JP3527090B2 - Distributed mail system, recording medium recording mail arrival confirmation program, and mail server device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distributed mail system, a recording medium having a mail arrival confirmation program recorded therein, and a mail server device , and a distributed mail system and mail for managing electronic mail in each of a plurality of mail servers. Recording medium recording the arrival confirmation program
And a mail server device .

[0002] In recent years, the use of electronic mail has advanced due to the widespread use of personal computers. There is also a demand for guaranteeing that the data has definitely arrived at the transmission destination, such as ordering data using electronic mail.

[0003]

2. Description of the Related Art As an electronic mail system, there are a centralized management type mail system for managing electronic mail by a single mail server and a distributed type mail system for managing mail by a plurality of mail servers. Centralized mail systems are relatively good at managing mail, whereas distributed mail systems are flexible and extensible where you can send and receive e-mail wherever you have a mail server. There is.

Conventionally, in a centralized management type mail system, a mail system has been developed which can confirm (delivery confirmation) whether or not the other party has received the transmitted electronic mail. For example, in Japanese Unexamined Patent Publication No. 5-344148, when an inquiry signal as to whether or not an electronic mail addressed to a user having a specific user identification code is sent to the own device is output to an electronic mail central device, E-mail Identify whether the e-mail output by the central device is a read information e-mail or another new e-mail, and if the e-mail is a new e-mail, the read information e-mail indicating that the e-mail has been received. It describes an email device that creates and outputs emails.

[0005]

Since the resources that can be used in the centralized management type mail system can be limited, it is possible to confirm whether or not the other party has received the transmitted electronic mail.
It is also conceivable that the arrival confirmation is operated by a plurality of mail servers by copying the arrival confirmation information between the mail servers. However, since it is necessary to manage the replication of the arrival confirmation information in each of the plurality of mail servers, there is a problem that the scalability is lacking and the operation becomes difficult when the number of mail servers increases.

[0006] Further, there is conventionally terminal-side software for automatically performing the same work as that of a receiver replying to a sender at a user terminal, but it is necessary to set the above-mentioned software in each terminal in advance. However, there is a problem that complicated settings are required for each terminal. The present invention has been made in view of the above points, and it is possible to confirm the arrival of an electronic mail between mail servers having an arrival confirmation function, and it is necessary to copy the arrival confirmation information and manage it in each of a plurality of mail servers. It is an object of the present invention to provide a distributed mail system that does not require complicated settings in individual terminals, a recording medium recording a mail arrival confirmation program, and a mail server device .

[0007]

According to a first aspect of the present invention, in a distributed mail system in which electronic mails are managed by a plurality of mail servers, a unique mail server receives an electronic mail from a terminal. And a send / receive management file registering means for registering the send / mail identification information in a send / receive management file, and a receive request When a terminal connected to a mail server receives an e-mail to which the outgoing mail identification information is added, an arrival confirmation e-mail in which the incoming e-mail identification information including the outgoing mail identification information is recorded is created and The arrival confirmation mail generation means for transmitting to the mail server, and the transmission mail identification information of the received arrival confirmation mail And arrival confirmation control means corresponding email searches the received management file registers that it has arrived at the destination, the transmission mail identification information or reception menu
When you receive an e-mail with
The mail server from which the child mail is sent
It has a transmission / reception confirmation range management means that is managed as a mail server .

As described above, the transmitted mail identification information is added to the electronic mail and transmitted, the transmitted mail identification information is registered in the transmission / reception management file, and an arrival confirmation mail is created and transmitted when the electronic mail is received. A mail server that has an arrival confirmation function and a mail server that does not have an arrival confirmation function in a distributed mail server environment by sending to the original mail server and registering that the email has arrived at the destination in the transmission / reception management file. Even if and are mixed, it is possible to confirm the arrival of e-mail between mail servers that have the arrival confirmation function, and each mail server has a send / receive management file. You don't have to manage each one,
Send email without requiring any complicated settings on individual terminals
Email with identification or incoming email identification
When received, send the mail server that sent the email
To manage as a mail server within the reception confirmation range, which
Whether the mail server has the arrival confirmation function is automatically set.
If the number of mail servers with arrival confirmation function increases,
However, there is no need to make any settings.

According to a second aspect of the present invention, in the distributed mail system according to the first aspect, the transmission / reception management file is searched by an arrival confirmation request from a terminal connected to the mail server and transmitted from the terminal. It has transmission / reception status confirmation means for transmitting information on whether or not the electronic mail has arrived at the destination to the terminal. As described above, in order to transmit the information indicating whether or not the e-mail sent from the terminal has arrived at the destination by searching the transmission / reception management file by the arrival confirmation request from the terminal to the terminal, the e-mail sent from each terminal Arrival confirmation can be done.

[0010]

[0011]

The invention described in claim 3 is the same as claim 1 or
In the distributed mail system described in 2 , the sent mail identification information is composed of a sender address, a send date and time, and a serial number. In this way, since the transmission mail identification information includes the transmission source address, it is possible to know from which terminal the transmission mail identification information registered in the transmission / reception management file is an electronic mail.

The invention according to a fourth aspect is the first to the third aspects.
In any one of the above, the transmission / reception confirmation range management means registers in the transmission / reception management file whether or not the mail server to which the electronic mail is transmitted is a transmission / reception confirmation range mail server. in this way,
In order to register in the transmission / reception management file whether the mail server is within the transmission / reception confirmation range, it is possible to confirm the arrival of each email sent from each terminal, but not the arrival confirmation. The thing can know that, and there is no fear that the email whose arrival cannot be confirmed is mistaken for the email that has not arrived.

According to a fifth aspect of the present invention, the computer adds the outgoing mail identification information, which is unique within the mail server that received the electronic mail from the terminal, to the electronic mail and sends it to the destination mail server. Sending mail identification information adding means, sending and receiving management file registration means for registering the sending mail identification information in a sending and receiving management file,
When the terminal connected to the mail server in response to the reception request receives the e-mail to which the outgoing mail identification information is added, an arrival confirmation mail in which the incoming mail identification information including the outgoing mail identification information is recorded is created and sent. Arrival confirmation mail generation means for transmitting to the original mail server, and arrival confirmation management for registering that the corresponding electronic mail has arrived at the destination by searching the transmission / reception management file based on the transmission mail identification information of the received arrival confirmation mail. Means and said sending
Electronic mail that has received mail identification information or received mail identification information
When you receive the email, the email from which the email was sent is sent.
Server as a mail server within the send / receive confirmation range.
A program for functioning as a transmission / reception confirmation range management means is recorded.

By using this recording medium, the mail server can be provided with an arrival confirmation function, whereby the invention according to claim 1 can be realized. In addition, claim 6
According to the invention described in claim 1, the invention described in claim 1 can be realized.
It

[0016]

1 is a block diagram of an embodiment of a distributed mail system according to the present invention. This distributed mail system is, for example, an Internet mail system.
In the figure, mail servers 10 and 12 constitute a distributed mail system, and only two mail servers are shown here, and these mail servers are mutually connected by a network. In each of the mail servers 10 and 12, in addition to the mail server software unit 14 and the mailbox 15, the transmitted mail management software unit 16, the arrival confirmation management software unit 18, the transmission / reception management file 20, the received mail management software unit 22, and the transmission / reception status confirmation. The soft section 23 is provided. Terminals 24, 26 and the like are connected to the mail servers 10, 12 via a network. The processing programs that operate in the transmitted mail management software unit 16, the arrival confirmation management software unit 18, the received mail management software unit 22, and the transmission / reception status confirmation software unit 23 are stored in the recording medium.

The mail server software unit 14 on the sending side receives an electronic mail transmitted from the sender's terminal 24 via the network from the outgoing mail management software unit 16 to be described later, and selects which mail from the destination address of the electronic mail. It judges whether the terminal of the server destination is connected and transfers the e-mail to the judged mail server. Further, the mail server software unit 14 on the receiving side receives the mail transferred from another mail server via the arrival confirmation management software unit 18, stores the mail in the mail box 15 for each user, and from the terminal 26 of the recipient to the network. Access from the terminal 26 already stored in the mailbox 15.
To the recipient terminal 26.

The outgoing mail management software section 16 of the sending mail server (for example, the mail server 10) is the sender terminal 2
4 to trap (capture) an outgoing e-mail transmitted from the e-mail server 4 and transferred from the e-mail server software unit 14 to the e-mail server on the receiving side (for example, the e-mail server 12), and to send the e-mail uniquely within the mail server 10. The mail identification information SID is added and transferred to the mail server software unit 14, and a record having the sent mail identification information SID as a key (the arrival flag is reset) is written in the transmission / reception management file 20 of the mail server 10. . At this time, the flag within the confirmation function range in the record is
Set if the destination mail server is managed as a mail server within the send / receive confirmation range, and reset if it is not managed as a mail server within the send / receive confirmation range.

The received mail management software section 22 of the mail server 12 on the receiving side, when transmitting the electronic mail read from the mail box 15 to the recipient terminal 26 at the request of the user, traps this electronic mail and adds it. The received mail identification information RID including the SID is created from the transmitted mail identification information SID and the received mail identification information R
Create an arrival confirmation email with your ID. And
The electronic mail from which the outgoing mail identification information SID has been deleted is transmitted to the recipient terminal 26, and the arrival confirmation mail is transferred to the mail server 10 of the transmission source via the network.

The arrival confirmation management software unit 18 detects the arrival confirmation mail transferred from another mail server (for example, the mail server 12), and sends the mail identification information SID included in the received mail identification information RID of the arrival confirmation mail. Is used to search the transmission / reception management file 20, set the arrival flag of the searched record, and transfer normal mail other than the arrival confirmation mail to the mail server software unit 14.

If the received mail is an arrival confirmation mail, the mail server that has transmitted the arrival confirmation mail additionally registers it in the transmission / reception confirmation range management table shown in FIG. 6 as a mail server within the transmission / reception confirmation range. In the transmission / reception confirmation range management table shown in FIG. 6, the number of mail servers within the transmission / reception confirmation range and the mail server ID within the transmission / reception confirmation range are registered.

When the sender terminal 24 requests the mail server 10 to confirm the arrival of a desired electronic mail, the transmission / reception status confirmation software unit 23 causes the transmission / reception management file 20 to indicate the arrival flag of the record in which the corresponding terminal is the transmission source. Look at the,
A message instructing whether or not the corresponding electronic mail has definitely arrived at the terminal of the destination address is transmitted to the sender terminal 24 and displayed.

FIG. 2 shows a flow chart of an embodiment of the electronic mail receiving process executed by the mail server. This process is started by receiving an electronic mail. The e-mail received by the mail server is an e-mail sent from a terminal connected to this mail server, an e-mail addressed to a terminal connected to this mail server, and relayed by this mail server. Although there is electronic mail, it is assumed that the electronic mail relayed by this mail server has already been sent to the relay processing before the electronic mail reception processing.

In FIG. 2, in step S10, it is determined whether or not the received electronic mail includes the transmitted mail identification information SID or the received mail identification information RID, and the transmitted mail identification information SID or the received mail identification information RI.
If D is not included, the process proceeds to step S12, and it is determined from the sender address of the received electronic mail whether this electronic mail is sent from the terminal of the user connected to the mail server.

Here, if it is an electronic mail transmitted from the terminal of the user connected to the mail server, the process proceeds to step S14, and the transmitted mail identification information SID is created.
The transmitted mail identification information SID is composed of, for example, a source address, a transmission date and time, and a serial number so as to be unique within the mail server. Since the outgoing mail identification information SID need only be unique within the mail server, it may be only a serial number. However, since the outgoing mail identification information SID includes the sender address in this way, the transmission / reception management file 20 It is possible to know from which terminal the transmitted mail identification information SID registered in is the electronic mail transmitted.

Thereafter, in step S16, in order to manage the transmitted mail identification information SID, a record using the transmitted mail identification information SID as a key is set in the transmission / reception management file 20.
Register with. Then, in step S18, the original e-mail shown in FIG. 5 (A) is added with the sent mail identification information SID and the sender address to form the e-mail in the form shown in FIG. 5 (B). To the mail server corresponding to and ends the processing cycle.

In step S16, when the record of the form shown in FIG. 5D is registered in the transmission / reception management file 20, the arrival flag of the record is reset and the mail server of the transmission destination sends the mail within the transmission / reception confirmation range. When it is managed as a server, the confirmation function range flag is set. On the other hand, if the email received in step S12 is not sent from the end user's terminal,
If it is transferred from another mail server to the terminal of the user connected to the mail server, the process proceeds to step S20, and the received e-mail is stored in the mailbox 15 of each user and the processing cycle is executed. finish.

If the electronic mail received in step S10 includes the transmitted mail identification information SID or the received mail identification information RID, the process proceeds to step S22.
It is determined that the sender's mail server is a mail server with a send / receive confirmation function, and the mail server ID of this sender's mail server is registered in the send / receive confirmation range management table shown in FIG. 6 as a send / receive confirmation range mail server. to manage.

Next, it is determined whether or not the e-mail received in step S24 is the arrival confirmation mail depending on whether or not the received mail identification information RID is included. If it is not the arrival confirmation mail, that is, the transmission mail identification information. In the case of the electronic mail including the SID, the process proceeds to step S20, the received electronic mail is stored in the mailbox 15 of each user, and the processing cycle ends.

If the electronic mail received in step S24 is an arrival confirmation mail, the flow advances to step S26 to extract and extract the outgoing mail identification information SID included in the received mail identification information RID of the arrival confirmation mail. The sent / received mail identification information SID is searched to search the transmission / reception management file 20 and the arrival flag of the searched record of the form shown in FIG. 5D is set, and further included in the received mail identification information RID of the arrival confirmation mail. Set the arrival date and time in the record and end the processing cycle.

FIG. 3 shows a flowchart of an embodiment of the electronic mail reading process executed by the mail server. This process is started by an e-mail reception request from the user's terminal. In the figure, in step S30, an electronic mail designating the terminal for which the reception request is made by the destination address is read from the mailbox 15. Next, it is determined whether or not the e-mail read in step S32 includes the sent mail identification information SID.

Here, when the electronic mail includes the transmitted mail identification information SID in the form as shown in FIG. 5B, the received mail identification information RID is created based on the transmitted mail identification information SID in step S34. To do. The received mail identification information RID is, for example, the sent mail identification information SI.
It is composed of D itself and reception date and time (current date and time). Then, the received mail identification information RID is recorded in FIG.
An arrival confirmation mail in the form as shown in (1) is created and sent to the sender address included in the e-mail together with the sent mail identification information SID.

Further, in step S36, the mailbox 1
5B, the original e-mail obtained by removing the e-mail identification information SID and the sender address from the e-mail in the form shown in FIG. To finish. If the e-mail is not included in the transmitted mail identification information SID in the form as shown in FIG. 5A in step S32, the e-mail is transmitted to the terminal requesting the reception in step S38 and the processing cycle ends. To do.

FIG. 4 shows a flow chart of an embodiment of the arrival confirmation processing executed by the mail server. This process is started by the arrival confirmation request of the electronic mail from the user's terminal. In the figure, in step S40, the transmission / reception management file 20 uses the address of the terminal for which the arrival confirmation request is made as a key.
Matches the sender address in the outgoing mail identification information SID of 1., reads all the records in the form shown in FIG.
The information (destination, arrival flag, arrival date and time, etc.) of this record is transmitted to the terminal which has made the arrival confirmation request and displayed. This makes it possible to display whether or not each of the emails sent so far has arrived at the destination depending on whether or not the arrival flag has been set. Is also displayed. If the confirmation function range flag is not set, it is displayed that arrival confirmation is impossible. This step S40 is executed to end the processing cycle.

As described above, the transmitted mail identification information SID is added to the electronic mail to be transmitted, the transmitted mail identification information SID is registered in the transmission / reception management file 20, and an arrival confirmation mail is created when the electronic mail is received. Then, the mail server having the arrival confirmation function and the arrival confirmation function in the distributed mail server environment are registered by registering that the e-mail arrives at the destination in the transmission / reception management file 20 by sending the mail to the sender's mail server. Even if you have mixed mail servers that do not have a mail server, you can check the arrival of emails between mail servers that have the arrival confirmation function. There is no need to duplicate the confirmation information and manage it on each of multiple mail servers, and no complicated setting is required on each terminal. .

This makes it possible to confirm the arrival of electronic mails among a plurality of mail servers, which has been impossible in the past, without deteriorating the flexibility and expandability of the distributed mail system, and it is possible to confirm the ordering data. It is possible to send and receive important data by e-mail. Also, when receiving an email with outgoing mail identification information or received email identification information, which mail server has the arrival confirmation function because the mail server that sent the email is managed as a mail server within the send / receive confirmation range. Is automatically set, and even if the number of mail servers with the arrival confirmation function increases, there is no need to make any settings.

Further, by adding the outgoing mail management software unit 16, the arrival confirmation management software unit 18, the transmission / reception management file 20, and the incoming mail management software unit 22 to the existing mail server that does not have the arrival confirmation function, The mail server can have an arrival confirmation function. In addition,
The mail server software unit 14, the sent mail management software unit 16 and steps S14 and S18 correspond to the sent mail identification information adding means, the sent mail management software unit 16 and step S16 correspond to the send / receive management file registration means,
The mail server software unit 14, the received mail management software unit 22, and step S34 correspond to the arrival confirmation mail generation unit, the arrival confirmation management software unit 18 and Step S26 correspond to the arrival confirmation management unit, and the arrival confirmation management software unit 18
The transmission / reception status confirmation software unit 23 and step S22 correspond to the transmission / reception confirmation range management means.

[0038]

As described above, the invention according to claim 1 is
Sending mail identification information adding means for adding sending mail identification information that is unique within the mail server that received the electronic mail from the terminal to the sending mail server, and sending and receiving the sending mail identification information A transmission / reception management file registration means for registering in the management file, and a reception mail identification including the transmission mail identification information when an electronic mail to which the transmission mail identification information is added is received by a terminal connected to a mail server by a reception request. Arrival confirmation mail generating means for creating an arrival confirmation mail recording information and transmitting it to the sender's mail server, and searching the transmission / reception management file by the transmission mail identification information of the received arrival confirmation mail, and sending the corresponding email Arrival confirmation management means for registering arrival at the destination and identification of the sent mail
Receive email with information or incoming email identification information
The email server from which the email was sent.
Send / receive confirmation managed as a mail server within the reception confirmation range
Has range control means .

As described above, the outgoing mail identification information is added to the electronic mail to be sent, the outgoing mail identification information is registered in the transmission / reception management file, and when the electronic mail is received, an arrival confirmation mail is created and sent. A mail server that has an arrival confirmation function and a mail server that does not have an arrival confirmation function in a distributed mail server environment by sending to the original mail server and registering that the email has arrived at the destination in the transmission / reception management file. Even if and are mixed, it is possible to confirm the arrival of e-mail between mail servers that have the arrival confirmation function, and each mail server has a send / receive management file. You don't have to manage each one,
Send email without requiring any complicated settings on individual terminals
Email with identification or incoming email identification
When received, send the mail server that sent the email
To manage as a mail server within the reception confirmation range, which
Whether the mail server has the arrival confirmation function is automatically set.
If the number of mail servers with arrival confirmation function increases,
However, there is no need to make any settings.

The invention according to claim 2 searches the transmission / reception management file according to an arrival confirmation request from a terminal connected to the mail server, and determines whether or not the electronic mail transmitted from the terminal has arrived at the destination. And a transmission / reception status confirmation means for transmitting the information to the terminal. As described above, in order to transmit the information indicating whether or not the e-mail sent from the terminal has arrived at the destination by searching the transmission / reception management file by the arrival confirmation request from the terminal to the terminal, the e-mail sent from each terminal Arrival confirmation can be done.

[0041]

According to the third aspect of the invention, the transmitted mail identification information is composed of a source address, a transmission date and time, and a serial number. In this way, since the transmission mail identification information includes the transmission source address, it is possible to know from which terminal the transmission mail identification information registered in the transmission / reception management file is an electronic mail.

In the invention according to claim 4 , the transmission / reception confirmation range managing means registers in the transmission / reception management file whether or not the mail server to which the electronic mail is transmitted is a transmission / reception confirmation range mail server. In this way, in order to register whether the mail server is within the transmission / reception confirmation range in the transmission / reception management file, it is possible to confirm the arrival of each email sent from each terminal, as well as the arrival confirmation. If it is impossible, the e-mail that cannot confirm the arrival can be mistaken for the undelivered e-mail.

According to the fifth aspect of the present invention, a computer is set as a destination mail server by adding outgoing mail identification information that is unique within the mail server that received the electronic mail from the terminal to the electronic mail. Sending mail identification information adding means for sending, sending and receiving management file registration means for registering the sending mail identification information in a sending and receiving management file, and an electronic mail to which the sending mail identification information is added at a terminal connected to a mail server in response to a reception request When an email is received, an arrival confirmation email generating means for creating an arrival confirmation email in which the received email identification information including the transmitted email identification information is recorded and transmitting it to the sender mail server, and transmitting the received arrival confirmation email Searching the transmission / reception management file based on the mail identification information, and the corresponding email has arrived at the destination. And the arrival confirmation management means to register, before
Has sent mail identification information or received mail identification information
When an email is received, the sender of the email
Manage the mail server as a mail server within the send / receive confirmation range
It records the program for functioning as a transmission / reception confirmation range management means .

By using this recording medium, the mail server can be provided with an arrival confirmation function, whereby the invention according to claim 1 can be realized. In addition, claim 6
According to the invention described in claim 1, the invention described in claim 1 can be realized.
It

[Brief description of drawings]

FIG. 1 shows a configuration diagram of an embodiment of a distributed mail system of the present invention.

FIG. 2 is a flowchart of an example of an electronic mail reception process executed by a mail server.

FIG. 3 is a flowchart of an example of an electronic mail reading process executed by a mail server.

FIG. 4 is a flowchart of an embodiment of an arrival confirmation process executed by a mail server.

FIG. 5 is a diagram showing forms of records of an electronic mail, an arrival confirmation mail, and a transmission / reception management file used in the distributed mail system of the present invention.

6 is a diagram showing a transmission / reception confirmation range management table.

[Explanation of symbols]

10,12 Mail server 14 Mail server software section 15 mailbox 16 Outgoing mail management software 18 Arrival Confirmation Management Software Department 20 Transmission and reception management file 22 Received mail management software 23 Transmission / reception status confirmation software section 24, 26 terminals

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H04L 12/58 G06F 13/00

Claims (6)

(57) [Claims] 1. A distributed mail system that manages electronic mails in each of a plurality of mail servers, by adding outgoing mail identification information that is unique within the mail server that received the electronic mail from the terminal to the electronic mail. Sending mail identification information adding means for sending to the destination mail server, sending / receiving management file registration means for registering the sending mail identification information in a sending / receiving management file, and sending mail identification by a terminal connected to the mail server by a reception request Arrival confirmation mail generation means for creating an arrival confirmation mail in which the received mail identification information including the transmission mail identification information is recorded and transmitted to the sender mail server when the electronic mail with the information added is received; Send the confirmation email of the received mail and search for the send / receive management file based on the mail identification information And arrival confirmation management means for registering that the email has arrived in the destination, lifting the outgoing mail identification information or the received mail identification information
When the e-mail is received, the sender of the e-mail
Mail server as a mail server within the send / receive confirmation range
A distributed mail system having a transmission / reception confirmation range management means for management . 2. The distributed mail system according to claim 1, wherein the transmission / reception management file is searched by an arrival confirmation request from a terminal connected to the mail server, and an email sent from the terminal arrives at a destination. A distributed mail system having a transmission / reception status confirmation means for transmitting information on whether or not the mail has been sent to the terminal. 3. The distributed mail system according to claim 1 , wherein the sent mail identification information is a sender address and a sent date and time.
A distributed mail system that consists of a serial number and a serial number . 4. The distributed mail system according to claim 1 , wherein the transmission / reception confirmation range management means is the transmission / reception management file.
The mail server to which the email is sent
It is characterized by registering whether it is a mail server in the area
A distributed mail system. 5. A computer is used as an electronic mail from a terminal.
Sent mail identification that is unique within the mail server that received the
A mail server to which information is added to the e-mail and sent
The sending mail identification information adding means to be sent to the device and the sending mail identification information are registered in the sending / receiving management file.
The transmission / reception management file registration means that enables the transmission and the transmission by the terminal connected to the mail server
E-mail with the received e-mail identification information is received
In this case, received mail identification information including the sent mail identification information
Create an arrival confirmation email that records the
The arrival confirmation mail generation means to be sent to the server and the sent mail identification information of the received arrival confirmation mail
Search the send / receive management file and find the corresponding e-mail
Arrival confirmation management means for registering arrival at the destination
And has the above-mentioned sent mail identification information or received mail identification information
When the e-mail is received, the sender of the e-mail
Mail server as a mail server within the send / receive confirmation range
To function as a transmission / reception confirmation range management means to be managed
A computer-readable record of the program
Recording medium. 6. An electronic mail is sent to each of a plurality of mail servers.
Mail server device of the distributed mail system that manages
The device receives the e-mail from the terminal and sends it uniquely within the device itself.
Email identification information is added to the email to
Sending mail identification information adding means to be sent to the mail server
And register the sent mail identification information in the send / receive management file.
The sending / receiving management file registration means and the sending
When an e-mail with identification information is received,
Record received mail identification information including sent mail identification information
Created arrival confirmation email and send it to the sender's mail server
It depends on the arrival confirmation email generation method to be sent and the sent email identification information of the received arrival confirmation email.
Search the send / receive management file and find the corresponding e-mail
It has arrival confirmation management means for registering that it has arrived at the destination, and the sent mail identification information or the received mail identification information.
When the e-mail is received, the sender of the e-mail
Mail server as a mail server within the send / receive confirmation range
Characterized by having a transmission / reception confirmation range management means for managing
A mail server device that does .