JP2003141033A - E-mail system for preventing mis-delivery - Google Patents

Abstract

(57) [Summary] [Problem] To prevent erroneous transmission of electronic mail. A mailer program includes a process of adding a keyword specified as a confirmation keyword preset by a destination user of an electronic mail to an address specified as a destination of the electronic mail, and an address to which the keyword is added. A process of transmitting the e-mail data including the to the e-mail transmission server 11 is performed. Email sending server 11
Transmits the mail data to the mail receiving server 5 corresponding to the domain name of the destination address. Mail receiving server 5
Is a process of extracting a keyword specified as a confirmation keyword preset by the destination user to the destination address of the received mail,
A process for determining whether the keyword is a confirmation keyword set in advance by the destination user, and a process for storing mail data in the storage area 51 for the destination address if the keyword is a confirmation keyword.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for sending and receiving electronic mail, and more particularly to a technique for preventing mistaken sending of electronic mail.

[0002]

2. Description of the Related Art Conventionally, when an e-mail is sent by designating an incorrect mail address, if the mail address itself does not exist, an error notification is sent to the sending user. Has become. On the other hand, if there is a wrong mail address by chance, the electronic mail will be sent to the wrong mail address. In this case, since the same process as the normal process is performed, no error notification is given. Therefore, from the viewpoint of the user on the transmitting side, it is apparently transmitted as though it was transmitted correctly although it was not transmitted to the intended destination.

As a countermeasure against erroneous sending, there is a method of encrypting and transmitting the contents of an electronic mail, but it is not a fundamental measure because it cannot be decrypted at the erroneous destination. Also, the sending user cannot recognize the erroneous sending as described above.

There is also a function for adding a designation for prompting the transmission of a reception confirmation message when the destination user receives it at the time of transmission, but erroneous transmission cannot be prevented and the reception side user notices that the reception confirmation message arrives. It is possible, but not certain.

[0005]

As described above, in the conventional technology, it was not possible to sufficiently prevent the erroneous sending of electronic mail.

Therefore, it is an object of the present invention to provide a new technique for preventing erroneous sending of electronic mail.

[0007] Another object of the present invention is to provide a technique for enabling a user on the sending side of an electronic mail to recognize it even if it is mistakenly sent.

Still another object of the present invention is to provide a novel technique capable of preventing erroneous sending of electronic mail while maintaining the conventional electronic mail transmission / reception system.

[0009]

According to an electronic mail transmission processing method of the present invention, a keyword designated as a confirmation keyword preset by a destination user of an electronic mail at an address designated as a destination of the electronic mail. Is added and stored in the storage device, and the step of transmitting the electronic mail data including the address to which the keyword is added to the electronic mail transmission server.

By doing so, the e-mail receiving server will check not only the e-mail address match / mismatch but also the keyword. Therefore, the sender user should specify the wrong e-mail address. In addition, even if the wrong e-mail address exists by chance, it becomes possible to determine the wrong sending by the keyword.

Further, the keyword adding step described above is performed on the user name part of the address designated as the destination of the electronic mail (eg, xxx part in the case of the mail address xxx@yyy.ne.jp). A keyword specified as a confirmation keyword preset by the destination user of the e-mail is added together with at least a delimiter code (for example, a prohibition code whose meaning is not defined) from the user name portion of the address, and a storage device It is also possible to use the step of storing in.

In this way, the keyword can be easily extracted in the electronic mail receiving server. If, for example, a delimiter is a prohibited character whose meaning is not defined, an error will occur in the destination address even if the email receiving server of the wrong destination does not adopt the method of the present invention. Error notification can be sent back at that point.

The configuration may further include a step of reading out a keyword registered in advance in the storage device corresponding to the address. That is, for example, the keyword is registered in advance in the address book and the keyword is read out.

On the other hand, in the electronic mail reception processing method according to the present invention, when a keyword designated as a confirmation keyword preset by the destination user is added to the destination address of the received email, the keyword is associated with the keyword. And a keyword extraction step of storing the extracted keyword in a storage device, and a determination step of determining whether the extracted keyword is a confirmation keyword preset by the destination user,
And storing the mail data in the storage area for the destination address when the keyword is the confirmation keyword.

By doing so, for example, even if the destination addresses happen to coincide with each other, it is judged whether the keyword further coincides with the confirmation keyword, so that erroneous transmission can be prevented. In addition, if it is not determined that the keyword is added, if the conventional processing is performed,
No special problems can occur.

Further, when the above keyword is a confirmation keyword, it is possible to further include a step of transmitting a reception confirmation message designated by the destination user to the transmission source. By doing so, even if the destination address and the keyword of the erroneous destination are accidentally matched, the unique reception confirmation message specified by the destination user is sent, so the sending user does not intend to receive the message. You can notice the mistake in the confirmation message.

The above method can be implemented by a program, and the program is stored in a storage medium or a storage device such as a flexible disk, a CD-ROM, a magneto-optical disk, a semiconductor memory, a hard disk. It may also be distributed via a network or the like. The intermediate processing result is temporarily stored in the memory.

[0018]

DETAILED DESCRIPTION OF THE INVENTION

FIG. 1 is a schematic diagram of a system according to an embodiment of the present invention. For example, the user terminal 3 which is a personal computer and in which the mailer program 31 is installed is connected to the Internet service provider (Internet Service P) via the public line network 7.
rovider: ISP) to connect to the connection server 9. Although only one user terminal 3 is shown here, many user terminals 3 connect to the connection server 9 via the public line network 7. The connection server 9 is a server that manages the connection of the user terminal 3 to the Internet 1, and
It is connected to the mail transmission server 11 provided in the SP. The mail transmission server 11 uses an SMTP (Simple Mail).
It is a server that sends mail data according to the Transfer Protocol), and since it is no different from conventional servers, it will not be described further. The connection server 9 and the mail transmission server 11 are connected to the Internet 1. The connection server 9
In some cases, only one mail transmission server 11 performs all the functions, and in some cases, each server is prepared and configured to realize a predetermined function.

A mail receiving server 5 and a mail receiving server B (13) are connected to the Internet 1.
Although only one is shown here, the number is arbitrary. This mail receiving server 5 and mail receiving server B
(13) is also SMTP and POP (Post Office Protocol)
Although the mail data is transmitted and received according to, the case where it is received will be described here. In addition, the mail receiving server B (1
3) is a mail receiving server that is not compatible with this embodiment. The mail receiving server 5 is a keyword DB that stores a mail box 51 for the user managed by the server and a confirmation keyword preset by the user.
53 are managed. On the other hand, the conventional mail receiving server B (13) manages the mail box 131 for the user managed by the server.

In the conventional method, the transmitting user uses the user terminal 3
When sending an e-mail by operating, specify the destination address in the mailer program 31, enter the text of the e-mail, and instruct the sending. Then, the mailer program 31 transmits the mail data to the mail transmission server 11. Upon receiving the mail data from the mailer program 31, the mail transmission server 11 identifies the mail reception server 5 from the domain name of the destination address and transmits the mail data to the mail reception server 5. if,
If the domain name is wrong and the mail receiving server 5 corresponding to the specified domain name does not exist,
The mail sending server 11 sends an error notification to the sender. When the mail receiving server 5 receives the mail data, the mail receiving server 5 checks the user name of the destination address to determine whether the mail is addressed to the user managed by the mail receiving server 5, that is, the storage area for the destination address. -Determine if the box exists. If there is no area for the destination address in the mail box 51, an error notification is sent to the sending user. On the other hand, if the mail box 51 has an area for the destination address, the mail data is stored in the area of the mail box 51 for the destination address.

Next, a case will be described in which the sending user operates the user terminal 3 to send an electronic mail by the method according to the present embodiment. As a premise, if the mail receiving server 5 used by itself adopts the method according to the present embodiment, a confirmation keyword is determined and an e-mail
Publish the confirmation keyword paired with the address. That is, the person who is likely to send an e-mail to himself is informed of the e-mail address and the confirmation keyword. Further, it also determines the unique message that the mail receiving server 5 sends to the sender when the electronic mail is normally received according to the method according to the present embodiment. For example, for a unique message, you should be able to identify yourself by your name and affiliation. Then, the confirmation keyword and the unique message are registered in the keyword DB 53 managed by the mail receiving server 5 in association with the electronic mail address or the user name of the electronic mail address.

Under such a premise, the contents of the processing will be described with reference to FIGS. First, the processing when a new function is added to the mailer program 31 will be described.
When sending the e-mail, the sending user activates the mailer program 31. Then, the destination address, the mail text, etc. are input to the mailer program 31.
If the keyword is not registered in the address book included in the mailer program 31, the keyword input button provided in the window of the mailer program 31 is clicked before clicking the send button. The mailer program 31 displays the keyword input window in response to the pressing of the keyword input button (FIG. 2: step S1). The user inputs the keyword specified by the destination user in the keyword input field provided in this keyword input window. The mailer program 31 receives a keyword input by the user and saves the keyword in the storage device (step S3).

If a keyword is not registered in the address book and the send button is clicked before the keyword input button is clicked, the electronic mail is sent by the conventional method.

Next, the processing when the sending user clicks the send button will be described with reference to FIGS. When the sending user clicks the send button, the mailer program 31 accepts the press of the send button (step S5), and determines whether the keyword has been input (step S7). If the keyword has already been input as shown in FIG. 2, the input keyword is read from the storage device (step S9) and the process proceeds to step S15. On the other hand, if the keyword has not been input, it is determined whether the keyword has been registered in the address book (step S11). If the keyword is not registered in the address book, the process proceeds to step S17. In this case, the conventional mail transmission process is executed.
If the keyword is already registered in the address book, the keyword is read from the address book (step S1).
3).

FIG. 4 shows an example of data stored in the address book in this embodiment. In this example, the display name (the name displayed before the e-mail address in the address field (for example, taro <taro@xyz.ne.jp>)), name, e-mail address, and keyword , Nickname, telephone number, fax number, etc.

After step S9 or step S
Subsequent to step 13, a keyword is added to the user name part of the destination mail address and stored in the storage device (step S15). This process will be described with reference to FIG. For example, assume that the original destination address is taro@xyz.ne.jp and the keyword of this destination address is bluesky. As shown in FIG. 5, the mail data is composed of a mail header and a mail body, and the destination of the mail header includes taro@xyz.ne.jp before step S15. . The destination may be To: or Cc: and Bcc :, but these are not distinguished in this embodiment. In step S15, a non-character delimiter code (control code) is added to both sides of the keyword bluesky and added to the user name portion of the destination address. Normally, the destination address of the mail header is composed of characters in the ASCII code range from 0x21 to 0x7E (however, some characters such as; and: cannot be used), so the delimiter code uses a code outside this range. For example, 0xf1 (left side: represented by ■) and 0xf2 (right side: □)
Represents). If a non-character delimiter code is added in this way, and if it is erroneously sent to the mail receiving server B (13) that does not employ the method of this embodiment, it is immediately possible to determine that the mail address is not appropriate. It is possible to send an error message back to the sender. Therefore, when the process of step S15 is performed, the destination address is
It is transformed into bluesky□@xyz.ne.jp. In addition, what is shown below each character in FIG. 5 is a code number.

FIG. 5 is an example, and only the left delimiter code may be used. This is because the right side is separated by @. Also, the keyword may be converted using some key. Also, without adding a delimiter code,
The configuration may be such that a keyword is converted into a code in a predetermined range that can be identified. It should be noted that the delimiter code may be a prohibition code for the mail address, which has no other meaning. In addition, the keyword may be inserted / added in a manner that can be identified from the destination address.

Although it is possible to add a keyword to the domain name, the processing of the mail transmission server 5 must be changed. That is, when the mail transmission server 5 receives the mail data, it must identify the domain name with the keyword removed and connect to the mail reception server corresponding to the domain name.

Returning to the explanation of FIG. 3, after step S15, the mailer program 31 transmits the data of the mail to the mail transmission server 11 (step S17). After that, the mail transmission server 11 specifies the mail reception server 5 from the domain name of the destination address, connects to the mail reception server 5, and transmits the mail data. As described above, when the keyword is added to the user name part, the process of the mail transmission server 11 is the same as the conventional process.

The processes of FIGS. 2 and 3 are processes when the mailer program 31 is a new mailer program configured to process according to the present embodiment. However, the mailer program 31 does not necessarily have to perform the processing shown in FIGS. In that case, the conventional mailer program is used, and the auxiliary program 33 is further installed, and the auxiliary program 3
Let 3 do the processing. The auxiliary program 33 holds an address book in which keywords corresponding to mail addresses are registered.

FIG. 6 shows the processing of the auxiliary program 33.
First, when the user clicks the send button and the mailer program 31 outputs the send mail data, the auxiliary program 33 receives the send mail data (step S21). Then, the destination address included in the mail header of the transmitted mail data is extracted, and it is determined whether the keyword corresponding to the destination address has been registered in the address book (step S23). This address book is, for example, as shown in FIG. 7, and keywords are stored in correspondence with mail addresses.

If the keyword corresponding to the destination address is registered in the address book, the keyword is read from the address book (step S25), and step S
Move to 27. If the keyword corresponding to the destination address is not registered in the address book, the display prompting the keyword input is displayed on the display device of the user terminal 3 (step S31). At this stage, if a keyword is input in the keyword input field, the input keyword is held (step S35). If the input of the keyword is canceled, the process proceeds to step S29. That is, the mail transmission processing as in the past is executed.

After step S35 or step S25, the keyword input or read from the address book is added to the user name of the destination address of the transmitted mail,
The data is stored in the storage device (step S27). This is the same process as step S15 of FIG. Then, the auxiliary program 33 transmits the transmitted mail data to the mail transmission server 11 (step S29). In response, the mail transmission server 11 identifies the domain name of the destination address included in the mail header of the transmitted mail data, connects to the mail reception server 5 corresponding to the domain name, and transmits the transmitted mail data. To do.

In this way, the auxiliary program 33 can achieve the object of the present embodiment even if the mailer program currently distributed is used as it is.

Next, the processing of the mail receiving server 5 will be described with reference to FIG. When the mail data is received from the mail transmission server 11 (step S41), the user name portion of the destination address included in the mail header of the mail is inspected (step S43). Here, it is examined whether the keyword can be extracted. For example, when the keyword is added to the user name in a form in which a non-character delimiter code is added as shown in FIG. 5, it may be inspected whether the non-character delimiter code exists. If a non-character delimiter code exists, the keyword is extracted and stored in the storage device. If the keyword is added by a method other than that shown in FIG. 5, it is necessary to extract the keyword according to that method.

Then, the mail receiving server 5 determines whether or not the keyword is detected (step S45). If no keyword is detected, the same process as the conventional process is performed. That is, it is confirmed whether or not there is a mailbox (storage area in the mailbox 51) corresponding to the user name (step S57). If the mailbox corresponding to the user name does not exist, since it is an error, a non-delivery notification mail is sent to the sender (step S61). Then, the process ends. If the mailbox corresponding to the user name exists, the mail data is stored in the storage area in the mailbox 51 corresponding to the user name (step S5).
9). Then, the process ends.

On the other hand, when the keyword is detected in the user name portion of the destination address (step S45: Y
es root), the part other than the keyword of the user name part (eg taro ■bluesky□@xyz.ne.jp, ■ blu
The keyword DB 53 is searched by using taro) from which esky □ has been removed (step S47). An example of the data stored in the keyword DB 53 is shown in FIG. In the example of FIG. 9, a user name, a confirmation keyword, and a message are stored. The message is sent to the sender when the keyword extracted from the destination address matches the confirmation keyword stored in the keyword DB 53.

Then, the mail receiving server 5 extracts the confirmation keyword from the confirmation keyword and the destination address if the confirmation keyword is found in the keyword DB 53 by a portion other than the keyword of the user name portion of the destination address. It is determined whether the entered keyword matches (step S49). If the confirmation keyword is not found in the keyword DB 53, or if the confirmation keyword and the extracted keyword do not match, a non-delivery notification mail is transmitted to the sender (step S55). Then, the process ends.

On the other hand, when the confirmation keyword is found and the confirmation keyword and the extracted keyword match, the mailbox specified by the portion other than the keyword of the user name (storage area of the mailbox 51). The received mail data is stored in (step S5)
1). Then, a reception notification mail including a message corresponding to the user name stored in the keyword DB 53 is generated and transmitted to the sender (step S53). As a result, if the e-mail address and the keyword coincidentally coincide with each other but are sent by mistake, the sender user will receive the receipt notification mail, and if the recipient-specific message contained in the receipt notification mail is read, the sender In some cases, the user may notice a wrong delivery.
For example, in the example of FIG. 9, the name is “Taro Yamada”,
Because it is different from "Yamada Taro", there are times when you may notice.

On the other hand, the conventional mail receiving server B (1) which cannot execute the processing (FIG. 8) according to the present embodiment by mistake.
When the mail subjected to the processing according to the present embodiment is transmitted to 3), the processing as shown in FIG. 10 is performed. That is, the mail receiving server B (13) receives the mail data from the mail transmitting server 11 (step S6).
5) Check the user name of the destination address. Then, if the user name is as shown in FIG. 5, a delimiter code that cannot be used as a mail address is used, so an error is found in the user name portion of the destination address (step S67). Therefore, the non-delivery notification mail is sent to the sender (step S69).

By performing the above processing,
Even if the wrong email address happens to exist, if the keywords do not match, misdelivery can be prevented. If the mail receiving server erroneously sends the mail to the conventional mail receiving server that cannot perform the processing according to the present embodiment, an error notification is sent to the sender.
The sending user may notice an erroneous delivery.

Further, the mailer program 31 may be the same as the conventional one, and even the mailer program 31 for carrying out the processing according to the present embodiment can send a mail without adding a keyword. Further, the mail receiving server 5 can also perform the processing as in the conventional case even if the keyword is not added to the destination address as in the conventional case. If the confirmation keyword is not registered in the keyword DB 53 of the mail receiving server 5 and the confirmation keyword is not disclosed, the mail receiving server 5 performs the conventional process. Therefore, the conventional mail sending / receiving interface is maintained.

Finally, in the method of the present embodiment, for example, when a keyword is simply incorporated in the user name (hereinafter referred to as the second
Method. ) And confirm that the method of the present embodiment is less likely to be erroneously sent.

For example, in the method according to the present embodiment,
The keyword bluesky shall be specified in taro@xyz.ne.jp. In the second method, for example, taro.blues
Use ky@xyz.ne.jp as your email address.

Here, the user name is erroneously specified as tarou@xyz.ne.jp in the method according to the present embodiment, and tarou.bluesky@xyz.ne.jp is specified in the second method. It is assumed to have been done. In this case, what is erroneously sent is tarou@xyz.ne.j in the method according to the present embodiment.
p exists and keyword b for this address
This is the case when luesky is specified. In the second method, the error is simply sent when tarou.bluesky@xyz.ne.jp exists. In the method according to the present embodiment, the keyword for tarou@xyz.ne.jp is unique, whereas in the second method, many addresses tarou. To @ xyz.ne.jp may exist. Therefore, the method according to the present embodiment has a lower error delivery rate.

In the method according to the present embodiment, the domain name is mistakenly designated as taro@xy2.ne.jp, and the second
It is assumed that taro.bluesky@xy2.ne.jp is specified in the method of. In this case, what is wrongly sent is the domain name (xy2.ne.jp) in the method according to the present embodiment.
Is used, the mail receiving server corresponding to the domain name is the mail receiving server according to the present embodiment, the same user name (taro) exists, and its keyword is bluesky. . In the second method, the error is sent when the domain name (xy2.ne.jp) exists and the same user name (taro.bluesky) exists. Although the probability that the domain name exists is the same, in the method according to the present embodiment, the mail receiving server is not erroneously sent unless it is the mail receiving server according to the present embodiment, whereas in the second method. It may be sent by mistake. Further, even when the mail receiving server is the mail receiving server according to the present embodiment, in the method according to the present embodiment, the keyword for taro@xy2.ne.jp is unique, whereas the second In the method, tarou.
There can be many addresses such as ~@xyz.ne.jp. Therefore, the method according to the present embodiment has a lower error delivery rate.

Further, the keyword or the portion corresponding to the keyword is mistaken, and the keyword buluesky is specified for taro@xyz.ne.jp in the method according to the present embodiment, and taro.buluesky in the second method. @ xyz.ne.jp
Consider the case where you have specified. In this case, erroneous transmission cannot occur in the method according to the present embodiment. In the second method, if taro.buluesky@xyz.ne.jp actually exists, it will be erroneously sent. Therefore, the method according to the present embodiment has a lower error delivery rate.

As described above, this embodiment has a relatively low error rate.

The embodiment of the present invention has been described above.
The present invention is not limited to this. For example, although the auxiliary program 33 also has a configuration in which the sender user is requested to input a keyword at the time of transmission, the auxiliary program 3
In item 3, the keyword can be added only when the keyword is registered in advance in the address book. On the contrary, the auxiliary program 33 may have a configuration in which the address book is not held, a keyword is requested each time it is sent, and the keyword is added only when the keyword is input.
FIG. 9 shows a configuration in which both the confirmation keyword and the message are stored in the keyword DB 53, but another D
It may be configured to be stored in B or the like.

(Supplementary Note 1) A keyword adding step of adding a keyword designated as a confirmation keyword preset by the destination user of the electronic mail to the address designated as the destination of the electronic mail and storing the keyword in the storage device. And a step of transmitting electronic mail data including the address to which the keyword is added to an electronic mail transmission server, the program causing a computer to execute.

(Supplementary Note 2) In the keyword adding step, the keyword designated as the confirmation keyword preset by the destination user of the electronic mail at the address designated as the destination of the electronic mail can be separated from the address. A program according to appendix 1, wherein the program is added in a form and stored in a storage device.

(Supplementary Note 3) In the keyword adding step, the keyword specified as the confirmation keyword preset by the destination user of the electronic mail at the address specified as the destination of the electronic mail is separated from the address. And a step of storing the program in a storage device together with the program.

(Supplementary Note 4) In the keyword adding step, at least the keyword designated as the confirmation keyword preset by the destination user of the electronic mail is added to the user name portion of the address designated as the electronic mail destination. The program according to Appendix 1, wherein the program is added with a delimiter code from the user name portion of the address and stored in a storage device.

(Supplementary note 5) The program according to Supplementary note 4, wherein the delimiter code is a prohibition code having no other meaning.

(Supplementary note 6) The program according to supplementary note 1 for causing a computer to further execute the step of reading out the keyword previously registered in the storage device corresponding to the address.

(Supplementary Note 7) A keyword extraction step of extracting the keyword and storing it in the storage device when the keyword specified as the confirmation keyword preset by the destination user is added to the destination address of the received mail. And a determination step of determining whether the extracted keyword is a confirmation keyword preset by the destination user, and when the keyword is the confirmation keyword, a storage area for the destination address is stored. A program for causing a computer to execute the step of storing the mail data.

(Supplementary Note 8) When the keyword extraction step detects a predetermined code in the destination address of the received mail, the keyword designated as the confirmation keyword preset by the destination user is added. The program according to note 7, further comprising a step of determining

(Supplementary Note 9) In the determination step, the confirmation keyword corresponding to the user name portion of the destination address from which the keyword has been removed is searched in the registration confirmation keyword storage unit, and the extracted keyword is The program according to appendix 7, wherein the program is compared.

(Supplementary note 10) When the keyword is the confirmation keyword, the program according to supplementary note 7 for causing the computer to further execute the step of transmitting the reception confirmation message designated by the destination user to the transmission source. .

(Supplementary Note 11) A keyword addition means for adding a keyword designated as a confirmation keyword preset by the destination user of the electronic mail to the address designated as the destination of the electronic mail and storing it in the storage device. A means for transmitting electronic mail data including an address to which the keyword is added to an electronic mail transmission server.

(Supplementary Note 12) When a keyword designated as a confirmation keyword preset by the destination user is added to the destination address of the received mail data, the keyword is extracted and stored in the storage device. An extracting means, a determining means for determining whether the extracted keyword is a confirmation keyword preset by the destination user, and a storage for the destination address when the keyword is the confirmation keyword A means for storing the mail data in an area.

[0063]

As described above, it is possible to provide a novel technique for preventing erroneous sending of electronic mail.

Further, even if the message is mistakenly sent, the user on the sending side of the electronic mail can recognize it.

Further, it is possible to prevent erroneous sending of electronic mail while maintaining the conventional electronic mail transmission / reception system.

[Brief description of drawings]

FIG. 1 is a diagram showing a system configuration example according to an embodiment of the present invention.

FIG. 2 is a diagram showing a processing flow (No. 1) of a mailer program. .

FIG. 3 is a diagram showing a processing flow (No. 2) of the mailer program.

FIG. 4 is a diagram showing an example of an address book for a mailer program.

FIG. 5 is a diagram for explaining a method of adding a keyword to a mail address according to the present embodiment.

FIG. 6 is a diagram showing a processing flow of an auxiliary program.

FIG. 7 is a diagram showing an example of an address book for an auxiliary program.

FIG. 8 is a diagram showing a processing flow of a mail receiving server.

FIG. 9 is a diagram showing an example of data stored in a keyword DB.

FIG. 10 is a diagram showing a processing flow when a conventional mail receiving server receives a mail having a destination address including a keyword.

[Explanation of symbols]

1 Internet 3 user terminals 5 mail receiving server 7 public network 9 connection server 11 Mail sending server 13 Mail receiving server B 31 Mailer Program 33 Auxiliary program 51,131 mailbox 53 keyword DB

Claims (5)

[Claims] 1. A keyword adding step of adding a keyword specified as a confirmation keyword preset by a destination user of the electronic mail to an address specified as a destination of the electronic mail and storing the keyword in a storage device. A program for causing a computer to execute a step of transmitting electronic mail data including an address to which a keyword is added to an electronic mail transmission server. 2. The keyword adding step includes, in a user name portion of an address designated as a destination of an electronic mail, at least a keyword designated as a confirmation keyword preset by a destination user of the electronic mail of the address. 2. The program according to claim 1, wherein the program is added together with a delimiter code from the user name portion and stored in a storage device. 3. The program according to claim 1, further causing a computer to execute a step of reading out the keyword registered in advance in a storage device corresponding to the address. 4. A keyword extraction step of extracting the keyword when the keyword designated as a confirmation keyword preset by the destination user is added to the destination address of the received mail, and storing the keyword in a storage device. A determination step of determining whether or not the extracted keyword is a confirmation keyword preset by the destination user; and when the keyword is the confirmation keyword, the mail is stored in a storage area for the destination address. A step of storing the data of and a program for causing a computer to execute. 5. The program according to claim 4, wherein when the keyword is the confirmation keyword, the computer further executes the step of transmitting the reception confirmation message designated by the destination user to the transmission source.