JP3880577B2 - E-mail server system, e-mail delivery system, e-mail delivery method, program, and recording medium - Google Patents

Description

  The present invention relates to an e-mail server system, an e-mail distribution system, an e-mail distribution method, a program, and a recording medium, and in particular, an e-mail server system, an e-mail distribution system, and an e-mail distribution capable of reducing junk mail The present invention relates to a method, a program, and a recording medium.

  In recent years, with the widespread use of mobile phones that can receive electronic mail (hereinafter referred to as “mobile phones”), the electronic mail server carries electronic mail (hereinafter referred to as “junk mail”) that is not desired by the user of the mobile phone. A lot of situations have happened to send to the phone.

  Due to the increase in spam mail, an electronic mail server capable of preventing transmission of spam mail to a mobile phone has been desired. Currently, electronic mail servers with anti-spam mail countermeasures have been put into practical use.

  FIG. 5 is a block diagram showing a conventional e-mail delivery system having an e-mail server with anti-spam measures taken.

  In FIG. 5, a conventional electronic mail distribution system includes a mail transmission terminal 51 capable of transmitting an electronic mail, a mail server 52 for the mail transmission terminal 51, and a mobile phone 53 capable of receiving an electronic mail. And a mail server 54 for the mobile phone 53. For example, the mail server 52 is managed by the communication company a55, and the mail server 54 is managed by the communication company b56.

  The mail server 54 includes a database 54a. The database 54 a records spam mail determination conditions set by the user of the mobile phone 53. As the junk mail determination condition, for example, a mail address of a sender that the mobile phone 53 refuses to receive is used.

  For example, when an e-mail specifying the e-mail address of the mobile phone 53 as a destination e-mail address is transmitted from the e-mail transmission terminal 51, the mail server 52 sends the e-mail transmitted from the e-mail transmission terminal 51 to the mail server 54. Send.

  The mail server 54 detects the mail address of the mail transmission terminal 51 from the electronic mail transmitted from the mail transmission terminal 51 via the mail server 52.

  If the detected mail address is a mail address recorded in the database 54 a and not rejected by the mobile phone 51, the mail server 54 sends an email sent from the mail sending terminal 51 via the mail server 52. Is transmitted to the mobile phone 53.

  On the other hand, when the detected e-mail address is an e-mail address that the mobile phone 51 recorded in the database 54a refuses to receive, the e-mail server 54 is transmitted from the e-mail transmission terminal 51 via the e-mail server 52. The e-mail is not transmitted to the mobile phone 53.

  Further, in Patent Document 1 (Japanese Patent Laid-Open No. 2002-281091), as a junk mail determination condition recorded in the database 54a shown in FIG. A mail server system capable of setting a predetermined keyword included in an e-mail is described. According to the mail server system described in Patent Document 1, the user of the mobile phone can refuse to receive an email containing a predetermined keyword set by the user himself / herself.

Patent Document 2 (Japanese Patent Application Laid-Open No. 2003-224605) stores a pair of a mobile phone mail address and a predetermined character string set by a user of the mobile phone, and is extracted from the received e-mail. Describes a mail server that sends a received e-mail to a mobile phone only when the mail address and character string pair matches the mobile phone mail address and character string set by the user .
JP 2002-281091 A JP 2003-224605 A

  However, in the e-mail delivery system as shown in FIG. 5, for example, if the address of the sender of the junk mail is changed, the junk mail reaches the mobile phone.

  In addition, in the mail server described in Patent Document 1 and the mail server described in Patent Document 2, only the recipient who is damaged by receiving the junk mail has a condition for specifying an e-mail to be rejected. Cannot register with the mail server. Therefore, the recipient himself must always perform the troublesome task of registering in the mail server the conditions for specifying the e-mail to be rejected.

  The object of the present invention is to reduce the frequency with which a mobile phone receives junk mail even if the user of the mobile phone does not perform the troublesome task of registering in the mail server the conditions for specifying an e-mail to be rejected. To provide an e-mail server, an e-mail distribution system, an e-mail distribution method, a program, and a recording medium that can be lowered.

  In order to achieve the above object, an e-mail server system of the present invention is an e-mail server system that distributes e-mails having a mail address of a mobile phone as a transmission destination to the mobile phone. A recording unit that records the address and the telephone number of the mobile phone in association with each other, and a receiving unit that receives an e-mail addressed to the e-mail address of the mobile phone and a telephone number transmitted from the e-mail source And the e-mail is transmitted to the mobile phone only when the mail address of the mobile phone that is the destination of the e-mail is associated with the telephone number received by the receiving unit in the recording unit And an e-mail transmission unit.

  The e-mail delivery method of the present invention is an e-mail delivery method performed by an e-mail server system that delivers an e-mail addressed to the e-mail address of a mobile phone to the mobile phone, the e-mail address of the mobile phone And a recording step of associating and recording the telephone number of the mobile phone with the recording unit, and receiving an e-mail addressed to the e-mail address of the mobile phone and a telephone number transmitted from the e-mail transmission source Only when the recording step associates the e-mail address of the mobile phone that is the destination of the e-mail received in the receiving step with the telephone number received in the receiving step, An e-mail transmission unit for transmitting to the mobile phone.

  According to the above invention, the received e-mail is transmitted only when the mail address and the telephone number of the mobile phone as the transmission destination transmitted from the e-mail transmission source are associated in the recording unit. As a mobile phone. For this reason, if the transmitting side who wants to send an e-mail to the mobile phone does not know the e-mail address of the mobile phone and the telephone number of the mobile phone, the e-mail cannot be sent to the mobile phone.

  In general, it is difficult to guess the phone number of a mobile phone from the mail address of the mobile phone and to guess the mail address of the mobile phone from the phone number of the mobile phone. Therefore, it is difficult for a person who wants to send spam mail to an unspecified number of mobile phones to know the mail address of the mobile phone and the phone number of the mobile phone, and sends spam mail to an unspecified number of mobile phones. become unable.

  Also, since the mobile phone mail address and the mobile phone number are managed by the mobile phone operator side, the mobile phone operator side must provide the mobile phone mail address and the mobile phone number. Can be recorded in the recording unit in association with each other. For this reason, the user of the mobile phone does not have to perform an operation of associating the mail address of the mobile phone with the telephone number of the mobile phone and recording it in the recording unit. Therefore, it is less necessary for the user of the mobile phone to perform the troublesome work of setting conditions for refusing reception of junk mail.

  Further, in the above e-mail server system, when the receiving unit receives an e-mail including the e-mail address of the mobile phone as the transmission destination and the e-mail address of the transmission source as the e-mail, the receiving unit receives the e-mail. A detecting unit for detecting the e-mail address of the transmission source from e-mail, and telephone number request information for requesting the telephone number of the mobile phone set as the transmission destination to the e-mail address of the transmission source detected by the detecting unit It is preferable that the receiving unit receives a telephone number transmitted from the mail address of the transmission source.

  Further, in the electronic mail delivery method, the receiving step includes an electronic mail receiving step of receiving an electronic mail including the electronic mail address of the mobile phone as the transmission destination and the electronic mail address of the transmission source as the electronic mail, A detection step of detecting the email address of the transmission source from the email received in the email reception step, and requesting the telephone number of the mobile phone as the transmission destination to the email address of the transmission source detected in the detection step It is preferable that the transmission step further includes a transmission step of transmitting a telephone number requesting information to the effect, and the reception step further includes a telephone number reception step of receiving a telephone number transmitted from the mail address of the transmission source.

  According to the above invention, the telephone number request information for requesting the telephone number of the mobile telephone set as the transmission destination is transmitted to the mail address of the transmission source. The transmission side can transmit the telephone number of the mobile phone according to the telephone number request information. For this reason, it becomes possible to reduce the inconvenience that the e-mail does not reach the transmission destination when the transmitting side forgets to transmit the telephone number of the mobile phone.

  The e-mail delivery system of the present invention includes a mobile phone, a sender terminal that transmits an e-mail and a telephone number destined for the mobile phone, and the e-mail server system.

  Also, the electronic mail delivery method of the present invention includes a mobile phone, a sender terminal for sending an electronic mail and a telephone number to the mobile phone, and an electronic mail server system for delivering the electronic mail to the mobile phone. The electronic mail distribution system includes the electronic mail distribution system, and the electronic mail distribution system performs the electronic mail distribution method.

  According to said invention, in an electronic mail delivery system, it becomes possible to show an effect similar to the above.

  The program of the present invention is a program for causing a computer to execute a distribution process for distributing an e-mail addressed to a mail address of a mobile phone to the mobile phone, wherein the mail address of the mobile phone and the mobile phone A recording process for associating a telephone number with a recording unit, a receiving process for receiving an e-mail addressed to the e-mail address of the mobile phone and a telephone number transmitted from the e-mail transmission source; The e-mail is transmitted to the mobile phone only when the mail address of the mobile phone that is the destination of the e-mail received in the receiving process is associated with the telephone number received in the receiving process in the recording unit. And a distribution process including an electronic mail transmission process to be executed.

  In the above program, the receiving process includes an e-mail receiving process for receiving an e-mail including the e-mail address of the mobile phone as the transmission destination and the e-mail address of the transmission source as the e-mail. A detection process for detecting the sender's mail address from the e-mail received in step (b), and requesting the telephone number of the mobile phone as the destination to the sender's mail address detected in the detection process. A transmission process for transmitting telephone number request information, and the reception process further includes a telephone number reception process for receiving a telephone number transmitted from the mail address of the transmission source.

  The recording medium of the present invention is a computer-readable recording medium on which the program is recorded.

  According to the program of the present invention and the recording medium of the present invention, it is possible to cause a computer to execute the e-mail delivery method.

  According to the present invention, the received e-mail is used as a transmission destination only when the mail address and the telephone number of the mobile phone as the transmission destination transmitted from the e-mail transmission source are associated in the recording unit. Send to the email address of your mobile phone. For this reason, if the transmission side that transmits the e-mail to the mobile phone does not know the mail address and telephone number of the mobile phone, the e-mail cannot be transmitted to the mobile phone.

  In general, it is difficult to guess the phone number of a mobile phone from the mail address of the mobile phone and to guess the mail address of the mobile phone from the phone number of the mobile phone. Therefore, according to the present invention, it is difficult for a person who intends to send a spam mail to an unspecified number of mobile phones to know the mail address of the mobile phone and the telephone number of the mobile phone. Unable to send junk e-mail to mobile phones.

  Also, since the mobile phone mail address and the mobile phone number are managed by the mobile phone operator side, the mobile phone operator side must provide the mobile phone mail address and the mobile phone number. Can be recorded in the recording unit in association with each other. For this reason, the user of the mobile phone does not have to perform an operation of associating the mail address of the mobile phone with the telephone number of the mobile phone and recording it in the recording unit. Therefore, it is less necessary for the user of the mobile phone to perform the troublesome work of setting conditions for refusing reception of junk mail.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing an electronic mail distribution system according to an embodiment of the present invention.

  In FIG. 1, an e-mail delivery system includes a mail sending terminal 1, a mail server 2 for the mail sending terminal 1, a mobile phone 3 capable of sending and receiving e-mail, and an e-mail server system 4. Including. The electronic mail server system 4 includes a database 5 and a mail server 6 for the mobile phone 3.

  The mail transmission terminal 1 can transmit and receive electronic mail. The mail server 2 receives the electronic mail transmitted from the mail transmission terminal 1, and transmits the received electronic mail to the mail server specified by the transmission destination mail address of the electronic mail. The mail server 2 is managed by, for example, the communication company a7.

  The mobile phone 3 is assigned with its own (mobile phone 3) mail address and its own (mobile phone 3) telephone number.

  The electronic mail server system 4 according to an embodiment of the present invention distributes an electronic mail having a mail address assigned to the mobile phone 3 as a transmission destination to the mobile phone 3. The electronic mail server system 4 is managed by the communication company b8.

  The database 5 as a recording unit records information used for spam mail countermeasures. Specifically, the database 5 records the mail address of the mobile phone 3 and the telephone number of the mobile phone 3 in association with each other.

  FIG. 2 is an explanatory diagram showing an example of the mail address 5a of the mobile phone and the telephone number 5b of the mobile phone recorded in association with the database 5. In the example shown in FIG. 2, for each mobile phone managed by the mail server 6, the mail address 5a of the mobile phone and the telephone number 5b of the mobile phone are associated with each other.

  Returning to FIG. 1, the communication company b8 manages the mail address of the mobile phone 3 and the telephone number of the mobile phone 3. Therefore, the work of associating the e-mail address of the mobile phone 3 with the telephone number of the mobile phone 3 and recording it in the database 5 is performed not by the user of the mobile phone 3 but by the communication company b8 (for example, the mail server 6). Is possible.

  In the present embodiment, as information used for spam mail countermeasures, information used for spam mail countermeasures is obtained by using a combination of the mail address of the mobile phone 3 and the telephone number of the mobile telephone 3. It is possible to set not only from the user 3 but also from the communication company b8 side (for example, the mail server 6). Therefore, it is possible to reduce or eliminate the burden on the user of the mobile phone 3 when setting information used for spam mail countermeasures.

  The mail server 6 includes a memory 61 and a CPU 62, and distributes electronic mail to the mobile phone 3. The mail server 6 may include the database 5.

  The memory 61 is a computer-readable recording medium. In the memory 61, a program 61a that defines the operation of the mail server 6 is recorded.

  The CPU 62 as a computer reads the program 61a recorded in the memory 61 and executes various processes according to the read program 61a. In the following, a function realized by the CPU 62 executing the program 61a will be described as a function of the mail server 6.

  FIG. 3 is a functional block diagram showing an example of the functions that the mail server 6 has. 3, the same components as those shown in FIG. 1 are denoted by the same reference numerals.

  In FIG. 3, the mail server 6 includes a transmission / reception unit 6a as a transmission unit and a reception unit, a detection unit 6b, and a control unit 6c as an e-mail transmission unit. The transmission / reception unit 6a, the detection unit 6b, and the control unit 6c are realized by the CPU 62 of the mail server 6 illustrated in FIG. 1 executing the program 61a recorded in the memory 61 of the mail server 6.

  The transmission / reception unit 6a receives an e-mail whose destination is the e-mail address of the mobile phone 3, and a telephone number transmitted from the e-mail transmission source.

  The control unit 6c is received by the transmission / reception unit 6a only when the mail address and the telephone number of the mobile phone 3 that is the transmission destination of the e-mail received by the transmission / reception unit 6a are associated in the database 5. An e-mail is transmitted to the mobile phone 3.

  For example, the transmission / reception unit 6a receives an e-mail including the e-mail address of the mobile phone 3 as a transmission destination and including the e-mail address of the transmission source.

  When the transmission / reception unit 6a receives an email including the email address of the mobile phone 3 and including the email address of the transmission source, the detection unit 6b receives the email of the transmission source from the email received by the transmission / reception unit 6a. Detect the address.

  The control unit 6c causes the transmission / reception unit 6a to transmit the telephone number request information for requesting the telephone number of the mobile phone 3 as the transmission destination to the transmission source mail address detected by the detection unit 6b. The transmission / reception unit 6a receives a telephone number transmitted from the mail address of the transmission source.

  The control unit 6c determines whether or not the e-mail address of the mobile phone 3 that is the transmission destination of the e-mail received by the transmission / reception unit 6a is associated with the telephone number received by the transmission / reception unit 6a in the database 5. .

  The control unit 6c transmits / receives only when the mail address of the mobile phone 3 that is the transmission destination of the e-mail received by the transmission / reception unit 6a and the telephone number received by the transmission / reception unit 6a are associated in the database 5. The electronic mail received by the unit 6a is transmitted to the mobile phone 3.

  Next, the operation will be described.

  FIG. 4 is a flowchart for explaining the operation of the electronic mail delivery system. The operation of the electronic mail delivery system will be described below with reference to FIG.

  The communication company b8 side (for example, the mail server 6) records the mail address of the mobile phone 3 and the telephone number of the mobile phone 3 in the database 5 in association with each mobile phone managed by the communication company b8.

  When an e-mail with the e-mail address of the mobile phone 3 specified as the destination is sent from the mail sending terminal 1 (step 41), the mail server 2 sends the e-mail sent from the mail sending terminal 1 to the mail server 6 (Step 42). The electronic mail transmitted from the mail transmission terminal 1 includes the mail address of the mail transmission terminal 1 that is the transmission source.

  The transmission / reception unit 6 a of the mail server 6 receives the electronic mail transmitted from the mail server 2.

  When the transmission / reception unit 6a receives an email including the email address of the mobile phone 3 and including the email address of the transmission source, the detection unit 6b receives the email address of the transmission source (specifically, from the email received by the transmission / reception unit 6a). Specifically, the mail transmission terminal 1) is detected.

  The control unit 6c requests telephone number request information for requesting the telephone number of the mobile phone 3 as the transmission destination from the mail address of the transmission source (specifically, the mail transmission terminal 1) detected by the detection unit 6b. Is transmitted from the transmitting / receiving unit 6a.

  The transmitting / receiving unit 6a requests the telephone number of the mobile phone 3 that is the destination of the e-mail from the mail transmitting terminal 1 by transmitting the telephone number request information to the mail transmitting terminal 1 via the mail server 2 (step S1). 43).

  An e-mail sender using the mail sending terminal 1 operates the mail sending terminal 1 to input the telephone number of the mobile phone 3 to which the e-mail is sent to the mail sending terminal 1.

  The mail transmission terminal 1 notifies the input telephone number to the mail server 6 via the mail server 2 (step 44).

  The transmission / reception unit 6a receives a telephone number transmitted from the mail address of the transmission source (specifically, the mail transmission terminal 1).

  The control unit 6c checks whether or not the mail address of the mobile phone 3 that is the transmission destination of the electronic mail received by the transmission / reception unit 6a and the telephone number received by the transmission / reception unit 6b are associated in the database 5. (Step 45).

  In step 45, when the mail address of the mobile phone 3 that is the transmission destination of the electronic mail received by the transmission / reception unit 6a and the telephone number received by the transmission / reception unit 6b are associated in the database 5, the control unit 6c Then, the electronic mail received by the transmission / reception unit 6a is transmitted to the mail address of the mobile phone 3 (step 46).

  In step 45, when the mail address of the mobile phone 3 that is the transmission destination of the electronic mail received by the transmission / reception unit 6a and the telephone number received by the transmission / reception unit 6b are not associated in the database 5, the control unit 6c Then, the transmission / reception unit 6a transmits again the telephone number request information for requesting the telephone number of the mobile phone 3 as the transmission destination to the transmission source mail address detected by the detection unit 6b.

  The transmission / reception unit 6a re-requests the telephone number of the mobile phone 3 that is the transmission destination of the electronic mail from the mail transmission terminal 1 by transmitting the telephone number request information to the mail transmission terminal 1 again via the mail server 2. (Step 47).

  An e-mail sender who owns the mail sending terminal 1 operates the mail sending terminal 1 and inputs the telephone number of the mobile phone 3 to which the e-mail is sent to the mail sending terminal 1.

  The mail transmission terminal 1 notifies the mail server 6 of the input telephone number via the mail server 2.

  The transmission / reception unit 6a newly receives a telephone number transmitted from the mail address of the transmission source (specifically, the mail transmission terminal 1).

  The control unit 6c determines whether or not the e-mail address of the mobile phone 3 that is the transmission destination of the e-mail received by the transmission / reception unit 6a and the telephone number newly received by the transmission / reception unit 6b are associated in the database 5. Confirm (step 48).

  In step 48, if the database 5 associates the mail address of the mobile phone 3 that is the transmission destination of the electronic mail received by the transmission / reception unit 6a with the telephone number newly received by the transmission / reception unit 6b, the control unit 6c transmits the electronic mail received by the transmission / reception unit 6a to the mail address of the mobile phone 3 (step 46).

  In step 48, if the database 5 does not associate the mail address of the mobile phone 3 that is the transmission destination of the electronic mail received by the transmission / reception unit 6a with the telephone number newly received by the transmission / reception unit 6b, the control unit 6c determines that the e-mail sender cannot specify the e-mail recipient, and does not send the e-mail received by the transmission / reception unit 6a to the mobile phone 3 (step 49), and ends the operation.

  According to the present embodiment, when the e-mail sender cannot identify the e-mail recipient, the e-mail cannot be transmitted to the e-mail recipient. Since spam senders who try to send e-mail to an unspecified number of mobile phones cannot identify e-mail recipients, spam messages that try to send e-mail to an unspecified number of mobile phones can be prevented Is possible.

  Specifically, the received e-mail is sent as the destination only when the mail address and the telephone number of the mobile phone as the destination sent from the sender of the e-mail are associated in the database 5. Send to the email address of the mobile phone. For this reason, if the transmission side that transmits the e-mail to the mobile phone does not know the mail address and telephone number of the mobile phone, the e-mail cannot be transmitted to the mobile phone.

  In general, it is difficult to guess the phone number of a mobile phone from the mail address of the mobile phone and to guess the mail address of the mobile phone from the phone number of the mobile phone. Therefore, it is difficult for a person who wants to send spam mail to an unspecified number of mobile phones to know the mail address of the mobile phone and the phone number of the mobile phone. Cannot send.

  Also, since the mobile phone mail address and the mobile phone number are managed by the mobile phone operator side, the mobile phone operator side must provide the mobile phone mail address and the mobile phone number. Can be recorded in the database 5 in association with each other. For this reason, it becomes unnecessary for the user of the mobile phone to perform the operation of associating the mail address of the mobile phone with the telephone number of the mobile phone and recording it in the database 5.

  Accordingly, it is less necessary for the user of the mobile phone to perform the troublesome work of associating the mail address of the mobile phone with the telephone number of the mobile phone and recording it in the database 5 in order to refuse the reception of the junk mail.

  Further, according to the present embodiment, the telephone number request information for requesting the telephone number of the mobile phone set as the transmission destination is transmitted to the mail address of the transmission source. The transmission side can transmit the telephone number of the mobile phone according to the telephone number request information. For this reason, it becomes possible to reduce the inconvenience that the e-mail does not reach the transmission destination when the transmitting side forgets to transmit the telephone number of the mobile phone.

  In the embodiment described above, the illustrated configuration is merely an example, and the present invention is not limited to the configuration.

  For example, the transmission side may simultaneously transmit an e-mail and a telephone number whose destination is the e-mail address of the mobile phone.

It is the block diagram which showed the electronic mail delivery system of one Example of this invention. It is explanatory drawing which showed an example of the information recorded on the database 5 shown in FIG. It is the block diagram which showed an example of the electronic mail delivery system shown in FIG. It is a flowchart for demonstrating operation | movement of the electronic mail delivery system shown in FIG. It is the block diagram which showed an example of the conventional electronic mail delivery system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mail transmission terminal 2 Mail server 3 Mobile phone 4 E-mail server system 5 Database 6 Mail server 61 Memory 62 CPU
6a Transmission / reception unit 6b Detection unit 6c Control unit

Claims (9)

An e-mail server system for delivering an e-mail addressed to the e-mail address of a mobile phone to the mobile phone,
A recording unit that records the mail address of the mobile phone and the telephone number of the mobile phone in association with each other;
A receiver that receives an e-mail addressed to the e-mail address of the mobile phone and a telephone number transmitted from the e-mail source;
An e-mail that transmits the e-mail to the mobile phone only when the e-mail destination address of the mobile phone and the telephone number received by the receiving unit are associated in the recording unit An e-mail server system including a transmission unit. In the electronic mail server system according to claim 1,
When the receiving unit receives an e-mail that includes the e-mail address of the mobile phone as the transmission destination and includes the e-mail address of the transmission source, the e-mail address of the transmission source from the e-mail received by the reception unit A detection unit for detecting,
A transmission unit that transmits telephone number request information for requesting the telephone number of the mobile phone set as the transmission destination to the mail address of the transmission source detected by the detection unit;
The e-mail server system, wherein the receiving unit receives a telephone number transmitted from the e-mail address of the transmission source. A mobile phone,
A sender terminal for sending an e-mail and a telephone number to the mobile phone as a destination;
An e-mail delivery system including the e-mail server system according to claim 1. An e-mail delivery method performed by an e-mail server system that delivers an e-mail addressed to the e-mail address of a mobile phone to the mobile phone,
A recording step of associating the e-mail address of the mobile phone and the telephone number of the mobile phone in a recording unit;
A receiving step of receiving an e-mail addressed to the e-mail address of the mobile phone and a telephone number transmitted from the e-mail source;
The e-mail is sent to the mobile phone only when the mail address of the mobile phone that is the destination of the e-mail received in the receiving step is associated with the telephone number received in the receiving step in the recording unit. An e-mail delivery method including an e-mail sending unit for sending. The e-mail delivery method according to claim 4.
The receiving step includes an e-mail receiving step of receiving an e-mail that includes the e-mail address of the mobile phone as the transmission destination and the e-mail address of the transmission source
A detection step of detecting the email address of the transmission source from the email received in the email reception step;
A transmission step of transmitting telephone number request information for requesting the telephone number of the mobile phone set as the transmission destination to the email address of the transmission source detected in the detection step;
The e-mail delivery method, wherein the receiving step further includes a telephone number receiving step of receiving a telephone number transmitted from the e-mail address of the transmission source. E-mail performed by an e-mail delivery system including a mobile phone, a sender terminal that sends e-mail and a telephone number destined for the mobile phone, and an e-mail server system that delivers the e-mail to the mobile phone A delivery method,
An e-mail delivery method in which the e-mail delivery system performs the e-mail delivery method according to claim 4 or 5. A program for causing a computer to execute a distribution process for distributing an e-mail addressed to a mail address of a mobile phone to the mobile phone,
A recording process in which a mail address of the mobile phone and a telephone number of the mobile phone are associated with each other and recorded in a recording unit;
A receiving process for receiving an e-mail addressed to the e-mail address of the mobile phone and a telephone number transmitted from the e-mail source;
The e-mail is sent to the mobile phone only when the mail address of the mobile phone that is the destination of the e-mail received in the receiving process is associated with the telephone number received in the receiving process in the recording unit. A program for causing a computer to execute a distribution process including an e-mail transmission process to be transmitted. The program according to claim 7,
The reception process includes an email reception process for receiving an email including the email address of the mobile phone as the transmission destination and the email address of the transmission source as the email,
A detection process for detecting a mail address of the transmission source from the email received in the email reception process;
A transmission process for transmitting telephone number request information for requesting the telephone number of the mobile phone set as the transmission destination to the mail address of the transmission source detected in the detection process;
The reception process further includes a telephone number reception process for receiving a telephone number transmitted from the mail address of the transmission source.   A computer-readable recording medium in which the program according to claim 7 or the program according to claim 8 is recorded.

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