like that can be performed.

  The mail transmission control method disclosed in the present application includes: a management server that stores an email transmitted from a terminal mailer; and a mailer that notifies the management server of the email that has already been transmitted and requests the storage of the email. When the transmission control device that relays communication acquires an e-mail from the mailer and relays the e-mail by transmitting the acquired e-mail to the destination, and when the e-mail cannot be transmitted to the destination In addition, it is necessary to perform a resending step of retransmitting an electronic mail that could not be transmitted to the destination by adding the destination of the electronic mail to the destination of the electronic mail.

  According to the mail transmission control method disclosed in the present application, it is possible to prevent the e-mail from being lost even when the mail information is centrally managed on the server side without using the intermediate server. .

FIG. 1 is a diagram illustrating a configuration of a system according to the present embodiment. FIG. 2 is a diagram illustrating a configuration of the client terminal. FIG. 3 is a diagram illustrating an example of the data structure of an e-mail. FIG. 4 is a diagram illustrating an example of the data structure of the spool file. FIG. 5 is a diagram illustrating an example of a data structure of an e-mail to which additional information is added. FIG. 6 is a diagram illustrating an example of a screen displayed by the display unit. FIG. 7 is a flowchart showing the processing procedure of the stable mail transmission unit. FIG. 8 is a diagram illustrating an example of a computer that executes a mail transmission control program. FIG. 9 is a diagram for explaining the prior art.

  Hereinafter, embodiments of a mail transmission control method, a mail transmission control apparatus, and a mail transmission control program disclosed in the present application will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

  FIG. 1 is a diagram illustrating a configuration of a system according to the present embodiment. As shown in FIG. 1, this system includes an Internet Message Access Protocol (IMAP) server 10, a Simple Mail Transfer Protocol (SMTP) server 30, and a client terminal 100. The IMPA server 10, SMTP server 30, and client terminal 100 are connected to each other via a network.

  The IMAP server 10 is a server that centrally manages the mail environment for each user. The IMAP server 10 includes a storage unit 15. The storage unit 15 includes, for example, an inbox 15b and a transmitted item 15c. The inbox 15b stores an e-mail addressed to the client terminal. The sent item 15 c stores an electronic mail transmitted by the client terminal 100 instead of the client terminal 100. In response to a request from the client terminal 100, the IMAP server 10 notifies the client terminal 100 of information on the inbox 15b and the transmitted item 15c.

  The SMTP server 30 receives an electronic mail from the client terminal 100, and transmits the received electronic mail to a destination.

  The client terminal 100 is a terminal that performs various types of information processing. In particular, as a process closely related to the present invention, the client terminal 100 performs information communication with the IMAP server 10 and the SMTP server 30 to send and receive electronic mail. In addition, the client terminal 100 includes a mailer and a mail stable transmission unit, as will be described later.

  Next, the configuration of the client terminal 100 will be described. FIG. 2 is a diagram illustrating a configuration of the client terminal. As illustrated in FIG. 2, the client terminal 100 includes an input unit 110, a display unit 120, a communication unit 130, a control unit 140, and a storage unit 150.

  The input unit 110 corresponds to an input device such as a keyboard, a mouse, or a touch panel. The user operates the input unit 110 to create an e-mail destination and an e-mail text. The display unit 120 corresponds to a display device such as a display or a monitor.

  The display unit 120 displays information acquired from the control unit 140. For example, the display unit 120 displays information on the destination address and the content of the e-mail. The communication unit 130 is a processing unit that performs information communication with the IMAP server 10 and the SMTP server 30. The control unit 140 performs information communication between the IMAP server 10 and the SMTP server 30 via the communication unit 130.

  The control unit 140 includes a mailer unit 141 and a mail stable transmission unit 142. Among these, the mailer unit 141 is a processing unit that manages creation of electronic mail and transmission / reception of electronic mail. The control unit 140 corresponds to an integrated device such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array). Alternatively, the control unit 140 corresponds to an electronic circuit such as a CPU (Central Processing Unit) or an MPU (Micro Processing Unit). Note that the stable mail transmission unit 142 corresponds to the mail transmission control device in the claims.

  First, a process when the mailer unit 141 transmits an e-mail will be described. The mailer unit 141 accesses the IMAP server 10 and receives a mail to be returned. Then, the mailer unit 141 outputs the destination address to the display unit 120. After the destination address is displayed on the display unit 120, the user refers to the display unit 120 and operates the input unit 110 to input the mail text. The mail text is a message notified to the transmission partner.

  The mailer unit 141 acquires a destination address and a mail text from the input unit 110, and creates an electronic mail. FIG. 3 is a diagram illustrating an example of the data structure of an e-mail. As shown in FIG. 3, this electronic mail includes a sender address, a destination address, a mail header, and a mail text. In the example shown in FIG. 3, “xxx1@yyy.co.jp” is stored in the sender address, and “xxx2@yyy.co.jp, xxx3@yyy.co.jp” is stored in the destination address. Thus, when two destination addresses are stored in the destination address, there are two destinations. In addition, mail header information is stored in the mail header, and mail body information is stored in the mail body.

  After creating the e-mail, the mailer unit 141 outputs the e-mail to the mail stable transmission unit 142. Further, the mailer unit 141 transmits an e-mail to the IMAP server 10 and stores the e-mail in the transmitted item 15 c of the IMAP server 10.

  Next, processing when the mailer unit 141 transmits an e-mail will be described. The mailer unit 141 accesses the IMAP server 10 and receives information in the inbox 15b. Then, the mailer unit 141 outputs an e-mail addressed to the client terminal 100 included in the inbox 15b to the display unit 120.

  In addition, when the mailer part 141 receives the browsing request | requirement of the transmitted item 15c from the input part 110, it accesses the IMAP server 10 and receives the transmitted item 15c. Then, the mailer unit 141 outputs information on the transmitted electronic mail included in the transmitted item 15c to the display unit 120.

  The stable mail transmission unit 142 is a processing unit that acquires an electronic mail from the mailer unit 141, relays the electronic mail, and transmits the electronic mail to the SMTP server 30. Further, when the network is unstable, the stable mail transmission unit 142 adds the address stored in the transmission source address of the electronic mail to the destination address of the electronic mail, and the electronic mail is normally transmitted to the SMTP server 30. Repeat until it is sent to.

The stable mail transmission unit 142 includes a mail reception unit 142a and a mail transmission processing unit 142b. The mail reception unit 142a is a processing unit that acquires an electronic mail from the mailer unit 141, converts the electronic mail into a spool file 150a, and temporarily stores the electronic mail in the storage unit 150.

  The storage unit 150 is a storage unit that stores the spool file 150a. For example, the storage unit 150 corresponds to a semiconductor memory device such as a random access memory (RAM), a read only memory (ROM), or a flash memory, or a storage device such as a hard disk or an optical disk.

  FIG. 4 is a diagram illustrating an example of the data structure of the spool file. In the example shown in FIG. 4, the spool file is expressed in XML (Extensible Markup Language). In FIG. 4, 1a includes information corresponding to an e-mail transmission address. Information corresponding to the destination address of the e-mail is included in 1b and 1c. 1d includes information corresponding to the mail header of the e-mail. 1e includes information corresponding to the mail text of the e-mail.

  The mail transmission processing unit 142b converts the spool file 150a stored in the storage unit 150 into an electronic mail, and transmits the electronic mail to the SMTP server 30. The data structure of the e-mail is the same as the data structure of the e-mail shown in FIG. The mail transmission processing unit 142b performs information communication with the SMTP server 30 after transmitting the electronic mail, and determines whether the electronic mail is normally transmitted to the SMTP server 30.

  For example, when the mail transmission processing unit 142b receives a response indicating that the electronic mail is normally received from the SMTP server 30, the mail transmission processing unit 142b determines that the electronic mail is normally transmitted to the SMTP server 30. On the other hand, the mail transmission processing unit 142b determines that the electronic mail is not normally transmitted to the SMTP server 30 when the response indicating that the electronic mail is normally received from the SMTP server 30 is not received.

  When the network is stable and the e-mail is normally transmitted to the SMTP server 30, the e-mail transmission processing unit 142b deletes the spool file 150a in the storage unit 150.

  On the other hand, when the network is unstable and the email is not normally transmitted to the SMTP server 30, the mail transmission processing unit 142b adds additional information to the email and then sends the email to the SMTP server 30. Resend mail. When the mail transmission processing unit 142b gives this additional information to the e-mail, the sender address is added to the destination address of the e-mail, and information for identifying the mail stable transmission unit is added to the mail header. FIG. 5 is a diagram illustrating an example of a data structure of an e-mail to which additional information is added. As shown in FIG. 5, the sender address “xxx1@yyy.co.jp” is added to the destination address. Although not shown, the mail transmission processing unit 142b adds information indicating that the mail stable transmission unit 142 has retransmitted the mail to the mail header as additional information.

  The mail transmission processing unit 142b continues to retransmit the e-mail until the network is in a stable state and the e-mail to which the additional information is added is normally transmitted to the SMTP server 30. Note that the time interval until the e-mail is retransmitted is set in advance by the user. In addition, the mail transmission processing unit 142b may interrupt the retransmission when a predetermined time has elapsed since the start of the retransmission of the electronic mail.

  The client terminal 100 is included in the destination of the retransmitted e-mail. For this reason, the retransmitted electronic mail is transmitted to the destination set by the user and is stored in the inbox 15b of the IMAP server 10. In other words, even when the mailer unit 141 makes a request to save the email to the IMAP server 10, the network condition is poor, and even if the email is not stored in the sent item 15 c of the IMAP server 10, The mail is stored in the inbox 15b.

  Further, the mail transmission processing unit 142b outputs to the display unit 120 that the transmission of the electronic mail is delayed when the electronic mail is retransmitted. FIG. 6 is a diagram illustrating an example of a screen displayed by the display unit. By referring to this screen, the user can confirm whether or not the transmission of the e-mail has been completed.

  Next, the processing procedure of the mail stable transmission unit 142 will be described. FIG. 7 is a flowchart showing the processing procedure of the stable mail transmission unit. As shown in FIG. 7, the stable mail transmission unit 142 receives an email from the mailer unit 141 (step S101), and temporarily stores the email as a spool file in the storage unit 150 (step S102).

  The stable mail transmission unit 142 relays the electronic mail to the SMTP server 30 (step S103), and determines whether the relay is successful (step S104). When the relay is successful (Yes at Step S104), the stable mail transmission unit 142 deletes the temporarily stored spool file (Step S105).

  On the other hand, when the relay fails (step S104, No), the stable mail transmission unit 142 determines whether or not the relay fails for the first time (step S106). The stable mail transmission unit 142 proceeds to step S108 when the relay has failed for the second time or later (step S106, No).

  If the relay is unsuccessful for the first time (step S106, Yes), the stable mail transmission unit 142 displays that the relay of the electronic mail has failed (step S107). Then, the stable mail transmission unit 142 adds the sender's mail address to the destination of the electronic mail (step S108).

  The stable mail transmission unit 142 retransmits the electronic mail to the SMTP server 30 after a predetermined time (step S109), and determines whether the relay is successful (step S110). The mail stable transmission part 142 complete | finishes a process, when relaying is successful (step S110, Yes). On the other hand, the stable mail transmission unit 142 proceeds to step S106 when the relay fails (step S110, No).

  Next, the effect of the client terminal 100 including the mail stable transmission unit 142 according to the present embodiment will be described. The stable mail transmission unit 142 can acquire an e-mail from the mailer unit 141 and, when the e-mail cannot be transmitted to the destination, can add the destination address of the client terminal 100 to the e-mail destination and transmit it to the destination. Resend the missing email. The retransmitted e-mail is transmitted to the originally set destination and is stored in the inbox 15b of the IMAP server 10 as an e-mail addressed to the client terminal 100. For this reason, it is possible to prevent the transmitted email from being lost even if the email requested by the mailer unit 141 to be stored does not reach the IMAP server 10 and is not stored in the transmitted item 15c due to a network malfunction. Can do.

  Further, the stable mail transmission unit 142 according to the present embodiment outputs to the display unit 120 that the transmission of the electronic mail is delayed when the network is unstable and the electronic mail is retransmitted. For this reason, the user does not need to set BCC (Blind Carbon Copy) or CC (Carbon Copy) to himself / herself in order to confirm transmission.

  By the way, as described above, when the stable mail transmission unit 142 retransmits the electronic mail, information indicating that the stable mail transmission unit 142 retransmits the electronic mail is included in the mail header. Therefore, the IMAP server 10 refers to the mail header when storing the e-mail in the inbox 15b, and if this e-mail is retransmitted from the mail stable transmission unit 142, the IMAP server 10 It may be stored in the inbox 15b separately from other electronic mails. In this manner, by distinguishing the electronic mails retransmitted from the stable mail transmission unit 142 and storing them in the reception box 15b, the user can easily search for the transmitted electronic mails from the reception box 15b.

  The configuration of the client terminal 100 illustrated in FIG. 2 is an example. For example, the function of the stable mail transmission unit 142 may be incorporated in a mail checker or the like. This mail checker relays the electronic mail from the mailer unit 141 to the SMTP server 30, and at the same time confirms the content of the electronic mail and prevents the electronic mail from being transmitted to a predetermined destination. As described above, combining the mail checker and the stable mail transmission unit 142 can prevent the erroneous transmission of the electronic mail and can solve the problem that the transmitted electronic mail is lost.

  The client terminal 100 shown in FIG. 2 has been described by way of example using the IMAP server 10 when receiving an e-mail addressed to the client terminal 100. However, the present invention is not limited to this. For example, the client terminal 100 may receive an e-mail from a POP (Post Office Protocol) server.

  By the way, the configuration of the client terminal 100 shown in FIG. 1 is an example, and the client terminal 100 does not necessarily have all the processing units shown in FIG. For example, the client terminal 100 only needs to have a mailer and a mail transmission control unit that relays electronic mail from the mailer to the SMTP server 30. For example, the mail transmission control unit includes a relay unit and a retransmission unit.

  Among these, the relay unit acquires an electronic mail from a mailer, and relays the electronic mail by transmitting the acquired electronic mail to a destination. The relay unit is included in the mail reception unit 142a in FIG. When the e-mail cannot be transmitted to the destination, the resending unit adds the e-mail transmission source destination to the e-mail destination, and re-sends the e-mail that could not be transmitted to the destination. This resending unit is included in the mail transmission processing unit 142b of FIG.

  By the way, the various processes of the stable mail transmission unit 142 described in the above embodiments can be realized by executing a program prepared in advance on a computer system such as a personal computer or a workstation. In the following, an example of a computer that executes a mail transmission control program having the same function as the mail stable transmission unit 142 described in the above embodiment will be described with reference to FIG. FIG. 8 is a diagram illustrating a computer that executes a mail transmission control program.

  As illustrated in FIG. 8, the computer 200 includes an input / output control unit 210, an HDD (Hard Disk Drive) 220, and a RAM 230. The computer 200 has a CPU (Central Processing Unit) 240. Each device 210 to 240 is configured by being connected by a bus 250.

  Here, the input / output control unit 210 controls input / output of various types of information. The HDD 220 stores information necessary for the CPU 240 to execute various processes. The RAM 230 temporarily stores various information. The CPU 240 executes various arithmetic processes.

  The HDD 220 stores mail transmission control system data in advance. The mail transmission control system data includes a mail transmission control program that exhibits the same function as each processing unit of the client terminal 100 shown in FIG. The mail transmission control system data can be appropriately distributed and stored in a storage unit of another computer that is communicably connected via a network.

  Then, the CPU 240 reads the mail transmission control system data from the HDD 220 and expands it in the RAM 230, so that the mail transmission control system data functions as a mail transmission control process.

  The mail transmission control process reads out data used for mail transmission control from the HDD 220, expands it in an area allocated to itself in the RAM 230, and executes various processes based on the expanded data and the like.

  The mail transmission control process corresponds to the process executed in the control unit 140 shown in FIG.

  Note that the above-described mail transmission control program is not necessarily stored in the HDD 220 from the beginning.

  For example, each program is stored in a “portable physical medium” such as a flexible disk (FD), a CD-ROM, a DVD disk, a magneto-optical disk, and an IC card inserted into the computer 200. Then, the computer 200 may read and execute each program from these.

  Further, each program is stored in “another computer (or server)” connected to the computer 200 via a public line, the Internet, a LAN, a WAN, or the like. Then, the computer 200 may read and execute each program from these.

  The following supplementary notes are further disclosed with respect to the embodiments including the above examples.

(Additional remark 1) Transmission control which relays communication with the management server which preserve | saves the email transmitted from the mailer of a terminal, and the mailer which notifies the transmitted email to the said management server, and performs the preservation | save request | requirement of this email The device
A relay step of acquiring the email from the mailer and relaying the email by sending the acquired email to a destination;
If the e-mail could not be sent to the destination, add a destination of the e-mail transmission source to the e-mail destination, and re-send the e-mail that could not be sent to the destination A mail transmission control method characterized by:

(Supplementary note 2) The mail transmission control method according to supplementary note 1, further comprising a notification step of notifying the mailer that transmission of the electronic mail is delayed when the electronic mail cannot be transmitted to the destination. .

(Additional remark 3) The step which memorize | stores in a memory | storage device, if an electronic mail is acquired,
3. The mail transmission control method according to appendix 1 or 2, further comprising a step of deleting the electronic mail stored in the storage device when the electronic mail can be transmitted to a destination.

(Additional remark 4) The said transmission control apparatus is provided as one function of the said terminal, The mail transmission control method of Additional remark 1, 2 or 3 characterized by the above-mentioned.

(Supplementary Note 5) An e-mail is acquired from a mailer that sends an e-mail to the management server that stores the e-mail transmitted from the terminal mailer and requests to store the e-mail, and the acquired e-mail is sent to the destination A relay unit that relays the e-mail by transmitting to
A resending unit that resends an e-mail that could not be sent to the destination by adding the e-mail sending destination to the e-mail destination when the relay unit could not send the e-mail to the destination; A mail transmission control apparatus comprising:

(Supplementary note 6) The supplementary note 5, further comprising a notification unit for notifying the mailer that the transmission of the electronic mail is delayed when the relay unit cannot transmit the electronic mail to the destination. Mail transmission control device.

(Supplementary Note 7) A storage processing unit that stores an electronic mail in a storage device when the electronic mail is acquired;
The mail transmission control apparatus according to appendix 5 or 6, further comprising a deletion unit that deletes the electronic mail stored in the storage device when the electronic mail can be transmitted to a destination.

(Appendix 8)
Notifying the management server that stores the email sent from the mailer of the terminal of the sent email, obtaining the email from the mailer that requests to save the email, and sending the obtained email to the destination A relay procedure for relaying the e-mail;
A resending procedure for re-sending an e-mail that could not be sent to the destination by adding the e-mail source address to the e-mail destination if the e-mail could not be sent to the destination in the relay procedure; An e-mail transmission control program characterized in that is executed.

(Supplementary note 9) The supplementary note 8 further causes the computer to execute a notification procedure for notifying the mailer that the transmission of the electronic mail is delayed when the electronic mail cannot be transmitted to the destination by the relay procedure. The mail transmission control program described.

(Supplementary Note 10) A storage processing procedure for storing an electronic mail in a storage device when the electronic mail is acquired;
10. The mail transmission control program according to appendix 8 or 9, further causing a computer to execute a deletion procedure for deleting the electronic mail stored in the storage device when the electronic mail can be transmitted to a destination. .

DESCRIPTION OF SYMBOLS 10 IMAP server 30 SMTP server 100 Client terminal 140 Control part 141 Mailer part 142 Mail stable transmission part 142a Mail reception part 142b Mail transmission processing part

Claims (6)

A transmission control device that relays communication between a management server that stores an email transmitted from a mailer of a terminal, and a mailer that notifies the management server of an email that has been transmitted and requests to store the email,
A relay step of acquiring the email from the mailer and relaying the email by sending the acquired email to a destination;
When the e-mail cannot be sent to the destination, a resending step is performed in which the destination of the e-mail is added to the destination of the e-mail and the e-mail that could not be sent to the destination is resent. The mail transmission control method characterized by the above-mentioned.   The mail transmission control method according to claim 1, further comprising a notification step of notifying the mailer that the transmission of the electronic mail is delayed when the electronic mail cannot be transmitted to the destination. Storing the e-mail in a storage device upon obtaining the e-mail;
The mail transmission control method according to claim 1, further comprising a step of deleting the electronic mail stored in the storage device when the electronic mail can be transmitted to a destination.   The mail transmission control method according to claim 1, wherein the transmission control device is provided as one function of the terminal. Notifying the management server that stores the email sent from the mailer of the terminal of the sent email, obtaining the email from the mailer that requests to save the email, and sending the obtained email to the destination A relay unit for relaying the e-mail;
A resending unit that resends an e-mail that could not be sent to the destination by adding the e-mail sending destination to the e-mail destination when the relay unit could not send the e-mail to the destination; A mail transmission control apparatus comprising: On the computer,
Notifying the management server that stores the email sent from the mailer of the terminal of the sent email, obtaining the email from the mailer that requests to save the email, and sending the obtained email to the destination A relay procedure for relaying the e-mail;
A resending procedure for re-sending an e-mail that could not be sent to the destination by adding the e-mail source address to the e-mail destination if the e-mail could not be sent to the destination in the relay procedure; An e-mail transmission control program characterized in that is executed.

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