JP2009182749A - Device, method, and program for distributing electronic mail - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily set conditions for sorting electronic mails. <P>SOLUTION: An electronic mail distribution device includes: an electronic mail reception controller (S01) for receiving an electronic mail; a permitting part for permitting transmission of the received electronic mail on condition that an electronic mail address of a transmission source contained in the received electronic mail is linked to the electronic mail address of a transmission destination (YES in S11); an electronic mail transmission controller (S12) for transmitting electronic mail whose transmission is permitted by the permitting part among received electronic mails, and a linking part (S07) for linking the electronic mail address of the transmission source contained in the received electronic mail to the electronic mail address of the transmission destination of the electronic mail, when a reply electronic mail satisfying a predetermined condition is received (YES in S05). <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an e-mail delivery device, an e-mail delivery method, and an e-mail delivery program.

  In recent years, e-mail has become widespread as an information transmission means. However, because of its convenience, a so-called junk e-mail addressed to an unspecified majority may be transmitted by a malicious business operator or individual. In an e-mail server, in order to refuse the reception of spam mails, spam mails may be sorted from other mails by presetting email addresses that are refused reception or domains included in email addresses. ing. However, there is a problem that the receiver has to make these settings.

  Japanese Patent Application Laid-Open No. 2006-101474 discloses a method for receiving mail addressed to a user in its own network, and when receiving a mail, a mail that stores a list of reception-permitted mail addresses that are permitted to receive mail for each user. Search the address database to determine whether the incoming email address list is included in the incoming email address list for users who use the incoming email address. If the address is not included in the reception-permitted email address list, a tag is issued, and the tag and the source email address and destination email address of the received email are stored in association with each other. Because URLs including issued tags and email transmission are permitted Returns a mail stating that access to this URL is necessary, and when access to this URL is accepted, a user who uses the destination mail address of the received mail stored in association with the tag included in this URL When the key is correctly entered, the sender's email address of the received email stored in association with the tag included in the URL is added to the list of email addresses permitted to be received by the user of this key. How to receive mail is described.

However, in the conventional mail receiving method, the e-mail recipient has to set a key, and the e-mail sender accesses the URL described in the sent e-mail and receives the address. You must enter a key for the user who will use the email address. For this reason, there is a problem that the sender and the receiver must make necessary settings.
JP 2006-101474 A

  The present invention has been made to solve the above-described problems, and one of the objects of the present invention is to provide an e-mail delivery apparatus capable of easily setting conditions for selecting e-mails. That is.

  Another object of the present invention is to provide an e-mail delivery method capable of easily setting conditions for selecting e-mails.

  Still another object of the present invention is to provide an e-mail delivery program capable of easily setting conditions for selecting e-mails.

  In order to achieve the above-described object, according to one aspect of the present invention, an e-mail delivery apparatus receives a receiving unit that receives an e-mail and an e-mail address of a transmission source included in the received e-mail On the condition that it is associated with the destination e-mail address included in the e-mail, the permission means for permitting the transmission of the received e-mail and the permission means among the received e-mails are permitted to transmit. Transmitting means for transmitting a thing, and association means for associating a source e-mail address with a destination e-mail address included in the received e-mail when a predetermined e-mail satisfying a predetermined condition is received .

  According to this aspect, if the source email address included in the email is associated with the destination email address, the email is sent to the destination email address, but it must be associated. In this case, the e-mail is not transmitted to the destination e-mail address. In addition, when a predetermined e-mail satisfying a predetermined condition is received, the e-mail address of the transmission source is associated with the e-mail address of the transmission destination included in the received e-mail. For this reason, the sender can associate the recipient's email address with the email address assigned to himself / herself only by sending a prescribed email satisfying a prescribed condition. As a result, it is possible to provide an electronic mail delivery apparatus that can easily set conditions for selecting electronic mail.

  Preferably, the associating means, when the transmission source email address included in the received email is not associated with the transmission destination email address, the transmission source email address included in the received email A re-transmission request unit that transmits a related electronic mail related to the received e-mail, and a reply e-mail to the related e-mail transmitted by the re-transmission request unit is received as a predetermined e-mail.

  According to this aspect, when the related e-mail is transmitted to the e-mail address of the transmission source included in the received e-mail, and the reply e-mail to the related e-mail is received, the destination included in the received e-mail The source e-mail address is associated with the e-mail address. For this reason, the sender can associate the destination email address with the email address assigned to the sender simply by replying to the related email.

  Preferably, the associating unit associates the e-mail address of the transmission source with the e-mail address of the transmission destination included in the received e-mail on the condition that the reply e-mail includes a predetermined keyword.

  According to this aspect, on the condition that the reply e-mail includes a predetermined keyword, the e-mail address of the transmission source is associated with the e-mail address of the transmission destination included in the received e-mail. For this reason, since only the e-mail address assigned to the person who knows the keyword is associated, it is possible to transmit only the e-mail generated by the reliable person.

  According to still another aspect of the present invention, an e-mail delivery method includes a step of receiving an e-mail, and a transmission destination included in the received e-mail address of a transmission source included in the received e-mail A step of permitting the transmission of the received e-mail on the condition that the e-mail address is associated with the e-mail address, and a step of transmitting the received e-mail that is permitted to be transmitted in the step of permitting, Associating a source e-mail address with a destination e-mail address included in the received e-mail when a predetermined e-mail satisfying a predetermined condition is received.

  According to this aspect, it is possible to provide an electronic mail delivery method capable of easily setting conditions for selecting electronic mail.

  According to still another aspect of the present invention, an e-mail delivery program includes a step of receiving an e-mail and a transmission destination included in the received e-mail address of a transmission source included in the received e-mail A step of permitting the transmission of the received e-mail on the condition that the e-mail address is associated with the e-mail address, and a step of transmitting the received e-mail that is permitted to be transmitted in the step of permitting, When a predetermined e-mail satisfying a predetermined condition is received, a step of associating the e-mail address of the transmission source with the e-mail address of the transmission destination included in the received e-mail is executed by the computer.

  According to this aspect, it is possible to provide an e-mail delivery program that can easily set conditions for selecting e-mails.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

  FIG. 1 is a diagram showing an overall outline of an electronic mail delivery system in one embodiment of the present invention. Referring to FIG. 1, the e-mail delivery system includes an e-mail server 100 and five PCs 201 to 205. Each of the e-mail server 100 and the PCs 201 to 205 is connected to the Internet. Therefore, the e-mail server 100 and the PCs 201 to 205 can communicate with each other. Here, an example is shown in which five PCs 201 to 205 are connected to the Internet. However, the number of PCs 201 to 205 is not limited, and one or more may be connected.

  An electronic mail transmission / reception program is installed in each of the PCs 201 to 205. Therefore, the user can send and receive e-mails via the e-mail server 100 by operating the PCs 201 to 205.

  Although the case where the e-mail server 100 and the PCs 201 to 205 are connected via the Internet has been described as an example here, a local area network (LAN), a wide area network (WAN), a public switched telephone network (Public Switched Telephone) (Networks) may be used for connection.

  Here, e-mail transmission / reception will be described by taking as an example a case where the e-mail addresses assigned to the users A and B are managed by the e-mail server 100. When the user A operates the PC 201 to create an e-mail addressed to the user B and instruct transmission, the PC 201 transmits the e-mail to the e-mail server 100. As a communication protocol at this time, SMTP (Simple Mail Transfer Protocol) is used. At this stage, the email server 100 temporarily stores the email received from the PC 201. On the other hand, when the user B operates the PC 205 to receive an email, the PC 205 accesses the email server 100. In response to this, if the e-mail addressed to the user B is temporarily stored, the e-mail server 100 returns it to the PC 205. As a communication protocol at this time, POP (Post Office Protocol) or IMAP (Internet Message Access Protocol) is used.

  Here, the case where the e-mail addresses respectively assigned to the user A and the user B are managed by the e-mail server 100 has been described as an example. However, the e-mail server that manages the e-mail addresses assigned to the user A And an e-mail server that manages an e-mail address assigned to the user B may be a different computer. In this case, the email sent by the PC 200 is sent to an email server that manages the email address assigned to the user A, and further manages the email address assigned to the user B from the email server. Sent to the e-mail server and temporarily stored in the e-mail server. Then, when the user B operates the PC 205 to receive the email, the PC 205 accesses an email server that manages the email address assigned to the user B, and the email addressed to the user B is temporarily stored. If so, download it.

  FIG. 2 is a block diagram showing an example of an outline of the hardware configuration of the e-mail server in the present embodiment. Referring to FIG. 2, an e-mail server 100 includes a CPU 101 for controlling the entire e-mail server 100, a ROM (Read Only Memory) 102 for storing a program executed by the CPU 100, and operations of the CPU 101. RAM (Random Access Memory) 103 used as an area, a network interface (I / F) 104 for connecting the electronic mail server 100 to the Internet, a hard disk drive (HDD) 105 as a mass storage device, information Is displayed, and an operation unit 107 that receives an input of a user operation.

  FIG. 3 is a functional block diagram showing an example of functions of the CPU provided in the electronic mail server together with information stored in the HDD. Referring to FIG. 3, CPU 101 provided in e-mail server 100 includes e-mail reception control unit 11 that receives e-mail, association unit 13 that generates association data, and e-mail transmission control that transmits e-mail. A unit 19 and a permission unit 21 that permits transmission of electronic mail are included.

  When the network I / F 104 receives an email from any of the PCs 201 to 205, the email reception control unit 11 receives the email from the network I / F 104, stores the received email 31 in the HDD 105, and associates the email. To the unit 13. As a result, the e-mail 31 is stored in the HDD 105.

  The association unit 13 generates an association record when a predetermined condition is satisfied, and stores the association record in addition to the association data 33 stored in the HDD 105. The association data 33 includes an association record that associates a transmission source address and a transmission destination address.

  FIG. 4 is a diagram illustrating an example of the format of an associated record. Referring to FIG. 4, the association record includes a transmission destination address field and a transmission source address field. In the destination address field, the destination e-mail address included in the e-mail is set, and in the source address field, the e-mail address of the source included in the e-mail is set. The association record associates the transmission source electronic mail address with the transmission destination electronic mail address.

  Returning to FIG. 3, the associating unit 13 includes a retransmission requesting unit 15 and a response receiving unit 17. The retransmission request unit 15 determines whether or not the transmission source email address included in the email input from the email reception control unit 11 is associated with the transmission destination email address. Specifically, in the association record included in the association data 33 stored in the HDD 105, the destination email address included in the email input from the email reception control unit 11 is the destination address. It is determined whether or not an association record set in the field and the sender's e-mail address is set in the sender address field is included.

  The retransmission request unit 15 generates a related electronic mail when the transmission source electronic mail address is not associated with the transmission destination electronic mail address. The related e-mail is an e-mail associated with an e-mail input from the e-mail reception control unit 11, and an e-mail address of a transmission source of the e-mail input from the e-mail reception control unit 11 is set as a transmission destination. For example, a message requesting a reply such as “e-mail sent earlier is sent if it is replied to this e-mail but not sent if it is not replied” is included. Then, the retransmission request unit 15 transmits the generated related electronic mail. Note that the email address of the related email may be set as the email address of the email input from the email reception control unit 11, or the email address assigned to the email server 100 may be set. An email address may be set.

  When the network I / F 104 receives a reply e-mail returned from any of the PCs 201 to 205 to the related e-mail, the response receiving unit 17 receives the reply e-mail from the network I / F 104. Then, the response reception unit 17 generates an association record from the email address of the transmission destination of the email input from the email reception control unit 11 and the email address of the transmission source, and the generated association record is stored in the HDD 105. Is stored in addition to the associated data 23 stored in.

  When a reply e-mail to the related e-mail is received, an associated record is generated and stored in addition to the associated data 23, so that the sender of the e-mail can perform a simple operation to reply to the related e-mail. By simply doing this, it is possible to associate the e-mail address assigned to the destination user with the e-mail address assigned to the user.

  In addition, the response receiving unit 17 measures the time since the transmission of the related electronic mail, and when the reply electronic mail is received within a predetermined time, the electronic mail input from the electronic mail reception control unit 11 An association record may be generated and stored from the destination e-mail address and the source e-mail address included in.

  Some junk e-mails do not have a sender e-mail address. Since the related electronic mail is not transmitted for such junk mail, the reply electronic mail for the related electronic mail is not received. For this reason, the e-mail address of the junk mail for which the e-mail address of the transmission source is not set is not associated with the e-mail address of the transmission destination.

  In many cases, junk mail is transmitted by a computer in which an e-mail address randomly extracted or generated by a computer is set as an e-mail transmission destination. In this case, even if the computer that generated the junk mail receives the related e-mail, it cannot send a reply e-mail to it. For this reason, the e-mail address of the junk mail for which the e-mail of the destination is automatically set by the computer is not associated with the e-mail address of the destination.

  When the network I / F 104 receives an e-mail transmission request from any of the PCs 201 to 205, the e-mail transmission control unit 19 outputs an e-mail address specified by information included in the transmission request to the permission unit 21. The e-mail address specified by the information included in the transmission request is an e-mail address assigned to the user who has transmitted the transmission request. The transmission request may include an e-mail address.

  The e-mail transmission control unit 19 extracts an e-mail in which an e-mail address specified by information included in the transmission request is set as a transmission destination from the e-mails 31 stored in the HDD 105. Then, one of the extracted e-mails is set as a processing target, and a pair of the e-mail address of the e-mail to be processed and the e-mail address of the e-mail transmission source is output to the permission unit 21. .

  The permission unit 21 determines whether or not to permit transmission based on the combination of the destination e-mail address and the source e-mail address input from the e-mail transmission control unit 19. Specifically, in the association records included in the association data 33 stored in the HDD 105, the destination email address and the source address input from the email transmission control unit 19 are the destination addresses. If the association record set in each of the field and the source address field is included, transmission is permitted. Otherwise, transmission is not permitted. When permitting the transmission, the permission unit 21 outputs a permission signal permitting the transmission of the e-mail to the e-mail transmission control unit 19.

  When the permission signal is input from the permission unit 21, the email transmission control unit 19 sends the network I / F 104 to the email that has been set as the processing target and the PC 201 to 205 that has transmitted the transmission request. Send through.

  The permission unit 21 is associated with the transmission source e-mail address and the transmission destination e-mail address by the association data 23 among the e-mails 31 received by the e-mail reception control unit 11 and stored in the HDD 105. Since transmission of only an e-mail is permitted, an e-mail in which the e-mail address of the transmission source is not associated with the e-mail address of the transmission destination by the association data 23 is not transmitted. For this reason, it is possible to avoid sending junk mail.

  FIG. 5 is a flowchart showing an example of the flow of the e-mail delivery process. Referring to FIG. 5, CPU 101 determines whether or not an e-mail has been received (step S01). If the e-mail is received, the process proceeds to step S02; otherwise, the process proceeds to step S08.

  In step S02, the received e-mail is stored in HDD 105. In the next step S03, it is determined whether or not the transmission source address and the transmission destination address included in the received electronic mail are associated with each other. Specifically, in the association record included in the association data 33, the transmission destination email address included in the received email is set in the transmission destination address field, and the transmission source email address is It is determined whether or not the association record set in the source address field is included. If it is determined that they are associated, the process proceeds to step S08; otherwise, the process proceeds to step S04.

  In step S04, a retransmission request is transmitted to the transmission source of the received electronic mail. The retransmission request is a related electronic mail related to the received electronic mail, and the electronic mail address of the transmission source of the received electronic mail is set as the destination address of the related electronic mail. The related e-mail is a message for indicating a resend request, for example, a message such as “The e-mail sent earlier is sent if you reply to this e-mail, but it will not be sent unless you reply.” including. As the source email address of the related email, the destination email address of the received email is set. Note that an e-mail address assigned to the e-mail server 100 may be set.

  In the next step S05, it is determined whether or not a response to the related electronic mail transmitted in step S04 has been received. The response here is a reply e-mail returned to the related e-mail. If a reply e-mail has been received, the process proceeds to step S07; otherwise, the process proceeds to step S06. In step S06, it is determined whether or not a predetermined time has elapsed since the retransmission request was transmitted. If the predetermined time has not elapsed, the process returns to step S05, and if the predetermined time has elapsed, the process proceeds to step S07.

  In step S07, an association record in which the transmission source address and the transmission destination address are associated is generated and added to the association data 23 stored in the HDD 105. If the reply e-mail is not received within a predetermined time after the related e-mail is transmitted in step S04, the user who has transmitted the e-mail received in step S01 is determined to be a malicious user and generates an associated record. do not do.

  When the association record is stored in the association data 23, the transmission source email address is associated with the transmission destination email address. When the user who gives an instruction to send a reply e-mail creates and sends another e-mail next, the e-mail is received in step S01, but the processes in steps S04 to S06 are not executed. For this reason, since it is only necessary to send a reply e-mail to the related e-mail once, the operation is simple.

  In step S08, it is determined whether a distribution request has been received. If a distribution request has been received, the process proceeds to step S08; otherwise, the process returns to step S01. Here, a case where the user B inputs an operation for instructing the PC 201 to download an e-mail will be described as an example. The PC 201 transmits a distribution request to the e-mail server 100 when an e-mail download instruction is input. The communication protocol in this case is known as POP or IMAP. This distribution request includes information for specifying the electronic mail address assigned to the user B.

  In step S09, an e-mail in which the same e-mail address as the e-mail address specified in the information included in the distribution request received in step 08 is set as a destination address is stored in the HDD 105. Extract from 31.

  Then, one email to be processed is selected from the emails extracted in step S09. Next, it is determined whether or not a transmission source address and a transmission destination address included in the extracted electronic mail are associated with each other. Specifically, in the association record included in the association data 33, the transmission destination email address included in the extracted email is set in the transmission destination address field, and the transmission source email address is If the association record set in the source address field is included, it is determined that it is associated. If it is not included, it is determined that it is not associated. If it is determined that they are associated, the process proceeds to step S12; otherwise, the process returns to step S10.

  In step S12, the electronic mail selected as the processing target is transmitted to the PC 201 that has transmitted the distribution request. Only e-mails that have the same e-mail address as the e-mail address associated with the e-mail address of the transmission destination by the association data 23 are transmitted, and the e-mail set as the transmission source is related. Since the e-mail not associated with the destination e-mail address by the attached data 23 is not transmitted, it is possible to prevent the junk mail from being transmitted.

  In the next step S13, it is determined whether or not there is an unprocessed e-mail to be set as a process target next. If there is an unprocessed electronic mail, the process returns to step S10. If not, the process returns to step S01.

  As described above, the e-mail server 100 according to the present embodiment transmits an e-mail as a destination if the e-mail address of the transmission source included in the received e-mail is associated with the e-mail address of the transmission destination. The e-mail address is transmitted, but if the e-mail address of the transmission source included in the e-mail is not associated with the e-mail address of the transmission destination, the e-mail is not transmitted to the e-mail address of the transmission destination. For this reason, it is possible to select and send electronic mail.

  In addition, if the source email address included in the received email is not associated with the destination email address included in the received email, the source email included in the received email Send the related e-mail address to the e-mail address, and receive the reply e-mail to the related e-mail, the e-mail address of the sender included in the received e-mail is sent to the destination of the received e-mail Associate with an email address. For this reason, the previously received electronic mail can be transmitted. In addition, the sender can associate the destination email address with the email address assigned to him / her by simply performing a reply to the related email.

<Modification>
FIG. 6 is a functional block diagram illustrating an example of functions of the CPU provided in the electronic mail server in the modified example. Referring to FIG. 6, the difference from the functional block diagram shown in FIG. 3 is that response receiving unit 17A included in association unit 13A is changed and authentication unit 18 is added. Hereinafter, differences from the functional block diagram shown in FIG. 3 will be mainly described.

  Referring to FIG. 6, response receiving unit 17 </ b> A receives a reply email from network I / F 104 when network I / F 104 receives a reply email to a related email from any of PCs 201 to 205. Then, the reply e-mail is output to the authentication unit 18.

  The authentication unit 18 extracts a keyword from the reply e-mail, and determines whether or not the extracted keyword matches a keyword associated with the e-mail destination address of the e-mail input from the e-mail reception control unit 11. to decide. User data for associating an e-mail address with a keyword is stored in the HDD 105, and a keyword associated with an e-mail destination address of an e-mail input from the e-mail reception control unit 11 is extracted from the reply e-mail. It is determined whether or not the keyword matches. The authentication unit 18 generates an association record from the email address of the transmission destination of the email input from the email reception control unit 11 and the email address of the transmission source if the two match, and the generated association record Is added to the associated data 23 stored in the HDD 105 and stored.

  FIG. 7 is a diagram illustrating an example of a format of a user record. Referring to FIG. 7, the user record includes a destination address field and a keyword field. An email address is set in the destination address field, and a keyword is set in the keyword field. The keyword is preferably determined by a user to whom an e-mail address set in the destination address field is assigned.

  FIG. 8 is a flowchart showing an example of the flow of the e-mail delivery process in the modification. Referring to FIG. 8, the difference from the electronic mail delivery process shown in FIG. 5 is that step S05A is added between step S05 and step S07. The other processes are the same as those shown in FIG. 5, and therefore description thereof will not be repeated here.

  In step S05A, it is determined whether or not the reply e-mail to the related e-mail received as a response in step S05 includes a predetermined keyword. If the reply e-mail includes a keyword, the process proceeds to step S07; otherwise, the process proceeds to step S08. Specifically, a keyword associated with user data is acquired by the email address of the sender of the email received in step S01, and whether or not the acquired keyword matches the keyword included in the reply email Judging. When the reply e-mail includes a predetermined keyword, an associated record is generated in step S07. Therefore, when the reply e-mail is not received or when the received reply e-mail does not contain the keyword No association record is generated. For this reason, it is possible to transmit only an e-mail generated by a person who knows the keyword, and to prevent an e-mail generated by a person who does not know the keyword from being transmitted.

  According to the e-mail server 100 in the modified example, only a person who knows the keyword can describe the keyword in the reply e-mail. Therefore, the e-mail address assigned to the person who knows the keyword is sent to the destination address by the association data 23. Associate with an email address. For this reason, it is possible to transmit only an e-mail generated by a person who knows the keyword, and to prevent an e-mail generated by a person who does not know the keyword from being transmitted.

  The keyword is determined in advance in association with each email address, but may be determined in advance in the email server 100.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a figure showing the whole electronic mail distribution system outline in one of the embodiments of the present invention. It is a block diagram which shows an example of the outline | summary of the hardware constitutions of the electronic mail server in this Embodiment. It is a functional block diagram which shows an example of the function of CPU with which an electronic mail server is provided with the information memorize | stored in HDD. It is a figure which shows an example of the format of an associated record. It is a flowchart which shows an example of the flow of an email delivery process. It is a functional block diagram which shows an example of the function of CPU with which the electronic mail server in a modification is provided. It is a figure which shows an example of the format of a user record. It is a flowchart which shows an example of the flow of the email delivery process in a modification.

Explanation of symbols

  11 E-mail reception control unit, 13 association unit, 15 retransmission request unit, 17 response reception unit, 19 e-mail transmission control unit, 21 permission unit, 21A permission unit, 31 e-mail, 33 association data, 33A association data , 100 E-mail server, 101 CPU, 102 ROM, 103 RAM, 104 network I / F, 105 HDD, 106 display unit, 107 operation unit, 201-205 PC.

Claims (5)

Receiving means for receiving e-mail;
The transmission of the received e-mail is performed on the condition that the e-mail address of the transmission source included in the received e-mail is associated with the e-mail address of the transmission destination included in the received e-mail. Permission means to allow,
Transmitting means for transmitting one of the received e-mails permitted to be transmitted by the permission means;
An electronic device comprising: association means for associating the e-mail address of the transmission source with the e-mail address of the transmission destination included in the received e-mail when a predetermined e-mail satisfying a predetermined condition is received; Mail delivery device. The associating means, when the e-mail address of the transmission source included in the received e-mail is not associated with the e-mail address of the transmission destination, of the transmission source included in the received e-mail Re-transmission request means for transmitting a related e-mail related to the received e-mail to an e-mail address;
The e-mail delivery device according to claim 1, wherein a reply e-mail to the related e-mail transmitted by the retransmission request unit is received as the predetermined e-mail.   The associating means sets the transmission source email address to the transmission destination email address included in the received email, on the condition that the reply email includes a predetermined keyword. The electronic mail delivery apparatus according to claim 2, which is associated. Receiving an email; and
The transmission of the received e-mail is performed on the condition that the e-mail address of the transmission source included in the received e-mail is associated with the e-mail address of the transmission destination included in the received e-mail. The steps to allow,
Sending the received e-mail that is permitted to be transmitted in the permitting step;
Associating the e-mail address of the transmission source with the e-mail address of the transmission destination included in the received e-mail when a predetermined e-mail satisfying a predetermined condition is received. . Receiving an email; and
The transmission of the received e-mail is performed on the condition that the e-mail address of the transmission source included in the received e-mail is associated with the e-mail address of the transmission destination included in the received e-mail. The steps to allow,
Sending the received e-mail that is permitted to be transmitted in the permitting step;
When a predetermined e-mail satisfying a predetermined condition is received, associating the e-mail address of the transmission source with the e-mail address of the transmission destination included in the received e-mail; Mail delivery program.

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