JP3562648B2 - E-mail transmission system by proxy e-mail address - Google Patents

Description

【Technical field】
[0001]
The present invention extracts a corresponding proxy email address from a user's primary email address and a recipient's email address, converts the user's primary email address into a proxy email address, and sends the email address to the recipient's email address. The present invention relates to an e-mail transmission system using a substitute e-mail address for transmission to an e-mail.
[Background Art]
[0002]
Conventionally, when there is a concern about leakage of an individual's primary email address, obtain a second email address with a free email address, etc., send using the second email address, and use the mail transfer function to transfer to the individual's primary email address If the received contents are transferred, the second mail address is leaked, and if an unpleasant and unpleasant direct mail comes to be sent, there is a method of manually discarding the mail address.
Managing email addresses is important. It is a reality that e-mail addresses and personal information are leaked by applying for Internet shopping or sweepstakes. If a mail address is leaked between traders, "direct mail" is frequently sent, and the receiving fee cannot be ridiculous. A virus may be sent.
As a technique for solving such a problem, for example, in Japanese Patent Application Laid-Open No. 2001-127788, "Network Mail System Electronic Mail System", there is a technique for removing a danger of inadvertently communicating with an inappropriate partner. The technical content is disclosed.
According to the present invention, a special server for translating an address is placed in a network, managed by a neutral organization, and a real address is translated into a temporary address to mediate mail, thereby allowing unknown mail to be transmitted. The communicators communicate by e-mail without leaking the real name or address of the other party. It also has a means to protect the database for address translation from unauthorized attacks, and a means to prevent the correspondence of names and addresses from being leaked by examining the correspondence of mail coming into and out of the server from the outside. Have. In addition, based on the consent of the communicators, a service for disclosing information on the other party is provided.
[0003]
However, even when such a technique is used, only the effect of converting a real address to a temporary address is provided, which only has the effect of hiding the user's real mail address. In the present invention, the user is authenticated by using a password or the like, and the operation and management are complicated.
Alternatively, in Japanese Patent Application Laid-Open No. 11-34145, "E-mail transfer device, e-mail transfer method, and recording medium on which e-mail transfer control program is recorded", unnecessary publicity is disclosed by disclosing the actual address of the e-mail when applying for a prize. And technical contents for preventing disadvantages of sending direct mail.
According to the present invention, only a virtual address independent of a real address is disclosed as an e-mail address, and when an e-mail is received, a real address of a transfer destination corresponding to the virtual address is searched from a user database. Then, the electronic mail is transferred to the transfer destination, and when the cumulative number of the transferred mails exceeds the upper limit of the number of transfer times, the invalidation processing is reserved. Further, the user database is searched, and the invalidation processing of the address whose expiration date is older than the current date and time is reserved. The reserved invalidation process is performed immediately after the transfer of the electronic mail to the real address is completed. If the user desires automatic continuation, a new virtual address is automatically created, an e-mail addressed to the new virtual address is set to be forwarded to the real address of the user, and the user is notified.
[0004]
However, also in this case, since only the real address is converted to the temporary address, only the effect of hiding the user's real mail address is produced. Further, in the present invention, since the invalidation processing of the address is indispensable, it is not possible to keep using the mail address without disposable.
Furthermore, in the above-mentioned conventional technology, in response to a temporary mail address being disclosed to an unintended third party, for example, unnecessary mail such as an unnecessary advertisement or spam mail arrives. No effective countermeasures have been taken in the event that this happens.
DISCLOSURE OF THE INVENTION
[Means for Solving the Problems]
[0005]
Therefore, in order to solve the above various problems, in the system of the present invention, a mail address correspondence table in which the user's main mail address, the mail address of the transmission destination partner, and the substitute mail address are associated one-to-one. Is adopted.
When using this "disposable e-mail" system, the server automatically issues a "substitute e-mail address" instead of the principal's main e-mail address, and transmits using the "substitute e-mail address". The reply mail is received by the "proxy mail address" and forwarded to the main mail address of the person.
If the "agent mail address" is leaked between the traders, it can be discarded. The main purpose of a general mail transfer service is to unify multiple e-mail addresses, but "disposable e-mail" aims to conceal personal e-mail addresses and to investigate and take measures against leakage.
[0006]
In order to solve the above problem, in the invention according to claim 1,
Performs email transmission / reception processing between the sender user's primary email address and destination email addressServer systemIn an email system with
The server system comprises:
senderUser's primary email addressWhenThe destination email address andMemorize proxy mail addresses that correspond one-to-one to combinations ofEmail address correspondence table,
A mailbox for each of the proxy email addresses;
Sent from the primary email address of the sending user to the destination email addressThe primary email address of the emailCorresponding to the combinationA program that converts it to a proxy email address and sends itHas,
Outgoing email sent from the primary email address of the sending user to the destination email addressPrimary email address,Based on the combination of the mail address correspondence table,Convert to a proxy email addressAfter sending the e-mailSend to destination email addressAnd,
If there is a received e-mail from a partner different from the combination defined in the e-mail address correspondence table, the sender user who has received the received e-mail, An e-mail system in which a process to be executed on at least one of an e-mail, the e-mail address correspondence table, and the mailbox of the proxy e-mail address can be selected.It is characterized by being.
[0007]
In order to solve the above-mentioned problem, in the invention according to claim 2,
Performs email transmission / reception processing between the sender user's primary email address and destination email addressServer systemIn an email system with
The server system comprises:
The sourceUser's primary email addressWhenThe destination email address andMemorize proxy mail addresses that correspond one-to-one to combinations ofEmail address correspondence table,
A mailbox for each of the proxy email addresses;
A substitute e-mail address corresponding to a combination of the main e-mail address of the sender user and the destination e-mail address is issued one-to-one and stored in the e-mail address correspondence table. Sent to your email address ToThe primary email address of the emailCorresponding to the combinationA program that converts it to a proxy email address and sends itHas,
The proxy e-mail address issued and stored in the e-mail address correspondence table includes a prefix part and a suffix part, the prefix part is obtained from the server system, and the prefix part is a user-definable electronic mail. systemIt is characterized by being.
[0008]
In order to solve the above-mentioned problem, in the invention according to claim 3,
Performs email transmission / reception processing between the sender user's primary email address and destination email addressServer systemIn an email system with
The server system comprises:
The sourceUser's primary email addressWhenThe destination email address andMemorize proxy mail addresses that correspond one-to-one to combinations ofEmail address correspondence table,
A mailbox for each of the proxy email addresses;
A substitute e-mail address corresponding to a combination of the main e-mail address of the sender user and the destination e-mail address is issued one-to-one and stored in the e-mail address correspondence table. Sent to email addressThe primary email address of the emailCorresponding to the combinationA program that converts it to a proxy email address and sends itHas,
An e-mail system, wherein the proxy e-mail address issued and stored in the e-mail address correspondence table is provided with a redundant portion for an error detection function;It is characterized by being.
[0009]
Further, in order to solve the above-mentioned problem, in the invention according to claim 4,
The server system issues a proxy e-mail address corresponding to a combination of a main e-mail address and a destination e-mail address of the source user one-to-one in response to the proxy e-mail address issuance request data received from the source user. The e-mail system according to claim 1, wherein the e-mail system stores the e-mail address in the e-mail address correspondence table.It is characterized by being.
[0010]
In order to solve the above-mentioned problem, in the invention according to claim 5,
If the destination e-mail address of the e-mail received from the source user is not stored in the e-mail address correspondence table,
4. The mail address correspondence table according to claim 1, wherein a proxy mail address corresponding one-to-one to the combination of the main mail address of the transmission source user and the transmission destination mail address is issued and stored in the mail address correspondence table. Email systemIt is characterized by being.
[0010]
In order to solve the above-mentioned problem, in the invention according to claim 6,
The electronic mail system according to claim 1, wherein a plurality of destination mail addresses are stored in correspondence with one proxy mail address stored in the mail address correspondence table.It is characterized by being.
[0011]
In order to solve the above-mentioned problem, in the invention according to claim 7,
If there is a received e-mail from the destination e-mail address corresponding to the combination stored in the e-mail address correspondence table to the substitute e-mail address, the substitute e-mail address is converted to a corresponding main e-mail address and 7. An electronic mail system according to claim 1, wherein the electronic mail is transferred to a mail address.It is characterized by being.
BEST MODE FOR CARRYING OUT THE INVENTION
[0014]
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
An electronic mail transmission system using a proxy mail address according to the present invention performs information processing by a user operation on a user terminal such as a computer or a portable information terminal provided with input means, control means, display means, output means, storage means and the like. And a server system accessed from a user terminal.
[0013]
The server system is provided with a mail server, and a mailbox is provided for each proxy mail address.
Further, the server system stores an e-mail address correspondence table in which the user's main e-mail address, the e-mail address of the transmission destination partner, and the substitute e-mail address are associated one-to-one.
Also, the server system has a program for generating a proxy mail address and issuing it to the user, converting the user's primary mail address of the e-mail sent from the user terminal into a proxy mail address, and sending it to the destination. Be provided.
From the user's primary email address and the recipient's email address included in the email sent from the user terminal, extract the corresponding proxy email address, convert the user's primary email address to a proxy email address, The transmission is performed to the mail address of the transmission destination.
[0015]
FIG. 1 is a system conceptual diagram showing a basic configuration of an electronic mail transmission system using a substitute mail address.
FIG. 2 is a diagram showing an example of a mail address correspondence table.
The transmission and reception of the e-mail is performed via the “proxy mail address”.
It is desirable that the creation of the substitute e-mail address be performed automatically as described later. The substitute e-mail address is stored in the e-mail address correspondence table in association with the e-mail address of the transmission destination. Once a proxy mail address is generated and stored in the mail address correspondence table, the second and subsequent transmissions can select a previously used proxy mail address from this related information and perform transmission and reception.
If it is a new destination, create another new proxy e-mail address and send / receive it. The destination and the proxy mail address have a one-to-one relationship. Destinations can be managed as a group.
When a direct mail is sent to a trader who knows the substitute mail address, the source mail address is different from “association” and can be determined to have been leaked. Various countermeasures and countermeasures can be taken, such as discarding the mail, notifying the leakage status, temporarily stopping and discarding the proxy mail address, and thereby making it possible to use the mail as a disposable mail address. In the following, in the present specification and the drawings, the “e-mail transmission system using a substitute mail address” is referred to as a “disposable mail system” and the “substitute mail address” is referred to as a “disposable mail address” as necessary, but the meaning is the same. .
[0016]
FIG. 3 is a diagram showing a server system of a “disposable mail” system and a client terminal of a user.
In a "disposable mail" system, a user can send and receive mail using general POP3 mail software such as Outlook Express (trademark) of Microsoft (trademark).
Services such as issuing a proxy mail address can be used by relaying the client software of the "disposable mail" system. The user needs to install and set up the client software, but the subsequent transmission and reception of mail is exactly the same as sending mail directly to the other party without using the server system of the present invention. In other words, there is no hassle. The "disposable mail" client function can also be incorporated into mail software.
[0017]
Hereinafter, an example of the flow of the process of the present invention will be described by taking as an example a case where the user suzuki@ocn.net sends an e-mail to yamada@ocn.net using the "disposable e-mail" system.
First, as shown in FIG. 4, when sending an e-mail to the other party's e-mail address, the user terminal specifies the other party's e-mail address and transmits proxy mail address issuance request data to the server system. Then, the server system performs the receiving process.
When an e-mail is sent in an environment where a "disposable e-mail" system is installed, the e-mail is transferred to a "disposable e-mail" server through client software. The server checks the destination, and if it is a new partner, automatically issues a new proxy mail address and registers it in the mail address correspondence table. In the server system, based on the received proxy e-mail address issuance request data, a proxy e-mail address corresponding to the main e-mail address of the user and the e-mail address of the transmission destination is issued on a one-to-one basis. Processing for storing the information in the correspondence table is performed. Proxy email addresses are automatically issued and managed.
[0018]
FIG. 5 shows an example of data of a mail address correspondence table.
Perform the process of setting the mailbox for each proxy email address corresponding to the proxy email address, and then, from the user's primary email address and the email address of the other party included in the email sent from the user terminal, The proxy mail address to be extracted is extracted, the user's primary email address is converted to a proxy email address, and the proxy email address is determined from the user's primary email address and the other party's email address.
A substitute e-mail address is associated one-to-one with the user's primary e-mail address and the e-mail address of the transmission destination, and stored in the e-mail address correspondence table. If you want to send a different proxy e-mail address.
[0019]
However, one proxy e-mail address can be used for multiple parties.
In this case, as described in claim 6, by managing the transmission destinations as a group in the mail address correspondence table in which the transmission destinations and the substitute mail addresses are associated one-to-one, one A proxy email address can be used for multiple parties.
The issued proxy e-mail address is stored and managed in the e-mail address correspondence table in which the destination and the substitute e-mail address are associated one-to-one. It is desirable to be able to delete from the table.
Users need to set up email response settings for leaks when using the "disposable e-mail" system, but there is no special work compared to normal e-mail transmission and reception. When a leak is detected, the user checks the report of the leak detection, and then requests the server to process and discard the leaked proxy mail address from the user.
[0020]
FIG. 6 is a conceptual diagram showing a process of transmitting a mail using a substitute mail address and receiving a reply. Once a proxy mail address is generated and stored in the mail address correspondence table, the second and subsequent transmissions can select a previously used proxy mail address from this related information and perform transmission and reception.
Next, as shown in FIG. 4, in the mail sent from the user to the destination, the source of the mail transferred from the client software is replaced with a proxy mail address in the server system, and the mail is sent to the destination (the destination). Send The reply destination seen from the other party becomes the proxy mail address, and the original sender is completely hidden. In FIG. 6, “abcd@dispo-address.net” is the proxy mail address in this case.
[0021]
Next, a description will be given of a process of transmitting an e-mail from the user terminal and returning a reply to the substitute e-mail address from the received terminal.
As described in Claim 7, the reply mail transmitted from the transmission destination is received by the mailbox of the proxy mail address in the server system, and is then transferred to the user's main mail address.
FIG. 7 is a conceptual diagram showing a process in which a mailbox of a substitute mail address is received and then transferred to a user's main mail address. The mail received by the substitute mail address abcd@dispo-address.net is sent to the user suzuki@ocn.net.
[0022]
Next, a case where an e-mail arrives from an address other than the partner's e-mail address corresponding to the substitute e-mail address will be described. That is, as shown in FIG. 8, a case where a mail arrives at a substitute mail address from a destination that is not intended by the user, such as when the mail address is leaked to a direct mail trader or the like.
When an e-mail arrives from an address other than the partner e-mail address corresponding to the substitute e-mail address, refer to the e-mail address correspondence table, and from the e-mail address dm@meiwaku.com and the substitute e-mail address abcd@dispo-address.net of the direct mail company, Since it is not the original partner, it can be determined that the mail address is leaked.
The server system unconditionally forwards the mail arriving at the proxy mail address to the individual's main mail address. No distinction is made between emails that you want to receive and emails that you do not.
[0023]
Look at the email that has been forwarded to your primary email address and decide what to do next. Specifically, (1) temporary stop of the substitute e-mail address, (2) discard, (3) change only the other party's e-mail address without changing the substitute e-mail address in the e-mail address correspondence table. Or (4) Multiple registration. In addition, since the main purpose is to unify e-mail addresses, all e-mails are received at an individual's main e-mail address. Of course, if the transfer function is not used, the mail address becomes an independent mail address, so that the mail address can be used as an individual mail address without being transferred to the main mail address.
In the case where the mail is received outside the specified range, such as when a direct mail is sent to a substitute mail address, the source mail address is different from the “association” stored in the above mail address correspondence table and is leaked. By performing a process of determining that the e-mail has been discarded, the user can select a response such as discarding the e-mail, notifying the leakage status, and temporarily stopping or discarding the substitute e-mail address.
[0024]
To handle emails from people other than the one corresponding to the proxy email address,
-Temporarily prohibit the use of the "substitute email address".
-Discard the "substitute email address".
-Change the "other party's mail address" in the mail address correspondence table.
-Add to "e-mail address of partner" in the e-mail address correspondence table. That is, a plurality is registered.
And so on.
[0025]
Next, as an embodiment of the present invention, a mode in which exchange of mail using a substitute mail address is started by transmission from a destination will be described.
It is possible for the user to obtain a proxy e-mail address from the server system in advance and secure it.If the user notifies the proxy e-mail address as a contact at the time of purchase of a product at a store, the proxy e-mail is sent to the server system. When an e-mail is received at the address, a process of automatically registering the substitute e-mail address in the e-mail address correspondence table as a transmittable / receivable address can be performed so that the substitute e-mail address can be used.
FIG. 9 is a conceptual diagram showing a process in which a user previously acquires a substitute mail address from a “disposable” mail server.
The user sends a request for obtaining a substitute e-mail address from the user terminal to the server system, and obtains the substitute e-mail address from the "disposable" mail server in advance. At this stage, it has not been registered in the mail address correspondence table yet, but has just been secured.
Enter your e-mail address as contact information when purchasing products at the store. When an e-mail is sent from the other party to the substitute e-mail address, the server automatically registers and activates the substitute e-mail address in the mail correspondence table in the server system as a transmittable / receivable address. FIG. 10 is a conceptual diagram showing this processing.
[0026]
As an embodiment of the present invention, another embodiment in which an inactive substitute e-mail address for which reservation is secured is prepared in advance will be described.
It is possible for the user to obtain a proxy mail address from the server system in advance and secure it. When the user accesses the server system by accessing from a browser, e-mail for obtaining a proxy mail address, etc. By returning the name to the user terminal, the proxy mail address reserved and reserved in advance can be used.
Obtained from the "disposable mail" server system through browser access.
By sending the e-mail for obtaining the substitute mail address to the "disposable mail" server system, the substitute mail address name is returned from the server system to the user terminal. This allows addition and acquisition from any communication means such as a mobile phone.
[0027]
Alternatively, the user may send an e-mail using an inactive substitute e-mail address reserved by the user. Registration and activation in the mail address correspondence table are performed in the same manner.
That is, an electronic mail addressed to the substitute mail address is transmitted from the user terminal and received by the server system, so that the substitute mail address reserved and reserved in advance can be used.
[0028]
Next, in the server system, based on the received proxy mail address issuance request data, in the process of issuing a proxy mail address that is associated one-to-one with the user's main mail address and the mail address of the transmission destination partner. Various embodiments will be additionally described.
The proxy mail address name obtained from the server is divided into a prefix and a suffix, and the prefix part is obtained from the server so that the user can freely define the suffix part.
FIG. 11 shows an example of a proxy mail address issued in the present embodiment, and FIG. 12 shows an example of a mail address correspondence table.
For example, the proxy e-mail address for the user A always starts with “DAIRI” (prefix), such as “DAIRI **** @ domain”, and is an e-mail address with additional characters (suffix). If user A wants to add a substitute email address, put the date, the name of the other party, etc. in the suffix part, and make it “DAIRI0921 @ domain”. It makes it very easy for users to manage proxy email addresses.
When a "disposable mail" server receives a mail, it can identify the user from the prefix part of the mail address, and can forward the mail to the user.
The proxy email address has a prefix determined for each user. If you need a new proxy email address, you can use the "single use email" system by specifying an email address with a suffix added. Email addresses with the same prefix are managed for the same user.
[0029]
Next, the method includes a process of adding a redundant portion to a proxy address automatically generated by the server system and adding an error detection function.
This is a defense method in the case of sending unilaterally to a group of e-mail addresses generated by a certain algorithm.
Add a redundant part to the proxy address automatically generated by the "disposable mail" server and add an error detection function.
Since all the bytes of the proxy address are dispersed and include a redundant portion, it is impossible to separate only the redundant portion. If a malicious person attacks with an email address generated by some kind of algorithm, most will be eliminated by the error detection function. The rate that cannot be eliminated is determined by the number of bytes of the proxy address and the number of added redundant bytes.
The protection method will be described with an example of an exclusion rate of 99%. 99% of emails sent by malicious people can be discarded immediately.
If it is determined that the e-mail address is incorrect, incoming mail is restricted for the source of the e-mail. In other words, mail sent by the same sender is not received for a certain period of time, regardless of the authenticity of the mail address or whether it is illegal. Or do not transfer. This makes it possible to generate e-mail addresses using a certain algorithm and prevent attacks that send large amounts of e-mail.
[0030]
The present invention is applicable not only to the current method of treating a mail address as a character string of a maximum of several tens of bytes in any of the embodiments described above, but also to a method in which a substitute mail address is stored and managed as a data file. It also supports the method of handling addresses as files. There is no limit on the size of the file.
[Industrial applicability]
[0031]
As described in detail above, according to the present invention, a corresponding proxy e-mail address is extracted from a user's main e-mail address and a destination e-mail address included in an e-mail transmitted from a user terminal. It is possible to provide an electronic mail transmission system using a substitute mail address, which converts a user's main mail address into a substitute mail address and transmits the converted mail to a destination mail address.
Thus, when using a "disposable e-mail" system, the server automatically issues a "substitute e-mail address" instead of the principal's main e-mail address, and transmits using the "substitute e-mail address". The reply mail is received by the "proxy mail address" and can be transferred to the main mail address of the person.
Also, when the "proxy mail address" is leaked between the traders, it can be discarded, and the concealment of the personal mail address and the leak investigation / measures can be performed.
[Brief description of the drawings]
[0032]
FIG. 1 is a system conceptual diagram showing a basic configuration of an electronic mail transmission system using a substitute mail address. In FIG. 1, reference numeral 1 denotes a transmission request by a proxy mail address, 2 denotes a transmission by a proxy mail address abcd@dispo-address.net, 3 denotes a leak of the proxy mail address, 4 denotes a solicitation mail, and 5 denotes two types in the header part. The processing of adding and transferring the information is shown.
FIG. 2 is a diagram showing an example of a mail address correspondence table.
FIG. 3 is a diagram showing a server system and a client terminal of a user.
FIG. 4 is a process of transmitting a substitute mail address issuance request data to the server system by designating the mail address of the other party from the user terminal when sending an e-mail to the mail address of the other party, and receiving the data at the server system. FIG.
FIG. 5 shows an example of data of a mail address correspondence table.
FIG. 6 is a conceptual diagram showing a process of transmitting a mail using a proxy mail address and receiving a reply.
FIG. 7 is a conceptual diagram showing a process in which a mailbox of a substitute mail address is received and then transferred to a user's main mail address.
FIG. 8 is a diagram illustrating a case in which a mail arrives at a substitute mail address from a destination unintended by the user, such as when a mail address is leaked to a direct mail trader or the like.
FIG. 9 is a conceptual diagram illustrating a process in which a user acquires a proxy mail address from a “disposable” mail server in advance.
FIG. 10 is a conceptual diagram showing a process of, when a mail is sent from a partner to a substitute mail address, automatically registering the substitute mail address in the mail correspondence table in the server system as an address that can be transmitted and received.
FIG. 11 shows an example of a proxy mail address issued in the embodiment of the present invention. 4 shows an example of a mail address correspondence table.
FIG. 12 shows an example of a mail address correspondence table in the embodiment of the present invention.

Claims (7)

In an e-mail system including a server system that performs e-mail transmission / reception processing between a main e-mail address of a transmission source user and a destination e-mail address ,
The server system comprises:
And e-mail address corresponding table for storing the proxy e-mail address corresponding to the one-to-one to the combination of the destination mail address and the main e-mail address of the sender user,
A mailbox for each of the proxy email addresses;
The main e-mail address of the e-mail sent to the destination mail address from the main e-mail address of the sender user, and a program to be transmitted into a proxy mail address corresponding to said combination,
After converting the main e-mail address of the outgoing e-mail transmitted from the main e-mail address of the source user to the destination e- mail address to a corresponding substitute e-mail address based on the combination of the e-mail address correspondence tables , and sends it to the destination mail address,
If there is a received e-mail from a partner different from the combination defined in the e-mail address correspondence table, the sender user who has received the received e-mail, An e-mail system in which a process to be executed on at least one of an e-mail, the e-mail address correspondence table, and the mailbox of the proxy e-mail address can be selected . In an e-mail system including a server system that performs e-mail transmission / reception processing between a main e-mail address of a transmission source user and a destination e-mail address ,
The server system comprises:
And mail address correspondence table for storing a proxy mail address corresponding one-to-one to the combination of the destination mail address and the main e-mail address of the sender user,
A mailbox for each of the proxy email addresses;
A substitute e-mail address corresponding to a combination of the main e-mail address of the sender user and the destination e-mail address is issued one-to-one and stored in the e-mail address correspondence table. the main e-mail address of the e-mail sent to the mail address, and a program to be transmitted into a proxy mail address corresponding to said combination,
The proxy e-mail address issued and stored in the e-mail address correspondence table includes a prefix part and a suffix part, the prefix part is obtained from the server system, and the prefix part is a user-definable electronic mail. System . In an e-mail system including a server system that performs e-mail transmission / reception processing between a main e-mail address of a transmission source user and a destination e-mail address ,
The server system comprises:
And mail address correspondence table for storing a proxy mail address corresponding one-to-one to the combination of the destination mail address and the main e-mail address of the sender user,
A mailbox for each of the proxy email addresses;
A substitute e-mail address corresponding to a combination of the main e-mail address of the sender user and the destination e-mail address is issued one-to-one and stored in the e-mail address correspondence table. the main e-mail address of the e-mail sent to the mail address, and a program to be transmitted into a proxy mail address corresponding to said combination,
An electronic mail system, wherein a redundant part for an error detection function is added to the proxy mail address issued and stored in the mail address correspondence table . The server system issues a proxy e-mail address corresponding to a combination of the main e-mail address and the destination e-mail address of the source user one-to-one in response to the proxy e-mail address issuance request data received from the source user. The e-mail system according to claim 1 , wherein the e-mail system stores the e-mail address in the e-mail address correspondence table . If the destination e-mail address of the e-mail received from the source user is not stored in the e-mail address correspondence table, a pair of the main e-mail address of the source user and the destination e-mail address is paired. 4. The electronic mail system according to claim 1, wherein a corresponding substitute mail address is issued and stored in said mail address correspondence table . 6. The electronic mail system according to claim 1, wherein a plurality of destination mail addresses are stored in correspondence with one proxy mail address stored in said mail address correspondence table . If there is a received e-mail from the destination e-mail address corresponding to the combination stored in the e-mail address correspondence table to the substitute e-mail address, the substitute e-mail address is converted to the corresponding main e-mail address and The electronic mail system according to claim 1, wherein the electronic mail is transferred to a mail address .

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