JP5495983B2 - Mail transfer method and system using temporary account for existing account - Google Patents

Description

  The present invention relates to a technique for transferring electronic mail. In particular, the present invention relates to a technique for converting a mail destination address or source address by a server connected to a network.

  As an e-mail transfer system in a mobile phone, there is an e-mail address automatic conversion technique (see, for example, Patent Document 1). According to this technology, even when the carrier (communication company) of the mobile phone is changed, the user can continuously use the mail address based on the domain of the previous carrier. That is, there is no need to change the mail address. In addition, the present invention can also be applied to a use in which a user converts a public mail address that is disclosed to a third party and a private mail address for properly using different mail servers.

  FIG. 1 is a system configuration diagram in the prior art.

  According to FIG. 1, the terminal 1A is transmitting mail toward the terminal 1B. Terminal 1A is connected to the Internet via gateway 2A, and terminal 1B is connected to the Internet via gateway 2B. Here, the mail transfer system includes a mail server 3a on the terminal 1A side, a mail server 3b on the terminal 1B side, and a mail address conversion server 4.

  The terminal 1A transmits mail to the mail server 3a via the gateway 2A. For example, it is assumed that a user who operates the terminal 1A uses a private mail address (xxx@kddi.com) for a public mail address (tasaka@auone.jp). In this case, if the sender address is a private mail address, this mail includes the sender address (xxx@kddi.com) and the destination address (sato@auone.jp).

  The mail server 3a functions as an SMTP (Simple Mail Transfer Protocol) server, and transmits the mail received from the terminal 1A to the mail address conversion server 4.

  The mail address conversion server 4 converts the source address of the received mail from the private mail address (xxx@kddi.com) to the public mail address (tasaka@auone.jp), and transfers the mail.

  This mail is received and stored by the mail server 3b functioning as a POP (Post Office Protocol) server. And the terminal 1B can acquire the mail by accessing the mail server 3b via the gateway 2B.

  On the other hand, the terminal 1B can transmit an email having a public mail address (tasaka@auone.jp) as a destination address toward the terminal 1A. The mail address conversion server 4 converts the destination address of the received mail into a private mail address (xxx@kddi.com) and forwards the mail.

  As another conventional technique, there is a technique in which a character string that has nothing to do with an existing famous domain name is used as a mail address by interposing a specific mail distribution server (see, for example, Patent Document 2). Specifically, according to this technology, the terminal converts the mail address owned by the user into the domain of the specific mail distribution server. The terminal transmits a mail having the mail address as a source address and a predetermined character string added to the end of the destination address to the specific mail distribution server. For the mail, the specific mail delivery server converts the source mail address into a predetermined character string, and deletes the predetermined character string at the end of the destination mail address. Then, the specific mail delivery server transmits the mail toward the destination mail address. According to this technique, it is possible to prevent the other party's terminal from knowing the source address that causes spam mail.

JP 2008-123391 A JP 2006-080691 A

  According to the technique described in Patent Document 1, the mail address conversion server has an address conversion table, and registers a private mail address and a public mail address in association with each other. In this case, the address conversion table is updated by the carrier operator. However, when the operator needs to know the public / private mail address in advance and the mail address is frequently changed, the operator's update work becomes troublesome.

  According to the technique described in Patent Document 2, a public / private mail address can be registered in advance in a mail address conversion server from a terminal based on a user operation. However, after all, the user needs to register the public / private mail address in advance using the terminal, and the user's own update work becomes troublesome.

  Further, in an emergency such as a disaster, an existing mail server may be down or a load may be concentrated on a specific mail server. Therefore, there is a need to temporarily install a mail server, but in this case, since the domain is generally changed, there is a need to change the mail address.

  Therefore, the present invention provides a mail transfer system and method that can install a different mail server temporarily and facilitate the user's own account registration operation even when the temporary account is set or changed. The purpose is to do.

According to the present invention, a mail transfer method in a system for transferring mail between terminals,
The system includes a first temporary mail management server (POP (Post Office Protocol ) server) and a first mail management server (SMTP (Simple Mail Transfer Protocol) server) .
A first step in which the first temporary mail management server issues a first temporary count to the first terminal and acquires an existing account from the first terminal;
A second step in which the first temporary mail management server transmits an account registration request including the first temporary account and the existing account to the first mail management server;
A third step in which the first mail management server registers and registers the first temporary account and the account;
When the first mail management server receives a mail received from the second terminal and the destination address of the mail matches the existing account, the first mail management server converts the destination address into the first temporary account, and the first temporary mail management A fourth step of forwarding to the server;
The temporary mail management server has a fifth step of storing received mail, and the first terminal uses the first temporary account to send the first temporary mail management server to the mail based on the existing account. It is acquired from.

  According to another embodiment of the mail transfer method of the present invention, for the mail received from the first terminal by the first mail management server, when the sender address of the mail matches the first temporary account, It is also preferable to convert the sender address to an existing account and forward the email.

According to another embodiment of the mail transfer method of the present invention,
The mail transfer system further includes a second temporary mail management server and a second mail management server,
When the first terminal moves from a position where it can communicate with the first temporary mail management server to a position where it can communicate with the second temporary mail management server,
A sixth step in which the second temporary mail management server issues a second temporary count to the first terminal and obtains an existing account from the first terminal;
A seventh step in which the second temporary mail management server transmits an account registration request including the second temporary account and the existing account to the second mail management server;
An eighth step in which the second mail management server associates and registers the second temporary account and the existing account;
A ninth step in which the second mail management server transmits an account registration request including the second temporary account and the existing account to the first mail management server;
When the first mail management server receives a mail received from the second terminal and the destination address of the mail matches the existing account, the first mail management server converts the destination address into a second temporary account, and the second mail management server A tenth step of sending to
An eleventh step in which the second mail management server transmits the mail received from the first mail management server to the second temporary mail management server;
The second temporary mail management server has a thirteenth step of accumulating the received mail, and the first terminal uses the second temporary account to send the second temporary account to the mail based on the existing account. It is also preferable to obtain from a mail management server.

According to another embodiment of the mail transfer method of the present invention,
The sixth step, the second temporary mail management server, the first terminal further acquires the previous first temporary account,
Regarding the seventh step, the second temporary mail management server further includes the first temporary account in the account registration request transmitted to the second mail management server,
For the ninth step, the second mail management server identifies the first mail management server that communicates with the first temporary mail management server that issued the first temporary account based on the first temporary account It is also preferable to do.

According to another embodiment of the mail transfer method of the present invention, between the ninth step and the tenth step,
The first mail management server sending an account deletion request to the first temporary mail management server;
It is also preferable that the first temporary mail management server further includes a step of deleting the first temporary account.

  According to another embodiment of the mail transfer method of the present invention, with respect to the first step and / or the sixth step, the temporary mail management server provides a WWW (World Wide Web) browser of the first terminal to It is also preferable to issue a temporary account and acquire an existing account by transmitting a Web page.

According to the present invention, a mail transfer system for transferring mail between terminals,
A temporary mail management server (POP (Post Office Protocol) server) and a mail management server (SMTP (Simple Mail Transfer Protocol) server) ;
The temporary mail management server
An account acquisition means for issuing a first temporary count to the terminal and acquiring an existing account from the terminal;
A registration request transmitting means for transmitting an account registration request including a temporary account and an existing account to the mail management server;
Mail storage means for storing mail received from the mail management server;
An email forwarding means that allows the device to retrieve email based on an existing account using a temporary account,
The mail management server
When receiving an account registration request, an account registration means for registering a temporary account and an existing account in association with each other;
For email received from the second terminal, if the destination address of the email matches an existing account, account conversion means for converting the destination address into a temporary account;
And a mail transfer means for transferring the mail whose account has been converted.

According to another embodiment of the mail transfer system of the present invention,
It is also preferable that the account conversion means of the mail management server converts the source address of the mail received from the first terminal into an existing account when the source address of the mail matches the first temporary account.

According to another embodiment of the mail transfer system of the present invention,
The mail management server
Server registration request means for transmitting an account registration request including a temporary account and an existing account to another mail management server;
It is also preferable to further include server mail transfer means for converting the destination address of the mail received from the terminal into a temporary account and transmitting it to another mail management server when the destination address of the mail matches the existing account.

According to another embodiment of the mail transfer system of the present invention,
The account acquisition means of the temporary mail management server further acquires the previous temporary account from the terminal,
The registration request transmission means of the temporary mail management server further includes the previous temporary account in the account registration request transmitted to another mail management server,
The mail management server preferably further includes management server specifying means for specifying another mail management server that communicates with the temporary mail management server that issued the temporary account based on the temporary account.

According to another embodiment of the mail transfer system of the present invention,
The mail management server further includes an account deletion request transmission means for transmitting an account deletion request to the temporary mail management server when an account registration request is received from another mail management server,
The temporary mail management server preferably further includes account deletion means for deleting the first temporary account.

  According to another embodiment of the mail transfer system of the present invention, the account acquisition unit of the temporary mail management server issues a temporary account and sends an existing account by transmitting a Web page to the WWW browser of the terminal. It is also preferable to obtain.

  According to the mail transfer system and method of the present invention, a temporary different mail server can be installed, and even when the temporary account is set or changed, the user's own account registration operation is facilitated.

It is a system block diagram in a prior art. It is a 1st system block diagram in this invention. FIG. 3 is a sequence diagram in FIG. 2. It is a 2nd system block diagram in this invention. FIG. 5 is a sequence diagram in FIG. 4. It is a functional block diagram of the temporary mail management server and mail management server in this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 2 is a first system configuration diagram in the present invention.

  According to FIG. 2, the temporary mail management server 5a and the mail management server 6a are provided on the terminal 1A side as compared with FIG. The terminal 1A transmits and receives mail to and from the temporary mail management server 5a via the gateway 2A. The temporary mail management server 5a transmits and receives mail to and from the mail management server 6a. Furthermore, the mail management server 6a transmits and receives mail to and from the mail server 3b on the destination terminal 1B side.

  A “temporary mail management server” may be installed at an evacuation site in the event of a disaster, for example, and is a device that continuously uses mail on a terminal such as a mobile phone or a laptop based on user operations. is there. In such an emergency, the existing mail server may go down or the load may be concentrated on a specific mail server. For this purpose, a temporary mail management server is installed immediately to maintain transmission / reception of mail from the terminal based on user operations.

  Here, the domain of the mail address to be transmitted / received becomes a problem. According to the present invention, the terminal must transfer the mail to a server (mail management server) different from the existing SMTP server. Therefore, the temporary mail management server issues a “temporary account” that is different from the existing account. Then, the terminal transmits an email with the source address as a temporary account.

  Further, the “mail management server” converts the temporary account of the transmission source address into an existing account for the mail received from the temporary mail management server, and further transfers the mail. As a result, the mail is received and stored in the mail server 3b on the destination terminal 1B side.

  FIG. 3 is a sequence diagram in FIG.

(S301) The terminal 1A transmits a temporary account request to the temporary mail management server 5a via the gateway 2A. On the other hand, the temporary mail management server 5a issues a temporary count (for example, xxx@kddi.com) to the terminal 1A. Specifically, a user ID (yyy), a password (??????), and an email address (xxx@kddi.com) are issued. Then, the temporary mail management server 5a responds to the terminal 1A with the temporary account (xxx@kddi.com).

(S302) Next, the temporary mail management server 5a transmits an existing account request to the terminal 1A. On the other hand, the terminal 1A responds to the temporary mail management server 5a with an existing account (for example, tasaka@auone.jp) automatically or based on a user operation. At this time, it is also preferable to include authentication information corresponding to the existing account in the response message.

  S301 and S302 may be such that the temporary mail management server 5a issues a temporary account and acquires an existing account by transmitting a Web page to the WWW (World Wide Web) browser of the terminal 1A. Good.

(S303) Thereby, the temporary mail management server 5a registers the temporary account and the existing account in association with each other.

(S304) Next, the temporary mail management server 5a sends an account registration request including the temporary account (xxx@kddi.com) and the existing account (tasaka@auone.jp) to the mail management server 6a via the gateway 2A. Send.

(S304) The mail management server 6a receives the account registration request, and registers the temporary account and the existing account in association with each other.

[Reception of mail in terminal 1A]
(S311) It is assumed that the terminal 1B transmits a mail toward the terminal 1A. The destination address of the mail is the existing account (tasaka@auone.jp) of the terminal 1A. The mail is received by the mail server 3b via the gateway 2B. The mail server 3b transfers the mail to the mail management server 6a.
(S312) For the mail received from the terminal 1B, the mail management server 6a determines whether or not the destination address of the mail matches the registered existing account. If they match, the email address is converted to a temporary account (xxx@kddi.com). Then, the mail management server 6a transfers the mail to the temporary mail management server 5a via the gateway 2A.
(S313) The temporary mail management server 5a stores the received mail.
(S314) Then, the terminal 1A acquires mail based on the existing account (tasaka@auone.jp) from the temporary mail management server 5a using the temporary account (xxx@kddi.com).

[Sending mail on terminal 1A]
(S321) It is assumed that the terminal 1A transmits a mail toward the terminal 1B. The mail source address is the temporary account (xxx@kddi.com) of the terminal 1A. The mail is transmitted to the temporary mail management server 5a via the gateway 2A.
(S322) The temporary mail management server 5a transfers the mail to the mail management server 6a.
(S323) The mail management server 6a determines whether or not the mail source address of the mail received from the terminal 1A matches the registered temporary account. If they match, the email address is converted to an existing account (tasaka@auone.jp). Then, the mail management server 6a transmits the mail toward the destination address.
(S324) The mail is received and stored by the mail server 3b.
(S325) Then, the terminal 1B can access the mail server 3b and acquire mail based on the existing account (tasaka@auone.jp).

  FIG. 4 is a second system configuration diagram according to the present invention.

  According to FIG. 4, compared with FIG. 2, the terminal 1A based on the user operation has moved to a different domain. At this time, the registration of the previous account still remains in the previous temporary mail management server 5a and the mail management server 6a.

  The terminal 1A after moving transmits / receives mail to / from the new temporary mail management server 5c via the new gateway 2C as in FIG. The temporary mail management server 5c transmits and receives mail to and from the mail management server 6c. Further, the mail management server 6c transmits and receives mail to and from the mail server 3b on the destination terminal 1B side via the previous mail management server 6a.

  FIG. 5 is a sequence diagram in FIG.

(S501) It is assumed that the terminal 1A has moved from a position where it can communicate with the temporary mail management server 5a to a position where it can communicate with the temporary mail management server 5b.

(S511) The terminal 1A transmits a temporary account request to the temporary mail management server 5c via the gateway 2C. On the other hand, the temporary mail management server 5c issues a temporary count (for example, yyy@kddi.com) to the terminal 1A. The temporary mail management server 5c then responds to the terminal 1A with the temporary account (yyy@kddi.com).

(S512) Next, the temporary mail management server 5c transmits an existing account request to the terminal 1A. On the other hand, the terminal 1A returns an existing account (for example, tasaka@auone.jp) to the temporary mail management server 5c automatically or based on a user operation.

(S513) Thereby, the temporary mail management server 5c registers the temporary account and the existing account in association with each other.

(S514) Next, the temporary mail management server 5c sends an account registration request including the temporary account (xxx@kddi.com) and the existing account (tasaka@auone.jp) to the mail management server 6c via the gateway 2C. Send.

(S515) The mail management server 6c receives the account registration request, and registers the temporary account and the existing account in association with each other. The fact that it has been received from the mail management server 6c (for example, the address of the mail management server 6c) is also registered. As a result, the mail that matches the registered temporary account or existing account is controlled to be transmitted to the mail management server 6c.

(S516) The mail management server 6c transmits an account registration request including the temporary account and the existing account to the mail management server 6a.

Here, it is also preferable that the mail management server 6c executes the following steps in order to identify the mail management server 6a.
(S1) In S512, the temporary mail management server 5c further acquires the previous temporary account (xxx.kddi.com) from the terminal 1A.
(S2) In S514, the temporary mail management server 5c further includes the previous temporary account (xxx.kddi.com) in the account registration request transmitted to the mail management server 6c.
(S3) In S515, the mail management server 6c identifies the mail management server 6a that communicates with the temporary mail management server 5a that issued the temporary account based on the temporary account (xxx.kddi.com). .

  When the mail management server 6a receives an account registration request, it checks whether an existing account has already been registered. If already registered, the temporary account corresponding to the existing account is updated. For example, if xxx@kddi.com is associated with tasaka@auone.jp, the account is changed to a new temporary account yyy@kddi.com. At this time, the address of the mail management server 6c is also registered so that the mail corresponding to this account is transferred to the mail management server 6c.

(S517) The mail management server 6a receives the account registration request and registers the temporary account and the existing account. Then, the mail management server 6a transmits an account deletion request to the temporary mail management server 5a via the gateway 2A. As a result, the temporary mail management server 5a deletes the previous account.

(S521) It is assumed that the terminal 1B transmits a mail toward the terminal 1A. The destination address of the mail is the existing account (tasaka@auone.jp) of the terminal 1A. The mail is received by the mail server 3b via the gateway 2B. The mail server 3b transfers the mail to the mail management server 6a.

(S522) For the mail received from the terminal 1B, the mail management server 6a determines whether the destination address of the mail matches the existing account (tasaka@auone.jp). If they match, the mail is transmitted to the mail management server 6c.

(S523) For the mail received from the mail management server 6a, the mail management server 6c determines whether the destination address of the mail matches the registered existing account. If they match, the email address (tasaka@auone.jp) is converted to a temporary account (yyy@kddi.com). Then, the mail management server 6c transfers the mail to the temporary mail management server 5c via the gateway 2C.

(S524) The temporary mail management server 5c stores the received mail.

(S525) Then, the terminal 1A acquires a mail based on the existing account (tasaka@auone.jp) from the temporary mail management server 5c using the temporary account (yyy@kddi.com).

  FIG. 6 is a functional configuration diagram of the temporary mail management server and the mail management server in the present invention.

  According to the temporary mail management server 5 of FIG. 6, the communication interface unit 50, the account acquisition unit 51, the Web server unit 52, the account registration unit 53, the registration request transmission unit 54, the mail storage unit 55, the mail A transfer unit 56 and an account deletion unit 57 are included. These functional components are realized by executing a program that causes a computer mounted on the server to function.

  The account acquisition unit 51 issues a temporary count to the terminal and acquires an existing account from the terminal (see S301 and S302 in FIG. 3 and S511 and S512 in FIG. 5).

  The web server unit 52 transmits the web page from the account acquisition unit 51 to the WWW browser of the terminal. Accordingly, the account acquisition unit 51 issues a temporary account to the terminal and acquires an existing account.

  The account registration unit 53 registers the temporary account and the existing account acquired by the account acquisition unit 51 (see S303 in FIG. 3 and S513 in FIG. 5).

  The registration request transmission unit 54 transmits an account registration request including a temporary account and an existing account to the mail management server (see S304 in FIG. 3 and S514 in FIG. 5).

  The mail storage unit 55 stores mail received from the mail management server 6 (see S313 in FIG. 3 and S524 in FIG. 5).

  The mail transfer unit 56 causes the terminal to acquire a mail based on the existing account using the temporary account (see S314 in FIG. 3 and S525 in FIG. 5).

  When the account deletion unit 57 receives an account registration request from another mail management server, the account deletion unit 57 deletes the previous temporary account (see S517 in FIG. 5).

  According to the temporary mail management server 6 of FIG. 6, the communication interface unit 60, the account registration unit 61, the account conversion unit 62, the mail transfer unit 63, the server registration request unit 64, the management server identification unit 65, A server mail transfer unit 66 and an account deletion request unit 67 are provided. These functional components are realized by executing a program that causes a computer mounted on the server to function.

  When the account registration unit 61 receives the account registration request, the account registration unit 61 registers the temporary account and the existing account in association with each other (see S305 in FIG. 3 and S515 in FIG. 5).

  The account conversion unit 62 converts the destination address of the mail received from the terminal into a temporary account when the destination address of the mail matches the existing account (see S312 in FIG. 3 and S523 in FIG. 5). In addition, regarding the mail received from the terminal, when the sender address of the mail matches the temporary account, the sender address is converted into an existing account (see S323 in FIG. 3).

  The mail transfer unit 63 transfers the mail whose account has been converted.

  The server registration request unit 64 transmits an account registration request including a temporary account and an existing account to another mail management server (see S516 in FIG. 5).

  Based on the previous temporary account, the management server specifying unit 65 specifies another mail management server that communicates with the temporary mail management server that issued the previous temporary account (see S516 in FIG. 5).

  When the mail address received from the terminal matches the destination address of the mail with the existing account, the server mail transfer unit 66 converts the destination address into a temporary account and transmits it to another mail management server (S522 in FIG. 5). reference).

  When receiving an account registration request from another mail management server, the account deletion request unit 67 transmits an account deletion request to the temporary mail management server (see S517 in FIG. 5).

  As described above in detail, according to the mail transfer system and method of the present invention, it is possible to install a different temporary mail server, and even if the temporary account is set or changed, the user's own Account registration operation becomes easy.

  According to the present invention, the temporary account and the existing account can be automatically linked and converted by the mail management server. At this time, the third party can transmit an email with the existing account as the destination address without being aware of the temporary account of the terminal as the transmission destination. Even if the temporary mail management server is changed due to movement of the terminal, the temporary account is automatically updated between the previous mail management server and the subsequent mail management server, and the terminal Mail to be received is automatically stored by the temporary mail management server after movement. Further, the previous temporary account in the previous mail management server is automatically deleted without requiring a user operation.

  Various changes, modifications, and omissions of the above-described various embodiments of the present invention can be easily made by those skilled in the art. The above description is merely an example, and is not intended to be restrictive. The invention is limited only as defined in the following claims and the equivalents thereto.

1, 1A, 1B terminal 2, 2A, 2B, 2C gateway 3, 3a, 3b Mail server 4 Mail address conversion server 5, 5a, 5c Temporary mail management server 50 Communication interface unit 51 Account acquisition unit 52 Web server unit 53 Account registration Unit 54 registration request transmission unit 55 mail storage unit 56 mail transfer unit 57 account deletion unit 6, 6a, 6c mail management server 60 communication interface unit 61 account registration unit 62 account conversion unit 63 mail transfer unit 64 server registration request unit 65 management server Specific part 66 Server mail transfer part 67 Account deletion request part

Claims (12)

A mail transfer method in a system for transferring mail between terminals,
The system includes a first temporary mail management server (POP (Post Office Protocol ) server) and a first mail management server (SMTP (Simple Mail Transfer Protocol) server) .
A first step in which the first temporary mail management server issues a first temporary count to the first terminal and acquires an existing account from the first terminal;
A second step in which the first temporary mail management server transmits an account registration request including the first temporary account and the existing account to the first mail management server;
A third step in which the first mail management server registers and registers the first temporary account and the account;
When the first mail management server receives a mail received from the second terminal and the destination address of the mail matches the existing account, the first mail management server converts the destination address into the first temporary account, and the first temporary mail management A fourth step of forwarding to the server;
A first temporary mail management server having a fifth step of storing the received mail, wherein the first terminal uses the first temporary account to send the mail based on an existing account to the first A mail transfer method characterized in that the mail transfer method is obtained from a temporary mail management server.   When the first mail management server receives a mail received from the first terminal and the sender address of the mail matches the first temporary account, it converts the sender address into an existing account and forwards the mail. The mail transfer method according to claim 1, wherein: The mail transfer system further includes a second temporary mail management server and a second mail management server,
When the first terminal moves from a position where it can communicate with the first temporary mail management server to a position where it can communicate with the second temporary mail management server,
A sixth step in which the second temporary mail management server issues a second temporary count to the first terminal and obtains the existing account from the first terminal;
A seventh step in which the second temporary mail management server transmits an account registration request including the second temporary account and the existing account to the second mail management server;
An eighth step in which the second mail management server associates and registers the second temporary account and the existing account;
A ninth step in which the second mail management server transmits an account registration request including the second temporary account and the existing account to the first mail management server;
When the first mail management server receives a mail received from the second terminal and the destination address of the mail matches the existing account, the first mail management server converts the destination address into a second temporary account and performs the second mail management. A tenth step of sending to the server;
An eleventh step in which the second mail management server transmits the mail received from the first mail management server to the second temporary mail management server;
A second temporary mail management server for storing the received mail; a first terminal that uses the second temporary account to send the mail based on an existing account to a second The mail transfer method according to claim 1, wherein the mail transfer method is acquired from the temporary mail management server. The sixth step, the second temporary mail management server, the first terminal further acquires the previous first temporary account,
Regarding the seventh step, the second temporary mail management server further includes the first temporary account in the account registration request transmitted to the second mail management server,
For the ninth step, the second mail management server identifies the first mail management server that communicates with the first temporary mail management server that issued the first temporary account based on the first temporary account The mail transfer method according to claim 3, wherein: Between the ninth step and the tenth step,
The first mail management server sending an account deletion request to the first temporary mail management server;
The mail transfer method according to claim 3 or 4, wherein the first temporary mail management server further includes a step of deleting the first temporary account and the existing account.   Regarding the first step and / or the sixth step, the temporary mail management server issues the temporary account by transmitting a Web page to the WWW (World Wide Web) browser of the first terminal. 6. The mail transfer method according to claim 1, wherein the existing account is acquired. An email forwarding system that forwards email between devices,
A temporary mail management server (POP (Post Office Protocol) server) and a mail management server (SMTP (Simple Mail Transfer Protocol) server) ;
The temporary mail management server
An account acquisition means for issuing a first temporary count to the terminal and acquiring an existing account from the terminal;
A registration request transmitting means for transmitting an account registration request including the temporary account and the existing account to the mail management server;
Mail storage means for storing mail received from the mail management server;
An email transfer means for acquiring the email based on an existing account using a temporary account for the terminal;
The mail management server
Account registration means for registering the temporary account and the existing account in association with each other when receiving the account registration request;
Account conversion means for converting a destination address of a mail received from the second terminal into a temporary account when the destination address of the mail matches the existing account;
A mail transfer system comprising mail transfer means for transferring mail whose account has been converted.   The account conversion means of the mail management server converts the source address of the mail received from the first terminal into an existing account when the source address of the mail matches the first temporary account. 8. The mail transfer system according to claim 7, wherein The mail management server
Server registration request means for transmitting an account registration request including the temporary account and the existing account to another mail management server;
Server mail transfer means for converting the destination address of the mail received from the terminal into a temporary account and transmitting it to another mail management server when the destination address of the mail matches the existing account. The mail transfer system according to claim 7 or 8. The account acquisition means of the temporary mail management server further acquires a previous temporary account from the terminal,
The registration request transmission means of the temporary mail management server further includes a previous temporary account in an account registration request transmitted to another mail management server,
The mail management server further includes management server specifying means for specifying another mail management server that communicates with the temporary mail management server that issued the temporary account based on the temporary account. 9. The mail transfer system according to 9. The mail management server further includes an account deletion request transmission means for transmitting an account deletion request to the temporary mail management server when the account registration request is received from another mail management server,
The mail transfer system according to claim 9 or 10, wherein the temporary mail management server further includes account deletion means for deleting the first temporary account and the existing account.   The account acquisition unit of the temporary mail management server issues the temporary account and acquires the existing account by transmitting a Web page to a WWW browser of the terminal. The mail transfer system according to any one of 11.

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