JP2004064103A - Electronic mail transfer method, electronic mail transfer program, and electronic mail transfer server - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic mail transfer method whereby an electronic mail transfer server can be connected to a receiver side mail server without imposing a load onto the receiver side mail server even when the receiver side mail server is heavy loaded, can maintain the connection, and further decrease the connection processing amount even in the case of transmitting many electronic mail items so as to relive the load of a network. <P>SOLUTION: In the electronic mail transfer method, after collecting recipient mail addresses in a plurality of electronic mail items 24 whose transmission is awaited by each of the same destination domains, the transfer server 2a is directly connected to a mail server of a destination domain not through a transfer channel of a relay server from a remote port of the transmission server 2a, discriminates whether or not the mail box of each of the collected recipient mail addresses exists in the mail server of the destination domain, and directly transmits the electronic mail items only to the recipient mail addresses wherein the mail box exists in the mail server of the destination domain. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an electronic mail transfer method, an electronic mail transfer program, and an electronic mail transfer server for transferring an electronic mail.
[0002]
[Prior art]
As is well known, between different types of telephones (mobile telephones, PHS 、), between telephones of different telephone companies, and these telephones (home telephones and mobile telephones having an e-mail transmission / reception function that can be connected to the Internet with these telephones). The number of e-mail users between a telephone and a PHS @) and a personal computer (hereinafter, also simply referred to as "PC") has increased, and various information distribution services have been provided to these telephones and PCs. A large number of companies have been participating.
[0003]
Generally, SMTP (Simple Mail Transfer Protocol) is used for sending and receiving e-mail, and an e-mail client having an e-mail address is installed on a telephone or a PC (hereinafter, also simply referred to as "terminal"). When an e-mail is created by the mailer and the e-mail is transmitted, the e-mail is temporarily transmitted to a mail server under the jurisdiction of the e-mail address and stored in a spool area of the mail server. In the jurisdiction mail server, the e-mails collected in the spool area are taken out one by one, and the domain information is obtained by the destination domain information on the right side of "@" included in the e-mail address (recipient e-mail address) of the recipient. If it points to itself, the e-mail is delivered to the mailbox specified by the user information on the left side of "@". If the domain information does not point to itself, the address of the destination is sent to the DNS @ server. And sends the e-mail based on the obtained global IP address. If the global IP address of the domain information cannot be obtained, the user is notified that the transmitted e-mail cannot be sent.
[0004]
For the e-mail of the destination domain for which the global IP address was obtained, the mail server under the jurisdiction becomes the sending mail server, specifies the global IP address, and tries to connect from port 25 to port 25 of the receiving mail server. If the connection fails, return the e-mail to be transferred to the spool area, and if the connection is successful and the connection between the sending mail server and the receiving mail server can be established, The e-mail is transmitted based on the procedure of the communication method RFC821. That is, between the SMTP of the sending mail server (sending SMTP) and the SMTP of the receiving mail server (receiving SMTP), the sending mail server sends a "HELO" command to notify the receiving mail server of the start of transmission. And the receiving mail server that has received the "HELO" command sends a response code "250 @" to notify the normal end of the requested command, and the sending mail server receives an e-mail after receiving the response code "250 @". Command "MAIL @ FROM: {<sender mail address>}" to notify the sender's e-mail address, and the command "RCPT @ TO" to notify the recipient e-mail address after receiving the response code "250 @" from the receiving mail server. : <Recipient email address> ” To. Upon receiving the “RCPT @ TO: {<recipient mail address>}” command, the receiving mail server extracts the domain information on the right side of “@” included in the “recipient mail address”, and the domain information points to itself. If the user information on the left side of "@" is registered in the reception refusal list, or if the domain information does not point to itself, as a result of the inquiry about the destination address to the DNS @ server, If the global IP address of the domain information could not be obtained, an error code is transmitted to the transmitting mail server. If distribution and transfer are possible, the response code "250 @" is transmitted. Upon receiving the response code "250 @", the transmitting mail server transmits a "DATA" command notifying the start of the transmission of the text data (text information), and the response code "354" for starting the input of the text data from the receiving mail server. After receiving "Start \ mail \ input: \ end \ with \ <CRLF> \. <CRLF> \", the main body data of the e-mail and "@ <CRLF> @. <CRLF> @" indicating the end of the e-mail are transmitted, and the response code " After receiving "$ 250", a "QUIT" command for notifying the end of transmission is transmitted. The receiving mail server transmits a response code "221 #" notifying the closing of the connection to the "QUIT" command to the transmitting mail server, so that the receiving mail server is located between the transmitting mail server and the receiving mail server. The connection is broken.
[0005]
Then, the receiving mail server receiving the e-mail whose domain information does not point to itself becomes a relay server (sending mail server), and the relay server and the mail of the destination domain of the e-mail. The e-mail is transmitted by a transfer channel (a communication path between the sending SMTP and the receiving SMTP for exchanging commands, responses, and mail texts) between the server and the receiving mail server which is the next relay server. It is designed to be transferred.
[0006]
[Problems to be solved by the invention]
With the spread of telephones that can send and receive e-mail, not only individual private mail has increased, but also broadcast mails such as various announcements and advertisements sent to terminals have been increasing. The e-mail is connected to the port 25 of the sending mail server from the port 25 of the receiving mail server, and then connected to the SMTP of the sending mail server and the SMTP of the receiving mail server based on the communication method. The e-mail is frequently transmitted and received, so that the operation load on the receiving mail server that frequently receives these e-mails is significantly increased, whereby the path bandwidth to the receiving mail server is suppressed and a connection is established. There is a phenomenon that you cannot do it.
[0007]
That is, in the receiving mail server, a load is applied to the receiving process itself in proportion to the number of received e-mails, and the connection request of the transmitting mail server which transmits the e-mail without interruption like the broadcast mail is required. If a connection request or the like by another sending-side mail server is interrupted in the procedure of the communication method at the start of connection, the transmission of the e-mail during that time is suspended, E-mail is delayed or delivery / forwarding is not possible.
[0008]
In addition, in the sending mail server, the sending mail server acts as a relay server to transfer the received e-mail to the receiving mail server. In response to the mail transmission request, the process of receiving the forwarded mail from another sending mail server as the receiving mail server and delivering it to the mailbox of the e-mail client is performed. If an e-mail transmission request occurs frequently, the e-mail will not be retained after the connection with the receiving e-mail server is started, and the e-mail will be in a no-response state. Unlike notification processing to the e-mail client due to the absence of an address etc., basically 4 hours The transmission process is executed until the connection succeeds for 5 days. Therefore, if a large number of e-mails such as broadcast mails cannot be connected to the receiving mail server, a large amount of Repetition of the transmission process for five days until the mail data succeeds causes traffic congestion in the Internet network. Further, as a result, the e-mail that could not be transferred is notified to the sender in the broadcast mail in a concentrated manner, exceeding the capacity of the spool area of the jurisdiction mail server, causing a high load and being unable to be processed. Is occurring.
[0009]
Further, in the entire network, a phenomenon that a mail server cannot be connected frequently occurs due to traffic congestion in the Internet network, so that a characteristic of electronic mail, that is, quick delivery and reliable reception cannot be utilized.
[0010]
Therefore, the present inventor can connect without burdening the receiving mail server even when the receiving mail server is in a high load state, can maintain the connection, and furthermore, can handle a large amount of data. As a technical issue, to provide an e-mail transfer means that can reduce the network load by reducing the connection process when sending e-mail, as a result of repeated research and experiments to realize this, the Internet The receiving mail server on the network is specified by the IP (Internet Protocol) located in the layer, and the TCP (Transmission Control Protocol) located in the transport layer is used to change the port 25 of the transmitting mail server to the port 25 of the receiving mail server. Connection to port After a connection is established between port 25 of the sending mail server and port 25 of the receiving mail server, processing is passed to the application layer, which is an upper layer of the transport layer. In this case, since the communication protocol is determined based on the port number of the TCP @ header and the data is passed to the SMTP using the 25th port, the 25th port of the receiving mail server cannot be connected due to a high load. If the e-mail is forwarded based on the analysis of the current situation that the connection cannot be established, and even if the connection can be established, the SMTP of the receiving mail server becomes unresponsive under heavy load, Direct connection from the remote port of the mail server to the receiving mail server of the e-mail destination domain To establish a direct connection between the remote port of the sending mail server and the remote port of the receiving mail server without going through the transfer channel of the relay server, If the data is passed to port 25, the connection is not established between port 25 of the sending mail server and port 25 of the receiving mail server. Can easily connect to the receiving mail server, and by passing the data from the remote port of the receiving mail server to the SMTP of port 25, the receiving mail server becomes the contact point of port 25 as a result. However, since the sending mail server is not port 25, the SMTP of the receiving mail server Is not affected by the SMTP of the sending mail server, so it is possible to maintain the connection without putting a burden on the receiving mail server, and that the forwarded e-mail is sent to the same destination domain. After summarizing each data, it is connected directly to the receiving mail server of the destination domain by the same method, and whether or not each electronic mail can be delivered by the receiving mail server of the destination domain while the connection is established. If only the e-mail received by the receiving mail server is sent after the judgment, the connection processing can be reduced even when a large amount of e-mail is sent, so that the network load can be reduced. The above-mentioned technical problem has been achieved by obtaining remarkable knowledge.
[0011]
[Means for Solving the Problems]
The technical problem can be solved by the present invention as described below.
[0012]
That is, in the e-mail transfer method according to the present invention, the transfer server collects the recipient e-mail addresses of the plurality of e-mails waiting to be transmitted for each of the same destination domains, and then transmits the e-mail from the remote port of the transfer server to the relay server. By directly connecting to the mail server of the destination domain without passing through the transfer channel, it is determined whether or not the mailbox of each of the grouped recipient mail addresses exists in the mail server of the destination domain. The electronic mail is directly transmitted to the mail server of the destination domain only to the recipient mail address where the mailbox exists.
[0013]
Further, in the electronic mail transfer method according to the present invention, after the transfer server collects the recipient mail addresses of the plurality of waiting e-mails having the same body information for each of the same destination domains, the remote The port directly connects to the mail server of the destination domain without passing through the transfer channel of the relay server, and determines whether the mailbox of each of the grouped recipient mail addresses exists in the mail server of the destination domain. After the determination, the electronic mail is directly transmitted to the mail server of the destination domain only to the recipient mail address where the mailbox exists.
[0014]
Further, in the electronic mail transfer method according to the present invention, the transfer server collects the recipient mail addresses of the plurality of e-mails waiting to be transmitted via the Internet for each of the same destination domains, and Whether the mailbox of each of the grouped recipient mail addresses is directly connected from the remote port to the mail server of the destination domain without passing through the transfer channel of the relay server and exists in the mail server of the destination domain. Then, an e-mail is sent directly to the mail server of the destination domain only for the recipient e-mail address where the mailbox exists, and for the recipient e-mail address where the mailbox does not exist, the recipient e-mail address One e-mail with the body text as the body information for each sender e-mail address It is intended to be sent to the e-mail address.
[0015]
Further, in the electronic mail transfer method according to the present invention, the transfer server may set the recipient mail addresses of a plurality of e-mails waiting to be transmitted that have the same body information received via the Internet for each of the same destination domains. After the collection, the mail server of each destination mail address is directly connected from the remote port of the transfer server to the mail server of the destination domain without passing through the transfer channel of the relay server, and the mail of the destination mail address of the destination is mailed in the destination domain. The e-mail is sent directly to the mail server of the destination domain only for the e-mail address where the mailbox exists, and then the e-mail is received without the mailbox. As for the address, one e-mail with the recipient e-mail address as the body information is sent to the sender e-mail address. It was created for each less is intended to be sent to the sender's e-mail address.
[0016]
Further, in the electronic mail transfer method according to the present invention, the transfer server may include a single body file including the body information of a plurality of e-mails waiting for transmission having the same body information, and a recipient mail of each of the emails. Create one transfer e-mail with one header file that collects addresses for the same destination domain, and send the e-mail of the destination domain from the remote port of the transfer server without passing through the transfer channel of the relay server Determining whether or not the body information can be delivered to the mailbox of the recipient mail address by directly connecting to the server, and determining whether or not the body information of the transfer e-mail is transmitted only to the deliverable recipient mail address; Is sent directly.
[0017]
Further, according to the present invention, in any one of the above-described electronic mail transfer methods for a plurality of e-mails waiting to be transmitted having the same body information, the plurality of e-mails awaiting transmission are limited to a sentence position common to each body information. This is a broadcast mail having different texts, and the text at the common text position is replaced with the same substitute character to have the same text information.
[0018]
Also, the electronic mail transfer program according to the present invention comprises the steps of: causing the transfer server to group recipient mail addresses of a plurality of e-mails waiting for transmission for each same destination domain; Connecting directly from the remote port to the mail server of the destination domain without going through the transfer channel of the relay server; and providing the transfer server with the address of each of the recipient mail addresses collected by the connected mail server of the destination domain. Determining whether a mailbox exists; and causing the transfer server to directly transmit an e-mail only to a recipient mail address where the mailbox exists, to a mail server of the destination domain. It becomes.
[0019]
In addition, the electronic mail transfer program according to the present invention includes the following steps: causing the transfer server to combine recipient mail addresses of a plurality of waiting e-mails having the same body information for each of the same destination domains; Connecting directly from the remote port of the transfer server to the mail server of the destination domain without passing through the transfer channel of the relay server; and connecting the transfer server to the mail server of the destination domain connected to the transfer server. Determining whether a mailbox of the recipient mail address exists; and causing the transfer server to directly send an e-mail only to the recipient mail address having the mailbox to the mail server of the destination domain. And a step.
[0020]
The electronic mail transfer program according to the present invention further comprises: causing the transfer server to group recipient mail addresses of a plurality of e-mails waiting for transmission received via the Internet for each same destination domain; Connecting directly from the remote port of the transfer server to the mail server of the destination domain without going through the transfer channel of the relay server; and connecting the transfer server to the mail server of the destination domain connected to the transfer server. Deciding whether or not a mailbox of each recipient mail address exists; and transmitting the e-mail directly to the mail server of the destination domain only to the recipient mail address having the mailbox by the transfer server. And the transfer server does not have a mailbox It is those which comprise the step of transmitting by creating one e-mail to the payee mail address and text information for each sender email address to the sender mail address for e-mail addresses.
[0021]
In addition, the electronic mail transfer program according to the present invention provides a transfer server with the same recipient information for a plurality of waiting e-mails that are received via the Internet and have the same body information for each destination domain. And the step of causing the transfer server to directly connect to the mail server of the destination domain from the remote port of the transfer server without passing through the transfer channel of the relay server; and the step of connecting the destination domain to the transfer server Making the mail server determine whether or not there is a mailbox for each of the grouped recipient e-mail addresses; and transmitting the e-mail to the transfer server only to the recipient e-mail address where the mailbox exists. Sending directly to the mail server of the destination domain, and The recipient mail address box is not present are those which comprise the step of transmitting by creating one e-mail to the payee mail address and text information for each sender email address to the sender mail address.
[0022]
Further, according to the present invention, in the electronic mail transfer program, when the recipient mail addresses of the electronic mail waiting to be transmitted are grouped for each same destination domain, when two or more destination domain names exist. Means that the e-mail transfer program itself is copied by one less than the number of the destination domain names, and the remaining different domains except the destination domain of the mail server connected by the transfer server by the e-mail transfer program itself are The mail server in the destination domain is connected by a transfer server based on a copied copy electronic mail transfer program.
[0023]
In addition, the electronic mail transfer program according to the present invention may provide a transfer server with a single body file including the body information of a plurality of e-mails waiting for transmission having the same body information, and a recipient mail of each of the electronic mails. Creating a single transfer e-mail having a single header file with the addresses grouped for the same destination domain; and allowing the transfer server to bypass the transfer port of the relay server from the remote port of the transfer server. Connecting directly to the mail server of the destination domain; causing the transfer server to determine whether the body information can be delivered to the mailbox of the recipient mail address; For directly sending the body information of the forwarding e-mail only to the intended recipient e-mail address. Those comprising and.
[0024]
Also, in the present invention, in any one of the above-described e-mail transfer programs for a plurality of e-mails waiting to be transmitted having the same body information, the plurality of e-mails waiting to be transmitted include only a text position common to each body information. This is a broadcast mail having different texts, and the text at the common text position is replaced with the same substitute character to have the same text information.
[0025]
Further, the electronic mail transfer program according to the present invention includes a step of the transfer server classifying the plurality of e-mails waiting for transmission for each same sender, and the step of the transfer server classifying the plurality of e-mails classified for each same sender into the same text. A step of classifying the information for each same body, and a step of the transfer server taking out a recipient mail address of the e-mail classified for each body from the header file of each of the e-mails and compiling the same for each same destination domain; Creating one transfer e-mail consisting of one header file and the body file of the same body information, and the transfer server is configured to transfer the destination domain from the remote port of the transfer server without passing through the transfer channel of the relay server. Directly connect to the mail server, and the mailbox of each recipient e-mail address will be Determining whether or not the mail information exists in the mail server of the destination domain, and the transfer server directly sends the body information of the transfer e-mail to the mail server of the destination domain only to the recipient mail address where the mailbox exists. Transmitting, and for the recipient mail address where the mailbox does not exist, the transfer server creating one e-mail for each sender mail address with the recipient mail address as the body information and transmitting to the sender mail address And
[0026]
Further, in the present invention, in the electronic mail transfer program for generating an electronic mail for transfer, after the electronic mail for transfer is created, two or more destination domains are added to a recipient mail address of a header file of the electronic mail for transfer. If the name exists, the e-mail transfer program itself is copied by one less than the number of the destination domain names, and the destination domain of the mail server connected by the transfer server by the e-mail transfer program itself. The mail servers of the different destination domains except for the above are connected by the transfer server by the copy electronic mail transfer program.
[0027]
Further, an electronic mail transfer server according to the present invention is provided with a storage unit for storing any one of the electronic mail transfer programs, and is operated by the electronic mail transfer program.
[0028]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0029]
Embodiment 1 FIG.
[0030]
FIG. 1 is a block diagram of a computer network including a telephone according to an embodiment of the present invention, FIG. 2 is a block diagram of a mail server shown in FIG. 1, and FIG. 3 is a block diagram of an auxiliary storage unit shown in FIG. 4 is a block diagram showing a configuration when the mail server shown in FIG. 1 operates as a sending / receiving SMTP, FIG. 5 is a block diagram showing a main storage unit shown in FIG. 2, and FIGS. In these figures, 1 is an Internet network, 2 is an SMTP receiving server 2b # (see FIG. 4) for receiving e-mails, and FIG. 6 to FIG. And a transfer server 2a # for transferring based on the e-mail transfer program shown in FIG. It is connected to the Internet network 1. Reference numeral 3 denotes a first PC owned by a first broadcast mail provider (hereinafter, also simply referred to as a "first trader") that transmits information by e-mail, and has a jurisdiction over an e-mail address of the first trader. The ISP server 4 is connected to a plurality of client PCs (represented by reference numeral 5 in FIG. 1) using the ISP server 4 as a provider. Reference numeral 6 denotes a second PC owned by a second broadcast mail provider (hereinafter, also simply referred to as a "second trader") that acquires a global IP address and transmits information on the products handled by the company. . Reference numeral 7 denotes a first receiving-side mail server connected to the Internet 1 via a gateway 8, and the first receiving-side mail server 7 has a plurality of client PCs (in FIG. 9b} is connected. Reference numeral 10 denotes a second receiving mail server owned by the telephone company. The second receiving mail server 10 has a plurality of client PCs (represented by reference numeral 11a in FIG. 1) with the telephone company as a provider. And a telephone network 12 under the jurisdiction of the telephone company. A plurality of mobile telephones (telephones) (telephones) (telephones) which can connect to the Internet and have an e-mail transmission / reception function are connected to the telephone network 12. 1 is representatively shown as 13a #).
[0031]
As shown in FIG. 2, the mail server 2 includes a control determination device 14 including a so-called CPU 14a including a control unit, an operation unit, and a register and a main storage unit 14b #, and is connected to the control determination device 14. And an e-mail transfer program shown in FIGS. 6 to 21 which operates as the SMTP reception server 2b # and operates as the transfer server 2a # based on the procedure of the communication method RFC No. 821. An auxiliary storage device 15 connected thereto, an input determination unit 16 connected to the control determination device 14 for controlling whether or not connection from the Internet 1 can be performed at the OS level, and determining whether or not data output to the Internet 1 is possible at the OS level. And an output determination unit 17 to be controlled. Thereby, the mail server 2 becomes the SMTP receiving server 2b # by the receiving side SMTP when receiving the electronic mail, and becomes the transfer server 2a # by the above-mentioned electronic mail transfer program when transferring the electronic mail. Therefore, the mail server 2 has an SMTP receiving server 2b # for receiving e-mails and a transfer server 2a # for transferring e-mails by respective programs.
[0032]
As shown in FIG. 3, the auxiliary storage device 15 has an SMTP program storage unit 18 storing the SMTP reception server program, and a spool area 19 for temporarily storing the e-mail received by the SMTP reception server 2b #. A transfer program storage unit 20 (storage means) storing the e-mail transfer program, a copy program storage unit 21 used as an area for copying and storing the e-mail transfer program in the transfer program storage unit 20; A work area 22 is provided as an area for copying and storing the e-mail in the spool area 19.
[0033]
Next, the first trader who owns the first PC 3 sets each of the client PCs 9a #, 9b #,... Having the first receiving mail server 7 as the destination domain of the e-mail and the second receiving mail server 10 as the destination domain of the e-mail. , A mobile phone 13a,..., Etc., and a second trader who owns the second PC 6 has the same client PCs 9a, 9b,..., Each client PC 11a,. A case where a broadcast mail is transmitted to...
[0034]
The first trader uses his / her own e-mail address (for example, “daiichi {isp.ne.jp}”) as the sender's e-mail address, and sets each recipient's e-mail address to each e-mail address set in each of the client PCs 9a, 9b. For example, “aaa@a.com”, “ccc ＠ a.com”, “fgt ＠ a.com”, “ert ＠ a.com”, “zes ＠ a.com”), the client PCs 11a. Each e-mail address (for example, "bbb @ b.ne.jp @", "asd @ b.ne.jp @", "wqa @ b.ne.jp @") set in the mobile phone 13a,. 1, each e-mail address (for example, “ddd {c.com}”, “xcv In order to send a broadcast e-mail with "{c.com}" and "opl @ c.com @"), start the mailer installed on the first PC 3 and enter the text of the e-mail to send the e-mail. create. Also, the second trader creates a broadcast mail in the same manner by selecting his / her own e-mail address (for example, “daini@company.com”) as the sender's mail address and selecting the recipient's mail address from, for example, a list of direct mail. I do.
[0035]
Then, the domain name of the SMTP receiving server 2b # in the mail server 2 is set as a destination in the SMTP server input field of each mailer, and a connection is established between the sending SMTP of each mailer and the receiving SMTP of the mail server 2. If it is established, the SMTP receiving server (receiving side mail server) 2b # is operated by the SMTP receiving server program, and the broadcast mail is transmitted to the mail server 2 based on the procedure of the communication method RFC821, and the secondary storage device 15 They are stored in the spool area 19 in the order of reception.
[0036]
Next, an e-mail transfer method will be described.
[0037]
First, as shown in FIG. 6, under the control of the CPU 14a, the electronic mail data 23,... Waiting for transmission stored in the spool area 19 of the auxiliary storage device 15 are copied (copied) to the work area 22 (step s1). ), And then sorts all the copied e-mail data 24,... Waiting for transmission, copied to the work area 22 for each sender (for example, "daiichi @ isp.ne.jp @", "daiini@company.com}). It is determined whether or not the sorting has been completed (step s2). If there is unclassified e-mail data 24, under the control of the CPU 14a, the one uncategorized e-mail data 24 from the work area 22 is stored in the main storage unit 14b. Of the sender's e-mail address written in the header of the e-mail. If the sender area 26 is not in the work area 22, the sender area 26 is created in correspondence with the sender mail address, and the e-mail data 24 is moved from the first memory 25 into the sender area 26 and stored therein. If the sender area 26 corresponding to the sender mail address is already in the work area 22, the e-mail data 24 is moved from the first memory 25 into the sender area 26 and stored, and the process jumps to step s2 (step s3). ). In step s1, the electronic mail data 23,... Of the spool area 19 is copied to the work area 22 so that the electronic mail data 23,. A processed flag is given.
[0038]
If there is no unclassified e-mail data 24 in the work area 22 in the step s2, as shown in FIG. 7, all the e-mail data 24 classified and classified for each sender in the work area 22 are displayed. It is determined whether the sorting for each e-mail having the same body data (body information: body text) has been completed (step s4). If there is unclassified e-mail data 24, it is still the same under the control of the CPU 14a. One uncategorized e-mail data 24 in the sender area 26 in which the classification for each text has not been completed is taken out to the first memory 25 of the main storage unit 14b #, and the same e-mail data corresponding to the text data of the e-mail data 24 has already been obtained. If the sentence area 27 is in the sender area 26, the e-mail data 24 is moved from the first memory 25 to the same sentence area 27. If the corresponding sentence area 27 is not in the sender area 26, the same sentence area 27 corresponding to the body data of the e-mail data 24 is created in the sender area 26 and the e-mail data 24 is stored. The program moves from the first memory 25 to the same sentence area 27 and stores it, and jumps to step s4 (step s5).
[0039]
In step s4, if there is no unclassified e-mail data 24 in each sender area 26, it is determined whether or not the recipient e-mail address of each e-mail has been written for all the same sentence areas 27 as shown in FIG. If it has not been completed yet (step s6), it is determined whether or not the writing of the recipient e-mail address has been completed for all the e-mails in one and the same sentence area 27 (step s7). For example, under the control of the CPU 14a, the unprocessed electronic mail data 24 in the one same sentence area 27 is taken out to the first memory 25 of the main storage unit 14b #, and the recipient mail address (for example, Main memory assigned with data of “aaa {a.com}” corresponding to the one same sentence area 27. Is stored in the second memory 28 of 14b jumps to step 7 (step s8). Thereby, for example, the recipient mail address of each e-mail stored in the same sentence area 27 in the sender area 26 corresponding to the sender mail address “daiichi {isp.ne.jp}”: “bbb@b.ne” .Jp @ "," ccc @ a.com @ "," ddd @ c.com @ ", asd @ b. ne. jp @ "," xcv @ c.com @ "," ert @ a.com @ "," zes @ a.com @ "," wqa @ b.ne.jp @ "," fgt @ a.com @ ", and" opl@c.com ". com @ "is sequentially stored in the second memory 28 following" aaa {a.com} ".
[0040]
In step s7, when the writing of the recipient e-mail address is completed for the one same sentence area 27, the address is stored in the second memory 28 of the main storage unit 14b # under the control of the CPU 14a, as shown in FIG. The recipient mail addresses are rearranged in the second memory 28 for each same destination domain name (step s9). Thereby, for example, "aaa @ a.com @", "ccc@a.com$", "fgt@a.com$", "ert@a.com$", "zes@a.com$", "bbb@b.com." ne.jp @ "," asd @ b.ne.jp @ "," wqa @ b.ne.jp @ "," ddd @ c.com @ "," xcv @ c.com @ ", and" opl @ c.com @ "in that order. Sorted. Next, since the body of each copy-ready e-mail waiting for transmission stored in the same sentence area 27 corresponding to the second memory 28 is the same body information, the body file 24a of one piece of e-mail data 24 is provided. Only the text file 24a # of the same sentence in all other e-mails is deleted (step s10), and the file name of the remaining text file 24a # (the received e-mail is stored in the spool area. The file name is automatically given, and the header file of the mail is given a header file name of the mail, for example, "Qbxxxxxxald @", and the body file is given the file name of the body data "dbxxxxxxald @". "Bxxxxxxaald" after the second character is a common character string. That.) To load the CPU14a (step s11).
[0041]
Subsequently, as shown in FIG. 10, under the control of the CPU 14a, the CPU 14a deletes one leading "d" character indicating a text file from the file name of the text data (for example, "dbxxxxxxald @") (step S12). s12) With respect to the header file 24b # of each e-mail in the same sentence area 27 in which one body file 24a # remains, a new file name "bxxxxxxaald" in which the leading "d" is deleted and the header file name of the e-mail The header file 24b # of all the other mails is deleted except the header file of the matching file name "Qbxxxxxxald @" from the second character (step s13). As a result, in the same sentence area 27, only one header file 24b # having the file name "Qbxxxxxxald #" and one body file 24a # having the file name "dbxxxxxxalald #" remain.
[0042]
Subsequently, as shown in FIG. 11, under the control of the CPU 14a, all the recipient mail addresses described in the header file 24b # of the remaining e-mail are deleted (step s14), and the same sentence area 27 being processed is deleted. The list of the sorted recipient mail addresses stored in the second memory 28 assigned to the header file 24b # is inserted and described in the empty header file 24b # where all the recipient mail addresses have been deleted in step s14. And save (step s15), and jump to step s6.
[0043]
In step s6, the writing of the recipient e-mail address of each e-mail for all the same sentence areas 27 is completed, so that the recipient e-mail addresses are grouped for the same destination domain in the work area 22. Is transmitted to each sender (“daiichi@isp.ne.”), Which is composed of one header file 24b # in which the header file 24b # is described and one body file 24a # paired with the header file 24b #. jp @ "," daini {company.com} "). Then, in step s16 following this, as shown in FIG. 12, it is determined whether or not the transfer e-mail data 29 exists in the work area 22, and if not, the e-mail transfer program ends.
[0044]
In step s16, if there is unprocessed transfer e-mail data 29, one set of unprocessed transfer e-mail data 29 is taken out of the work area 22 and stored in the first memory 25 under the control of the CPU 14a. (Step s17), the recipient mail addresses summarized for each same destination domain of the header file 24b # are written out to the second memory 28 corresponding to the body file 24a # of the electronic mail data 29, and the destination domain name in the header file 24b # is written. The number of different domains and the head position at which the domain name changes are checked by the recipient mail address stored in the second memory 28, and the third memory 30 corresponding to the second memory 28 provided in the main storage unit 14b # is provided. The number of the domain name and the head position are stored (step s 8). According to the step s18, according to the example, in the second memory 28, "aaa@a.com$", "ccc@a.com$", "fgt@a.com$", "ert@a.com$", " zes {a.com}, "bbb {b.ne.jp}", "asd {b.ne.jp}", "wqa {b.ne.jp}", "ddd@c.com}," xcv @ c. com @ "and" opl @ c.com @ "are stored in this order, so the different destination domain names are" a.com @ "," b.ne.jp @ "and" c.com @ ", and the different domain names The first position where the domain name changes is the first line of the domain name "a.com @", the sixth line of the domain name "b.ne.jp $", and the ninth line of the domain name "c.com $". What .
[0045]
Subsequently, it is determined whether or not the number of domain names stored in the third memory 30 is one (step s19). If the number of domain names is not one, the transfer program storage unit 20 is controlled by the CPU 14a. The stored active e-mail transfer program is copied to the copy program storage unit 21 by one less than the number of the domain names (step s20). Thereafter, the running e-mail transfer program itself continues to process the destination domain at the first head position stored in the third memory 30, and the copied e-mail copied to the copy program storage unit 21. The transfer program simultaneously executes processing for each of the destination domains at the second and subsequent top positions.
[0046]
That is, in the active e-mail transfer program stored in the transfer program storage unit 20, for example, a recipient mail address addressed to the domain name “a.com @” in the first line stored in the third memory 30 Transfer processing is executed for “aaa@a.comｃｏ”, “ccc ＠ a.com”, “fgt ＠ a.com”, “ert ＠ a.com”, and “zes ＠ a.com”, and a copy program storage unit. The first copy electronic mail transfer program copied to the recipient 21 is a recipient mail address “bbb @ b” addressed to the domain name “b.ne.jp @” in the second line stored in the third memory 30. .Ne.jp}, "asd {b.ne.jp}", and "wqa {b.ne.jp}", and executes the copy program. The second copy electronic mail transfer program copied to the section 21 is a recipient mail address “dddd@c.d” addressed to the domain name “c.com @” on the third line stored in the third memory 30. com @ "," xcv @ c.com @ ", and" opl @ c.com @ ".
[0047]
Even when the electronic mail transfer program itself is copied to the copy program storage unit 21, the electronic mail transfer program itself and each copy electronic mail transfer program operate independently, so that the electronic mail transfer program is determined by the determination in step s19. Is the same as the operation of the electronic mail transfer program itself in the case where is not copied, so that the processing procedure of one electronic mail transfer program will be described in the following description.
[0048]
First, as shown in FIG. 13, the recipient mail address (for example, "aaa@a.com$") at the head position corresponding to the electronic mail transfer program in the third memory 30 is extracted from the header file 24b #, and According to the destination domain (“a.com @”) of the mail address, a request for name resolution is made to the DNS @ server closest to the net via the Internet network 1 to check the IP address, and the mail server using this IP address is checked (step). s21). Next, it is determined whether the mail server of the destination domain has been specified (step s22). If the mail server cannot be specified, the recipient mail address (“a.com @”) of the destination domain (“a.com @”) whose mail server could not be specified is determined. "Aaa @ a.com @", "ccc@a.com$", "fgt@a.com$", "ert@a.com$", "zes@a.com$"), so that the CPU 14a With this control, one e-mail describing the recipient e-mail address and "cannot be sent" is created and transmitted to the sender e-mail address ("daiichi {isp.ne.jp}") (step s23). Thus, the recipient mail of the destination domain (“a.com @”) that could not be processed stored in the second memory 28 Dress ("aaa @ a.com @", "ccc @ a.com @", "fgt @ a.com @", "ert @ a.com @", "zes @ a.com @") and the corresponding address in the header file 24b # Recipient email addresses of the destination domain (“aaa @ a.com @”, “ccc@a.com”, “fgt@a.com”, “ert@a.com”, “zes@a.com”) It is deleted (step s24), and it is determined whether or not the operating e-mail transfer program is a copy e-mail transfer program generated by copying (step s25). The copy e-mail transfer program is stopped and erased from the copy program storage unit 21 (step s26). To terminate the management.
[0049]
In step s22, if the mail server can be specified, as shown in FIG. 14, the destination domain is connected from the remote port (for example, port 23) of the transfer server (transmission side mail server) 2a without passing through the transfer channel of the relay server. Remote connection to establish a direct connection to the receiving side mail server (first receiving side mail server 7) (for example, "telnet @ <IP address of destination domain> {TCP: 25}") (step s27), If the connection has not been made (step s28), it is determined whether or not the connection has been tried a predetermined number of times (step s29). If the connection has not been made after the predetermined number of times, the destination is controlled by the CPU 14a. Recipient mail address (“a”) addressed to the mail server (first receiving side mail server 7) of the domain. a ＠ a.com, ccc ＠ a.com, “fgt ＠ a.com”, “ert ＠ a.comｚ”, “zes ＠ a.com”) and the text file of the same sentence Is returned to the spool area 19, and the recipient mail address of the destination domain stored in the second memory 28 and the recipient mail address of the destination domain in the header file 24b # are prevented from being duplicated. (Step s30), and similarly to steps s25 and s26, whether the operating e-mail transfer program is a copy e-mail transfer program generated by copying is determined. Judgment (step s31), if the copy electronic mail transfer program, the copy electronic mail Stop feeding program was deleted from the copy program storage unit 21 is terminated (step s32) process. If the predetermined number of times has not been performed in step s29, the process jumps to step s27.
[0050]
In the step s28, a direct connection can be established between the remote port (23rd port) of the transfer server 2a # and the remote port (23rd port) of the first receiving mail server 7 (receiving mail server). In this case, since the port 25 is specified as an argument at the time of remote connection, the data is passed to the SMTP at the first receiving side mail server 7 and the port 25 becomes the window and the remote port of the transfer server 2a @ Transmission / reception starts between port 23) and port 25 of the first receiving mail server 7, and as shown in FIG. 15, the transfer server 2a # transmits the sending domain to the first receiving mail server 7. A "HELO" command is transmitted as an argument (step s33), and the OK information of the response code "250 @" is sent from the first receiving side mail server 7. (Step s34), the transfer server 2a # transmits the message to the first receiving side mail server 7 with the sender's mail address ("daiichi@isp.ne.jp}" added as an argument to the "MAILFROM #" command. (Step s35) As shown in FIG. 16, after receiving the OK information of the response code “250 °” from the first receiving side mail server 7 (Step s36), the first receiving side mail server is stored in the second memory 28. It is determined whether or not there is a recipient e-mail address to be taken out with the destination domain set to 7 (step s37). If there is an unprocessed recipient e-mail address, the recipient e-mail address stored in the second memory 28 E-mail addresses for the destination domain of the first receiving mail server 7 in the list are sequentially extracted one by one from the top. Then, using the extracted recipient mail address (“aaa@a.com}) as an argument, transmits a“ RCPT @ TO} command (“RCPT @ TO: {aaa@a.com}”) to the first receiving side mail server 7. (Step s38).
[0051]
Subsequently, as shown in FIG. 17, there is a recipient mail address (“aaa@a.com$”) whose response code is received as an argument in the “RCPT {TO}” command from the first reception side mail server 7, and It is determined whether it is OK information of “250 °” that can be delivered to the box (steps s39 and s40). If the OK information can be delivered, the process jumps to step s37, and if it is error information that it cannot be delivered. For example, under the control of the CPU 14a, as shown in FIG. 18, in preparation for notifying the sender that the recipient mail address (“aaa {a. One of the unsendable mails 31 to be transmitted is created and stored in the fourth memory 32 of the main storage unit 14b #. If the unsendable mail 31 has already been stored in the fourth memory 32, an unsendable recipient email address (“aaa@a.com}) is added. Then, the unreceivable recipient e-mail address (“aaa {a.com}”) is deleted from the recipient e-mail address list in the second memory 28, and the header file 24b of the transfer e-mail 29 currently being transmitted is processed. Deletes the unreceivable recipient mail address ("aaa@a.com$") from (step s41) and jumps to step s37.
[0052]
In step s37, if there is no recipient e-mail address to be taken out, that is, if it is determined whether or not transfer is possible for all recipient e-mail addresses having the first recipient mail server 7 as the destination domain, As shown in FIG. 19, a "DATA" command is transmitted from the transfer server 2a # to the first receiving side mail server 7 (step s42). Upon receiving the “DATA” command, the first receiving mail server 7 transmits a response code “354 {Start} mail input: {end with} <CRLF>. <CRLF>} to start inputting the text of the mail, and waits for input of the text of the mail. After receiving the response code, the transfer server 2a # takes out the body data from the combined body file 24a # and sends the body of the mail. When the body text transmission is completed, ". (Period) Is transmitted (step s43). When the first receiving mail server 7 receives the “•” command, the e-mail of the text is delivered to the mailbox of the recipient mail address that can be delivered, and the transfer server 2a # is sent from the first receiving mail server 7 After receiving the distribution end notification (step s44), a "QUIT" command for notifying the transmission end is transmitted (step s45), and the destination domain ("a .Com @)) ("aaa @ a.com @", "ccc@a.com$", "fgt@a.com$", "ert@a.com$", "zes@a.com$") And the recipient mail address (“aaa@a.com”, “ccc@a.co”) of the destination domain in the header file 24b #. , "Fgt@a.com$", "ert@a.com$", "zes@a.com$") (step s46), and the operating e-mail transfer program is generated by copying. It is determined whether or not the program is a copy electronic mail transfer program (step s47). If it is a copy electronic mail transfer program, the copy electronic mail transfer program is stopped and deleted from the copy program storage unit 21 (step s48). The process ends.
[0053]
In step s47, if it is the electronic mail transfer program itself, as shown in FIG. 21, it is determined whether there is an unsendable mail 31 (step s49), and the unsendable mail 31 is stored in the fourth memory 32. If so, the created unsendable mail 31 is sent to the sender's (first trader's) email address ("daiichi@isp.ne.jp}") (step s50). If the mail 31 does not exist, the process jumps to step s16 in order to determine whether or not the transfer e-mail data 29 exists in the work area 22 as in the case of the copy electronic mail transfer program in steps s25 and s31.
[0054]
In step s50, if the sender's e-mail address cannot be specified, it is stored for a desired period.
[0055]
In the e-mail transfer method according to the present embodiment, transfer server 2a # copies a plurality of e-mails (e-mail data) 23 waiting for transmission stored in spool area 19 to work area 22, and the copied data is transferred to work area 22. The recipient e-mail addresses of the plurality of copy e-mails (copy e-mail data) 24 waiting for transmission are extracted from the header file of the copy e-mail 24 and stored in the second memory 28 of the main storage unit 14b #. After the same destination domain is combined in the memory 28, the destination "destination" is not transmitted via the transfer channel of the relay server by the command "telnet {<IP address of destination domain> {TCP: 25}" from the remote port of the transfer server 2a #. Directly connect to the mail server of the domain in remote mode, and E-mail is sent directly to the mail server of the destination domain only by determining whether the mailbox of the mail address exists in the mail server of the destination domain. Since a direct connection is established between the remote port (the 23rd port) of the transfer server 2a # and the remote port (the 23rd port) of the mail server of the destination domain, the 25th transfer server 2a # Since a connection is not established between the port and the 25th port of the mail server, it is possible to easily connect to the mail server even when the SMTP load of the mail server is high, and the connection is established. Later, the data is passed to the SMTP of the mail server of the destination domain, and the transfer server 2a @ Since it is not the 25th port, the SMTP of the mail server is not affected by the SMTP of the transfer server 2a #, the connection can be maintained without burdening the mail server, and the same destination domain is used. Since only the e-mails received by the mail server are transmitted after being compiled for each case, the connection processing can be reduced even when transmitting a large amount of e-mails, and the network load can be reduced.
[0056]
The e-mail data 24 waiting for transmission of the copy stored in the work area 22 is classified for each e-mail having the same body data, and the recipient e-mail addresses in each e-mail are grouped for the same destination domain. Since the transfer e-mail 29 is composed of one body file 24a # and one header file 24b # having a plurality of recipient e-mail addresses, one or several large amounts of broadcast e-mails having the same sentence are created. , The connection processing can be further reduced, and the network load can be reduced.
[0057]
In addition, since the plurality of e-mails 24 waiting to be transmitted via the Internet are first classified for each sender, a non-sendable e-mail 31 having a recipient e-mail address having no mailbox as the body information can be created. The unsendable mail 31 is created for each sender's e-mail address. Even if there are many e-mails to the unsendable recipient's e-mail address, one unsendable mail 31 can be sent to the sender's e-mail address. Therefore, when a large amount of unsendable e-mail is transmitted, the number of connection processes can be reduced, and the network load can be reduced.
[0058]
In addition, one transfer e-mail 29 having one body file 24a # and one header file 24b # which collects the recipient e-mail addresses of the e-mails 24 for the same destination domain is created, and the destination domain is created. It is determined whether or not the body information of the body file 24a # can be delivered to the mailbox of the receiver mail address in the mail server of the mail server, and the body of the transfer e-mail 29 only for the receiver mail address that can be delivered. Because the information is sent directly, the email is reliably delivered to the mailbox.
[0059]
Further, in the e-mail transfer program according to the present embodiment, a plurality of e-mails 23 which are received by the receiving side SMTP of the mail server 2 via the Internet network 1 and stored in the spool area 19 and which are waiting for transmission are transferred. A step of copying to the work area 22 of the server 2a # (step s1); and a plurality of e-mails 24 waiting for transmission copied to the work area 22 are classified by the same sender and stored in each sender area 26 of the work area 22. (Step s2) and the step of storing the e-mails 24 classified for each identical sender for each identical body of the same body information in the same sentence area 27 of each sender area 26 (step s5). Recipient mail addresses of the e-mails 24 classified for each body text are obtained from the header file 24b # of each e-mail 24. (Steps s8 and s9) to output the information and store it in the second memory 28 of the main storage unit 14b # corresponding to the same sentence area 27, and rearrange the recipient mail addresses in the second memory 28 for each same destination domain. One transfer file including a header file 24b # composed of recipient mail addresses sorted in the second memory 28 and grouped for the same destination domain, and a text file 24a # composed of the same text information. In the step of creating the mail 29 (steps s10 to s15), if there are two or more destination domain names in the recipient mail address of the header file 24b # of the transfer e-mail 29, the transfer program storage unit 20 The stored e-mail transfer program itself is deducted from the number of the destination domain names by one. A step (steps s19, s20) of copying a small number to the copy program storage unit 21, and the transfer server 2a # by the electronic mail transfer program itself transfers the copied electronic mail transfer program to the mail server of one destination domain. Transfer server 2a # to the remote port (23) of each transfer server 2a # with respect to the mail server of the other different destination domain except the destination domain of the mail server connected by the transfer server 2a # by the electronic mail transfer program itself. Port) without directly passing through the transfer channel of the relay server to the mail server of the destination domain directly to determine whether the mailbox of each recipient mail address exists in the mail server of the destination domain, Mailbox exists (Steps s27, s28, s33 to s40) to determine whether or not distribution is possible, and only for recipient e-mail addresses that can be transmitted subsequently Directly transmitting the body information of the transfer e-mail 29 to the mail server of the destination domain (steps s42 to s44); and for the recipient e-mail address that cannot be transmitted due to the absence of a mailbox, etc. Transmitting one e-mail (unsendable e-mail) 31 created for each sender e-mail address having the address as the body information to the sender e-mail address (step s50). Since 2a @ operates, e-mails to be forwarded are grouped for the same destination domain Directly connects to the receiving mail server of the destination domain, and in a state where the connection is established, it is determined whether or not each electronic mail can be delivered by the receiving mail server of the destination domain. Since only the e-mail received by the mail server is transmitted, the connection processing can be reduced even when transmitting a large amount of e-mail, and the network load can be reduced. In addition, since the e-mail that cannot be sent is created as one e-mail with the recipient e-mail address as the body information and sent to the sender e-mail address, the number of sender e-mails equal to the number of e-mails that could not be forwarded was sent. It is possible to avoid the situation where the address reaches the address, and reduce the load factor of the electronic path band.
[0060]
Further, after directly establishing a connection between the remote port of the sending mail server and the remote port of the receiving mail server without passing through the transfer channel of the relay server, the data is transferred to SMTP in the receiving mail server. Since there is no connection between port 25 of the sending mail server and port 25 of the receiving mail server, it is easy for the receiving side even if port 25 of the receiving mail server is under a heavy load. By connecting to the mail server and passing the data from the remote port of the receiving mail server to the SMTP of port 25, the receiving mail server becomes port 25 as a result, and the sending mail server becomes port 25. Because it is not a port, the SMTP of the receiving mail server is Not be affected from P, it is possible to hold the connection without placing a burden on the reception side mail server.
[0061]
In addition, since the remote port (23rd port) of the transfer server 2a # is directly remotely connected to the mail server of the destination domain without passing through the transfer channel of the relay server, the SMTP in the mail server of the destination domain is overloaded. Even when the load is applied, the mail server of the destination domain monitors the connection itself, performs the transmission / reception processing of the e-mail, and notifies the transfer server 2a # that the e-mail cannot be delivered. In this case, since the programs to be executed are different from each other, the load is substantially distributed, so that transmission / reception of the e-mail is not interrupted.
[0062]
Also, if there are a plurality of e-mails grouped by the same destination domain due to the difference in the body information, the remaining number of e-mails will be sent without disconnecting the mail server of the destination domain. Mail can be processed, so depending on the network traffic status when connecting again and the load status of the mail server in the destination domain, it is necessary to take time to connect or avoid the case where it can not be connected be able to.
[0063]
Further, the e-mail transfer server 2a # according to the present embodiment is provided with a transfer program storage unit 20 storing the e-mail transfer program and a control determining device 14 for executing the e-mail transfer program. The transfer server 2a transfers an e-mail according to the e-mail transfer method and operates according to the e-mail transfer program. Therefore, even if the SMTP of the receiving mail server is in a high load state, the transfer server 2a # can easily transmit the e-mail. Can be connected, the connection can be maintained without imposing a load on the mail server, and the network load can be reduced.
[0064]
Further, in the present embodiment, the mail server 2 serves as a receiving-side SMTP that receives an e-mail from another sending-side mail server and an e-mail sent from a sender within its jurisdiction and stores the e-mail in the spool area 19. The active SMTP receiving server 2b # and the transfer server 2a # for transferring the e-mail waiting for transmission operate independently, and the mail server on the receiving side for the transfer server 2a # is communicated by the existing receiving-side SMTP. The mail server on the receiving side does not need to mount a new mail server for transmission / reception to / from the transfer server 2a #, so that it can be easily constructed on the current network.
[0065]
Embodiment 2 FIG.
[0066]
The present embodiment is a broadcast mail in which the e-mail 24 waiting for transmission stored in the work area 22 according to the first embodiment has a text that differs only in a common text position of each body information. This is an electronic mail transfer method for transferring the broadcast mail, and will be described with reference to FIGS.
[0067]
In the e-mail transfer method according to the present embodiment, after it is determined in the e-mail transfer programs shown in FIGS. 6 to 21 that sorting for each e-mail having the same body data has been completed (step s4). The e-mails 24 having the same text data are grouped for each of the same text information, and there is no unclassified e-mail 24 in the sender area 26, and what remains in the sender area 26 is text data having different text information. In the case of the e-mail 24, the respective e-mail data 24 is sequentially taken out again to the first memory 25 of the main storage unit 14b #, and the text data of the e-mail 24 differs only in the text position where the text information is common. It is determined whether or not the e-mail 24 has a different text only in the common text position. After classifying by chapter position and storing the same in the same sentence area 27 in a similar manner, the e-mail data 24 stored in each of the same sentence areas 27 is sequentially taken out to the first memory 25 and the e-mail data 24 The text at the common text position in the body data is replaced with the same substitute character (for example,　!　)) And store the same text information in the same sentence area 27, and jump to step s6 to determine whether or not the recipient mail address of each e-mail has been written for all the same sentence areas 27. It has become.
[0068]
In the present embodiment, when the plurality of e-mails 24 waiting to be transmitted are broadcast mails in which only the common sentence position of each text information is different, the sentence at the common sentence position is the same. Since a plurality of e-mails 24 waiting to be sent with the same body information replaced with substitute characters, a name such as "XX" for each customer is inserted at a common sentence position in the body of the broadcast e-mail. Even if it is done, replace the name with the name such as "　!　, Etc., can be replaced, the result is an e-mail with the same body information, which can be combined as a single transfer e-mail 29.
[0069]
When the electronic mail having the same body information as the substitute character is transferred to the mail server of the destination domain, the transfer server 2a # replaces the mail with the substitute character for the mail server of the destination domain. The original text data list may be separately transmitted to prompt the mail server to replace the text information of the e-mail with the original text. In addition, the substitute character may be a character string, but is replaced in the text, so that a special symbol ("　!　)), May be a variable.
[0070]
Embodiment 3 FIG.
[0071]
In the present embodiment, the e-mail transfer program shown in FIGS. 6 to 21 is installed in the second PC 6 owned by the second trader in the first embodiment, the e-mail transfer program is started, and the second PC 6 is transferred. This is an e-mail transfer method that operates as the server 2a #. In the present embodiment, the processing of steps s2 and s3 for classifying each sender of the e-mail transfer program in the first embodiment is omitted. 1 operates in the same manner as the first embodiment, so that the same operation and effect can be obtained.
[0072]
【The invention's effect】
According to the present invention, even if the receiving mail server is in a high load state, it is possible to connect without burdening the receiving mail server, to maintain the connection, and furthermore, to cope with a large amount of electronic mail. It is possible to provide an e-mail transfer method and an e-mail transfer program capable of reducing a network load by reducing connection processing even when transmitting an e-mail, and an e-mail transfer server operated by the e-mail transfer program.
[0073]
Therefore, it can be said that the industrial applicability of the present invention is very high.
[Brief description of the drawings]
FIG. 1 is a block diagram of a computer network including a telephone according to an embodiment of the present invention.
FIG. 2 is a block diagram of the mail server shown in FIG. 1;
FIG. 3 is a block diagram of an auxiliary storage unit shown in FIG. 2;
FIG. 4 is a configuration block diagram when the mail server shown in FIG. 1 operates as a sending / receiving SMTP.
FIG. 5 is a block diagram of a main storage unit shown in FIG. 2;
FIG. 6 is a flowchart illustrating an electronic mail transfer program.
FIG. 7 is a flowchart illustrating an e-mail transfer program.
FIG. 8 is a flowchart illustrating an e-mail transfer program.
FIG. 9 is a flowchart illustrating an electronic mail transfer program.
FIG. 10 is a flowchart illustrating an electronic mail transfer program.
FIG. 11 is a flowchart illustrating an e-mail transfer program.
FIG. 12 is a flowchart illustrating an e-mail transfer program.
FIG. 13 is a flowchart illustrating an electronic mail transfer program.
FIG. 14 is a flowchart illustrating an electronic mail transfer program.
FIG. 15 is a flowchart illustrating an electronic mail transfer program.
FIG. 16 is a flowchart illustrating an electronic mail transfer program.
FIG. 17 is a flowchart illustrating an electronic mail transfer program.
FIG. 18 is a flowchart illustrating an electronic mail transfer program.
FIG. 19 is a flowchart illustrating an electronic mail transfer program.
FIG. 20 is a flowchart illustrating an e-mail transfer program.
FIG. 21 is a flowchart illustrating an electronic mail transfer program.
[Explanation of symbols]
1 Internet network
2 Mail server
2a @ Transfer server
3 First PC
4 ISP server
6 @ 2nd PC
7. First recipient mail server
8 Gateway
10 @ Second recipient mail server
12 Telephone network
14 control judgment device
14a @ CPU
14b Main storage unit
15 Auxiliary storage device
18 SMTP program storage
19 Spool area
20 Transfer program storage
21 Copy program storage
22 Work area
23 @ E-mail data (E-mail)
24 @ copy e-mail data (copy e-mail)
24a Body file
24b @ header file
25 First memory
26 Sender area
27 Same sentence area
28 second memory
29 E-mail data for transfer (e-mail for transfer)
30 Third memory
31 @ Unsendable mail
32 @ 4th memory

Claims (16)

After the transfer server collects the recipient mail addresses of the plurality of e-mails waiting to be transmitted for the same destination domain, the mail of the destination domain is transmitted from the remote port of the transfer server without passing through the transfer channel of the relay server. Directly connect to the server, determine whether the mailbox of each of the grouped recipient mail addresses exists in the mail server of the destination domain, and then check the recipient mail address where the mailbox exists. An e-mail transfer method, wherein the e-mail is directly transmitted to a mail server of the destination domain. After the transfer server collects the recipient mail addresses of the plurality of waiting e-mails having the same body information for each of the same destination domains, the transfer server transmits the e-mail to the remote port of the transfer server without passing through the transfer channel of the relay server. Directly connect to the mail server of the destination domain, determine whether the mailbox of each of the grouped recipient mail addresses exists on the mail server of the destination domain, and then determine the recipient whose mailbox exists. An electronic mail transfer method, wherein an electronic mail is directly transmitted to a mail server of the destination domain only to a mail address. After the transfer server collects the recipient mail addresses of the plurality of e-mails waiting to be transmitted received via the Internet for each of the same destination domains, the transfer server does not pass from the remote port of the transfer server via the transfer channel of the relay server. Directly connect to the mail server of the destination domain, determine whether or not the mailbox of each of the grouped recipient mail addresses exists in the mail server of the destination domain, and then receive the mail in which the mailbox exists. Sends an e-mail directly to the mail server of the destination domain only to the person's mail address, and sends a single e-mail with the recipient's mail address as the body information for the recipient's mail address where there is no mailbox. The address is created for each address and sent to the sender's email address. E-mail transfer method. The transfer server collects, for each of the same destination domains, recipient e-mail addresses of a plurality of e-mails waiting to be transmitted and having the same body information received via the Internet, from the remote port of the transfer server to the relay server. And directly connecting to the mail server of the destination domain without passing through the transfer channel of the destination domain to determine whether or not the mailbox of each of the grouped recipient mail addresses exists in the mail server of the destination domain. Then, an e-mail is sent directly to the mail server of the destination domain only for the recipient mail address where the mailbox exists, and for the recipient mail address where the mailbox does not exist, the recipient mail address is used as the body information. One e-mail to be created for each sender e-mail address E-mail transfer method and transmitting. The transfer server collects, for each of the same destination domains, one text file including the text information of a plurality of e-mails waiting to be transmitted and having the same text information, and a recipient mail address of each of the e-mails. A single transfer e-mail having one header file and directly connecting to the mail server of the destination domain from the remote port of the transfer server without passing through the transfer channel of the relay server, and setting the recipient e-mail address E-mail forwarding wherein the body information of the transfer e-mail is directly transmitted only to a recipient mail address that can be delivered by determining whether or not the body information can be delivered to a mailbox. Method. A plurality of e-mails waiting to be transmitted are broadcast mails in which only the common text position of each text information is different from each other, and the text at the common text position is replaced with the same substitute character to obtain the same text information. The electronic mail transfer method according to claim 4 or 5, wherein the plurality of electronic mails are waiting for transmission. Causing the transfer server to group recipient e-mail addresses of the plurality of e-mails waiting to be transmitted for each same destination domain; and allowing the transfer server to bypass the transfer channel of the relay server from the remote port of the transfer server. Connecting directly to the mail server of the destination domain; and causing the transfer server to determine whether or not the connected mail server of the destination domain has a mailbox for each of the grouped recipient mail addresses. And a step of causing the transfer server to directly send an e-mail only to a recipient mail address where a mailbox exists, to a mail server of the destination domain. Causing the transfer server to group recipient mail addresses of a plurality of waiting e-mails having the same body information for each of the same destination domains; and causing the transfer server to transfer the relay server from the remote port of the transfer server. Connecting directly to the mail server of the destination domain without passing through a channel; and determining whether the transfer server has a mailbox of each of the grouped recipient mail addresses in the connected mail server of the destination domain. And causing the transfer server to directly send an e-mail only to the recipient mail address where the mailbox exists, to the mail server of the destination domain. Mail transfer program. Causing the transfer server to group recipient mail addresses of a plurality of e-mails waiting to be transmitted received via the Internet for each of the same destination domains; and Connecting directly to a mail server of the destination domain without passing through a transfer channel, and determining whether the transfer server has a mailbox of each of the combined recipient mail addresses in the connected mail server of the destination domain. Determining whether or not the transfer server directly transmits an e-mail to the mail server of the destination domain only to the recipient mail address where the mailbox exists; and Recipient email addresses that are not The create a single e-mail to text information for each sender email address e-mail transfer program characterized by comprising a step of transmitting to the sender mail address. Causing the transfer server to combine recipient e-mail addresses of a plurality of e-mails waiting to be transmitted, which have the same body information received via the Internet, for each of the same destination domains; and Connecting directly from the remote port of the server to the mail server of the destination domain without passing through the transfer channel of the relay server; Determining whether a mailbox of the address exists; and causing the transfer server to directly send an e-mail only to the recipient mail address where the mailbox exists, to the mail server of the destination domain. If the forwarding server has a recipient email address that does not have a mailbox, E-mail transfer program, characterized in that to create a single e-mail to the payee mail address and text information for each sender email address comprising a step of transmitting to the sender mail address. 11. The e-mail transfer program according to claim 7, wherein, when the e-mail addresses of the e-mails waiting for transmission are grouped for the same destination domain, two or more destination domain names are set. Exists, the e-mail transfer program itself is copied by one less than the number of the destination domain names, and the destination domain of the mail server connected by the transfer server by the e-mail transfer program itself is changed. An e-mail transfer program, characterized in that the mail servers of the remaining different destination domains except the connection are connected by a transfer server by means of a copied copy e-mail transfer program. In the transfer server, one text file composed of the text information of a plurality of e-mails waiting to be transmitted and having the same text information and a recipient mail address of each of the e-mails are collected for each same destination domain. Generating a single transfer e-mail having two header files, and causing the transfer server to directly connect to the mail server of the destination domain from the remote port of the transfer server without passing through the transfer channel of the relay server And causing the transfer server to determine whether the body information can be delivered to the mailbox of the recipient mail address. Directly transmitting the body information of the mail. Program. A plurality of e-mails waiting to be transmitted are broadcast mails in which only the common text position of each text information is different from each other, and the text at the common text position is replaced with the same substitute character to obtain the same text information. 13. The electronic mail transfer program according to claim 10, wherein the plurality of electronic mails are waiting for transmission. A step of the transfer server classifying a plurality of e-mails waiting for transmission for each same sender; a step of the transfer server classifying a plurality of e-mails classified for each same sender for each same body of the same body information; The server extracts a recipient mail address in the e-mail classified by the same body from the header file of each of the e-mails and collects the same for each of the same destination domains, and a body file of the same body information. Creating a single transfer e-mail, the transfer server connecting directly to the mail server of the destination domain from the remote port of the transfer server without passing through the transfer channel of the relay server, Determine whether the mailbox of the address exists on the mail server of the destination domain Step: the transfer server directly transmitting the body information of the transfer e-mail to the mail server of the destination domain only to the recipient mail address where the mailbox exists, and the transfer server does not have the mailbox Creating an e-mail with the recipient e-mail address as the body information for each sender e-mail address and transmitting the e-mail to the sender e-mail address. program. The e-mail transfer program according to claim 12 or claim 14, wherein after creating the e-mail for transfer, two or more destination domain names are included in the recipient e-mail address of the header file of the e-mail for transfer. If there is, the e-mail transfer program itself is copied by one less than the number of the destination domain names, and the destination domain of the mail server connected by the transfer server by the e-mail transfer program itself is excluded. The remaining mail servers of different destination domains are connected by the transfer server by the copied copy e-mail transfer program. 16. An e-mail transfer server, comprising storage means for storing the e-mail transfer program according to claim 7, wherein the e-mail transfer server is operated by the e-mail transfer program.

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