JPH10308767A - Mail transmission system, mail transmission method, and recording medium - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To transmit an electronic mail of the same sentence to a large number of destinations in a short time. A transmission side has a network address (I).
A first mail server 24 that collectively sends an e-mail to a destination belonging to a domain whose P-address is known to the domain, and a destination belonging to a domain whose network address is unknown on the transmission side. A second mail server 25 for searching the network address of the domain for the e-mail to the e-mail, and then transmitting the e-mail to the network, the first mail server and the second mail server 24 and the second mail server 2
5 are performed as mutually independent processes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mail transmission system and method for transmitting an electronic mail via a network, and more particularly to a mail transmission system for transmitting an electronic mail having the same text content to a large number of destinations. And methods.

[0002]

2. Description of the Related Art In recent years, with the development of network technology,
Sending and receiving e-mail via a network has become popular. E-mail has been widely exchanged not only in a closed network environment within one department or one company but also via the Internet.

[0003] When an electronic mail is transmitted, the mail address of the transmission destination is required in the same way as the address and the address of the transmission destination are required by ordinary mail. In an electronic mail on the Internet, the mail address is included in the header part. The mail address is represented, for example, as "aaa@bbb.co.jp" or "aaa@bbb.ccc.ac.jp". The left side of the at sign "@" represents the user name, and the right side is the domain name. However, in the Internet, TCP / IP (Transmission Control P
Since the Internet protocol (rotocol / Internet Protocol) is used as a communication control procedure, an IP address of a destination domain is required to actually deliver an electronic mail on the Internet. The IP address is composed of a 4-bit binary bit string, and is uniquely assigned to all domains connected to the Internet all over the world. When sending an e-mail, the sending site uses the IP address of the domain to which the e-mail is sent from the e-mail address described in the e-mail header.
It is necessary to perform processing for obtaining an address.

[0004] When electronic mail is actually exchanged on the Internet, a mail server is required for each domain. In a large-scale domain, one machine (computer) is operated exclusively for a mail server. In a small-scale domain, mail server application software is installed on one of the machines in the domain to serve as a mail server. You can also. The mail server is eventually realized by software, and the machine on which the mail server software is installed becomes the mail server as an apparatus. UNIX as operating system (OS) (UNIX is X / Open
In the case of using the product name or a UNIX clone, the mail server software is executed as a process.

[0005] There is no single mechanism for centrally managing all the domains connected to the Internet, and the domains connected to the Internet are constantly changing. A mechanism for converting a domain name into an IP address throughout the Internet is a distributed database DN.
S (domain name server) is used. D
The NS is located at various places on the Internet or a LAN connected to the Internet. If the mail server of a certain sending site does not know the IP address of a certain domain name (accurately, the IP address to the mail server of the domain), that is, if it is unresolved, it means that it is close to the network. A certain DNS is inquired about an IP address for the domain name. If the queried DNS does not know the IP address corresponding to the domain name, the queried DNS goes to another DNS to query. In this way, the IP address corresponding to the domain name is sent from a DNS server somewhere on the Internet.
Know the address and send an e-mail using that IP address. The transmitted e-mail propagates in the Internet by the route control based on the IP address, and is delivered to the receiving site. And on the receiving site,
The e-mail is received by the mail server and stored in a storage area called a mailbox.

[0006] By the way, with the development of electronic mail, the number of transmissions of the same sentence to a large number of destinations has been increasing. There has been a mailing list in this form for a long time, but recently, for example, with a membership-based news service, etc., an e-mail is sent to ten thousand units of members at the specified date and time for news and guidance to various events. Delivery is being done. When a large number of e-mails with the same sentence are sent in this way, an IP address is obtained (solved) from the domain name for each destination.
Like that.

FIG. 6 shows, for example, aa1@aaa.co.jp, aa2 @ aa
This shows the flow of a conventional process when sending an e-mail with the same sentence to each mail address of a.co.jp, ..., bbb@bbb.co.jp, .... The mail address of the transmission destination is given as a list 91. When the specified transmission date and time arrives, first, read the address aa1@aaa.co.jp and put it together with the text to be sent (mail reading), and query the DNS for the IP address for the domain aaa.co.jp (search for the destination address) ). Then, an e-mail is transmitted by the inquired IP address. At this time, the mail 92
The IP address of the destination domain (for example, “111.111.111.
111 ") and the destination mail address are added as a header to the body and transmitted. Next, address aa2@aaa.c
Perform processing for o.jp. In this case, the domain name is the same as the mail already sent to the address aa1@aaa.co.jp, and the sending site has an IP address for this domain.
Since the address (“111.111.111.111”) is already known, the address search is completed inside the transmitting site, and the mail 92 is transmitted. Hereinafter, in the same manner,
Address from a different domain, eg address bbb@bbb.c
Perform processing for o.jp. At this time, the domain bbb.co.j
Since the IP address for p is unknown to the mail server at the sending site, an inquiry to DNS is made again. In the example shown, the domain bbb.co.jp
Is "123.111.111.111". In this way, the e-mail is sequentially transmitted to each destination, and a series of transmission processing is completed.

[0008]

However, in the above-described conventional transmission procedure, when an electronic mail of the same sentence is transmitted to a large number of destinations, a search for an IP address from a domain name included in the mail address is performed for each destination. Since it is executed every time, there is a problem that it takes time to finish sending all of a series of e-mails. In particular, inquiries from the mail server to other DNSs cannot be accurately evaluated due to the nature of the Internet, and may sometimes be greatly delayed or failed.
For this reason, in some cases, it may take one day or more to finish sending all of the series of e-mails.

[0009] If such a long time is required, an unfairness occurs between a person who transmitted the first part of the series of e-mails and a person who transmitted the last part thereof. If there is any e-mail that failed to be sent for any reason, processing such as resending will be executed, so e-mails sent after that e-mail should be sent after the time when transmission was originally possible become.

An object of the present invention is to provide a mail transmission system and a mail transmission method capable of completing transmission of an electronic mail of the same sentence to a large number of destinations in a short time, and a recording medium thereof.

[0011]

According to a first mail transmission system of the present invention, a route is controlled by a network address, and a network to which data is transferred by designating a network address of a domain on a receiving side is provided. In a mail transmission system that sends an e-mail with the same text to a plurality of destinations, a domain in which the address of each destination includes the name of the domain to which the destination belongs, and the network address is known in the mail transmission system A first transmitting means for collectively transmitting an e-mail to a destination belonging to the domain on a network, and an e-mail to a destination belonging to a domain whose network address is unknown in the mail transmission system. Search for the network address of the domain After, and a second transmission means for transmitting the e-mail on the network.

A second mail transmission system according to the present invention transmits an e-mail having the same text via a network to which data is transferred by specifying a network address of a domain which is a receiving side by performing route control by a network address. In a mail transmission system for sending to a plurality of destinations described in a list, the address of each destination includes the name of the domain to which the destination belongs, and the network address of the domain is searched from the domain name Based on the search method and the list, the destination addresses are grouped for each domain to which they belong,
Destination determination means for searching the network address of the domain to which the destinations listed in the list belong by the search means, and destination determination for e-mails to the destinations belonging to the domains whose network addresses have been checked by the destination determination means. A first transmitting unit that collectively transmits the e-mails for the destinations collected by the unit on the network, and an e-mail to the destination belonging to the domain whose network address was not found by the destination determining unit. And a second transmission unit for transmitting the e-mail to the network after the search unit searches for the network address of the corresponding domain.

In a first mail sending method according to the present invention, an e-mail of the same text is transmitted via a network to which data is transferred by specifying a network address of a domain on a route which is controlled by a network address and is a receiving side. In a mail transmission method in which a mail is transmitted from a sending site to a plurality of destinations, a domain in which the address of each destination includes a name of a domain to which the destination belongs, and a network address is known at the sending site. A first transmitting step of transmitting an e-mail to a destination belonging to the domain collectively on a network, and an e-mail to a destination belonging to a domain whose network address is unknown at the transmitting site. After searching for the network address for that domain, And a second transmission step of transmitting Lumpur on a network, a first transmission step and the second transmission process is executed independently.

According to a second mail transmission method of the present invention, an e-mail having the same text is transmitted via a network to which data is transferred by specifying a network address of a domain on a route which is controlled by a network address and is a receiving side. In the method of sending mail to a plurality of destinations listed in the list, the address of each destination includes the name of the domain to which the destination belongs, and based on the list, the address of the destination for each domain to which the destination belongs A destination determining step of searching the network address of the domain to which the destination described in the list belongs from the name of the domain, and an electronic mail to the destination belonging to the domain whose network address has been checked in the destination determining step. For e-mails, the addresses that were compiled by the destination confirmation process A first transmission step of transmitting all e-mails to the network in a batch, and an e-mail to a destination belonging to a domain whose network address was not found in the destination determination step, from the name of the domain to the network address. And transmitting the e-mail on the network. The first transmitting step and the second transmitting step are executed independently.

In the present invention, the network is typically the Internet. When the network is the Internet, the destination address is an e-mail address (for example, represented as “aaa@aaa.co.jp”), the network address is an IP address,
When retrieving the network address from a domain name, DNS is used.

In the present invention, collectively transmitting means that the text itself is transmitted only once, and instead, a plurality of destination addresses are collectively stored in a header attached to the text. . When such a receiving site receives such an electronic mail, it first reads the header and stores the electronic mail text in each of the mailboxes of the corresponding destination (plural).

According to the present invention, when sending an e-mail with the same text to a plurality of destinations by designating a date and time, that is, at the time of broadcasting, a list of addresses of the destinations is prepared in advance, and for example, When network traffic is relatively light, such as from the night before the transmission date to the dawn of the transmission day, the network address of the domain to which each destination belongs is checked by DNS or the like. Then, at the specified date and time, for a domain whose network address is known as a result of a preliminary check,
The first sending means sends the e-mails collectively by the already-examined network address without searching the network address again by an external DNS or the like. By transmitting in this manner, the number of transmissions of the body of the e-mail is one for each domain, and there is no need to check the network address after the specified date and time. The time it takes to send all emails is greatly reduced.

However, there are domains for which the network address is not known for some reason at the stage of examining the network address in advance, or domains whose network address has been changed after the examination of the network address until the actual e-mail transmission. May be. Further, at the time of actual transmission, an error may be notified from the network side for some reason, and there may be an e-mail that could not be delivered correctly. These cannot be correctly transmitted by the first transmission means. Therefore, in the present invention, the second transmission means which exists independently of the above-mentioned first transmission means uses the same method as the ordinary e-mail transmission method described in the section of the prior art, that is, the transmission method. When the DNS or the like is queried to obtain the network address,
An e-mail which cannot be transmitted by the transmission means (cannot be transmitted) is transmitted.

[0019]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a mail transmission system according to an embodiment of the present invention.

This mail transmission system is realized as a computer (server device) connected to the Internet 10, and includes, as hardware, a communication interface 11, C for connecting to the Internet 10.
A data processing unit 12 including a PU (Central Processing Unit) and a memory; an external storage device 13 such as a hard disk used for storing a destination list; a console 14 including a keyboard and a display device; and recording of programs and data It comprises a reading device 15 for reading the medium 30. The external storage device 13 can be used as a spool area for storing a network address (IP address) checked by the search unit 22 described later or for temporarily storing an e-mail that has failed to be transmitted or an unsendable mail address. used. The mail transmission system broadcasts an e-mail with the same text to a number of destinations by designating a date and time. In the case of broadcast transmission, a mail address to be addressed is given to this mail transmission system in advance (for example, about one day before) as a list. The body of the email to be sent is
What is necessary is just to input into this mail transmission system just before transmission.

The data processing unit 12 includes a list input unit 21 for reading the above-mentioned list and storing it in the external storage device 13, a search unit 22 for searching a network address of a domain when a domain name is given,
Based on the list stored in the external storage device 13, the destination addresses are grouped for each domain to which the destination belongs, and the destination determining means 23 for searching by the search means 22 the network address of the domain to which the destinations described in the list belong. With regard to the e-mail to the destination belonging to the domain whose network address has been checked by the transmission destination deciding means 23, the e-mail for the destination compiled by the transmission destination deciding means 23 is transmitted collectively to the Internet 10. A first mail server 24,
After a search unit 22 searches for a network address of a domain to which an e-mail is addressed, a second mail server 25 that transmits the e-mail to the Internet 10 and an operating system (OS) 26 are provided. I have. First mail server 24 and second mail server
Correspond to a first transmission unit and a second transmission unit, respectively. Second mail server 25
Transmits an e-mail to an e-mail address that cannot be transmitted by the first mail server 24, and transmits an e-mail transmitted by the first mail server 24 but not successfully delivered due to an error notification from the Internet 10. Provided for retransmission. The search means 22
By inquiring a DNS (domain name server) on the Internet 10 from the given domain name, a network address (IP address) corresponding to the domain is obtained.

In this embodiment, the above-described list input means 21, search means 22, transmission destination determination means 23, first
The mail server 24, the second mail server 25, and the operating system 26 are all realized by software. Assuming that the operating system 26 is pre-installed on the computer that constitutes this mail transmission system,
List input means 21, search means 22, transmission destination determination means 2
3. First mail server 24 and second mail server 2
Recording medium 30 storing a program for realizing 5
Is read by the reading device, the list input means 21, the search means 22, the transmission destination determination means 23, the first mail server 24 and the second mail server 25 are actually configured in the data processing unit 12. Become. of course,
A program for realizing the list input means 21, the search means 22, the destination determining means 23, the first mail server 24 and the second mail server 25 together with the program for realizing the operating system 26 is stored in the recording medium 30.
May be stored in the file. When the operating system 26 is a UNIX or UNIX clone, the list input means 21, the search means 22, the destination determination means 23, the first mail server 24 and the second mail server 25 are processed as processes on this computer. Be executed. In particular, the first mail server 24 and the second mail server 25 are mutually independent processes. Examples of the recording medium 30 include a portable medium such as a magnetic tape, a CD-ROM and a floppy disk, and a storage device such as a hard disk.

Next, the operation of the mail transmission system will be described. FIG. 2 is a diagram for explaining the outline of the processing flow.

In this embodiment, a list of destinations to be broadcast is given in advance. For example, a list as shown in FIG. 3 as an address list 40 is provided.
Such an address list 40 is stored, for example, via a network or the console 14 or the reading device 1.
5 is received by the list input means 21 and stored in the external storage device 13. Then, when a set time before the transmission date and time specified in advance is reached, the destination determining means 23 is activated, and then the searching means 22 is activated by the destination determining means 23, and the network address (IP address) is activated. Is searched in advance.
In the address list 40 shown in FIG. 3, the mail addresses of the respective destinations are described in a form sorted in alphabetical order based on the domain name. However, the address list is not actually sorted in such a manner. May be created. However, in the present embodiment, addresses are grouped for each domain to which the destination belongs, and
To minimize the number of searches for the P address, if an unsorted address list is given, the destination deciding means 23 stores the address list 40 in the external storage device 13 before storing the address list 40 in alphabetical order of the domain names. It is preferable to sort by.

In the prior search of the IP address, the search means 2
2, the IP address of each domain to which the destination included in the address list 40 belongs is searched. At the time of the preliminary search, each DNS on the Internet 10 is queried for its IP address. Then, for the domain whose IP address is known, the transmission destination determination unit 23
Generates the IP address table 41 and stores the external storage device 13
To be stored. The IP address table 41 records, for each domain, its domain name and IP address, and mail addresses of destinations belonging to the domain among the destinations in the address list 40. In the illustrated example, among the destinations in the address list 40, aa1 @ aaa.
co.jp, aa2@aaa.co.jp, ..., aa9@aaa.co.jp belong to the domain aaa.co.jp. In addition, the IP address of the domain aaa.co.jp is found as a result of the search as "111.111.11
1.111 ”. as a result,
In the IP address table 41, regarding the domain aaa.co.jp, the domain name and the IP address (“111.111.111.
111 ") and the destination address belonging to that domain (aa1
@ aaa.co.jp, aa2@aaa.co.jp,…, aa9@aaa.co.jp). In this way, addresses of destinations belonging to the domain are collected for each domain.

However, when a pre-search is performed, a domain may not be obtained for some reason. In the illustrated example, it is assumed that the IP address of the domain ppp.co.jp to which pp1@ppp.co.jp belongs cannot be searched for among the destinations in the address list 40. The destination determining means 23
For such a domain, an address unknown domain table 42 is created and stored in the external storage device 13. The address unknown domain table 42 has the same configuration as the IP address table 41, but differs in that no IP address is recorded. Also in this address unknown domain table 42, for each domain (domain for which the IP address could not be searched), the mail addresses of the destinations belonging to that domain are collected.

Since the number of domains to be searched is large and the DNS includes an inquiry to the DNS on the Internet 10, the pre-search is preferably performed during a time period when network traffic is relatively small, for example, from the night to dawn. If the designated date and time of the e-mail transmission is 3:00 pm on May 1st, the pre-search should be started immediately before the designated date and time or at a night before a predetermined period, for example, at about 10:00 pm on April 30. Good. If the interval from the pre-search to the designated transmission date and time is too long, the IP address is changed during that period, and transmission errors frequently occur during the actual transmission. Is not preferred.

It is assumed that the IP address table 41 and the address unknown domain table 42 are generated as a result of the preliminary search as described above, and the transmission designated date and time is reached. Then, the first mail server 24 and the second mail server 25 are activated,
The actual e-mail transmission starts.

Referring to the IP address table 41, the first mail server 24 collectively transmits e-mails to destinations belonging to each domain, as shown in FIG. To explain by giving a specific example, first, assuming that the mail is transmitted collectively to the domain aaa.co.jp, first, while reading the mail, the IP address for the domain aaa.co.jp is read from the IP address table 41, Read the address of the destination belonging to this domain. Then, using the IP address read from the IP address table 41, the electronic mail to these destinations is transmitted collectively. At this time, the mail 43 is composed of a body and a header, and the header includes the domain aaa.co.jp
IP address ("111.111.111.111") and domain a
Email addresses of all destinations belonging to aa.co.jp (aa1 @
aaa.co.jp, aa2@aaa.co.jp, ..., aa9@aaa.co.jp). Therefore, mail transmission to the domain aaa.co.jp is performed only once. Sent mail 4
3 is transferred on the Internet and the domain aaa.co.j
p, and each destination (aa1@aaa.co.jp, aa2@aaa.co.jp,…, aa) by the mail server of domain aaa.co.jp
9@aaa.co.jp) is copied and stored in the mailbox.

When the transmission of the mail to the domain aaa.co.jp is completed, the first mail server 24 continues
The mail transmission to the domain bbb.co.jp is executed in the same manner as described above, and thereafter, for each domain whose domain name is recorded in the IP address table 41, the destination is sent to the destination belonging to that domain. Send e-mails in bulk. In the transmission processing by the first mail server, the one recorded in the IP address table 41 is used as the IP address corresponding to the domain, and the DNS on the Internet 10 is not inquired about the IP address.

On the other hand, the second mail server 25 searches the DNS on the Internet 10 for the domains described in the
Is searched for to find the IP address of the domain, and the obtained IP address is used to collectively transmit e-mails to destinations belonging to the domain for each domain. Also in the mail transmitted from the second mail server 25, a plurality of mail addresses are recorded in the header portion similarly to the mail transmitted from the first mail server, whereby one domain has a destination belonging to the domain. Will be sent only once.

As a result of the preliminary search, all the destinations described in the address list 40 should have been recorded in either the IP address table 41 or the address unknown domain table 42. And the transmission processing of the second mail server 25,
E-mail should be delivered to all destinations.
However, there is a possibility that some of the e-mails transmitted by the first mail server 24 could not be delivered to the final destination due to a reason such as a change in the IP address after the preliminary search. When the e-mail is not delivered, an error message is sent back from the Internet 10 side. Therefore, in the present embodiment, the e-mail that has not been correctly delivered is temporarily stored in the spool area of the external storage device 13 and the
The e-mail is resent by using the mail server 25 of the above-described manner in a normal procedure, that is, a procedure of examining the IP address of the destination domain by DNS or the like at the time of transmission.

FIG. 4 shows this first transmission including such retransmission.
6 is a flowchart showing a flow of a transmission process by the mail server 24 of FIG. First, based on the mail delivery protocol on the Internet 10, the first mail server 24 sends the mail to the IP address of the destination domain (step 51). If you can't send to that domain,
Since an error message is returned from the Internet 10, the error message is detected. It is determined whether transmission is impossible based on the presence or absence of the error message (step 52). If transmission is not possible, the process is terminated as it is when the e-mail was successfully transmitted. On the other hand, if the transmission is not possible, the corresponding e-mail is stored in the spool area (step 53).
(Step 54).
The process ends.

As described above, the transmission of the mail according to the present embodiment is completed. If the pre-search for the IP address has been correctly executed, the e-mail should be transmitted by the first mail server 24 to most destinations. In the present embodiment, not only the e-mail is transmitted collectively for each domain to which the destination belongs, but also the first mail server 24 transmits the e-mail using the IP address obtained by the preliminary search. DN
The time required for obtaining an IP address by S or the like is completely unnecessary, and the time required to finish sending an e-mail to all destinations is greatly reduced compared to the conventional broadcast transmission method. . Further, since the first mail server 24 does not handle retransmission processing and the like, it is possible to solve the problem that transmission cannot be performed at the time when transmission was originally possible if there is no error due to occurrence of an error or the like.

Further, in the present embodiment, the actual transmission processing can be distributed to a plurality of machines (computers). With this configuration, the communication load per unit is reduced, and it is possible to finish sending the e-mail in a shorter time. In this case, the pre-search is performed intensively by one machine, and the IP address table 41 and the address unknown domain table 4 obtained by the pre-search are used.
2 is divided in units of domains and distributed to a plurality of machines to perform transmission processing.

FIG. 5 is a block diagram showing an arrangement when such a distributed processing is performed. A LAN (local area network) 61 is connected to a computer 62 that performs pre-search and transmission processing and a plurality of computers 63 that perform only transmission processing. Here, each computer 6
For 2,63, only the main parts are shown, and the operating system, external storage device, reading device, console, communication interface, etc. are not shown. Each of the computers 62 and 63 is connected to the Internet. Computer 62 that performs pre-processing and transmission processing
Is provided with a list input means 21, a search means 22, a destination determination means 23, a first mail server 24 and a second mail server 25. On the other hand, the computer 63 that performs only the transmission process is provided with the search unit 22, the first mail server 24, and the second mail server 25. Note that the computer 63 also needs the search unit 22 for the function of the second mail server 25.

In this system, the IP generated by the destination determining means 23 of the computer 62 by the preliminary search
The address table 42 and the address unknown domain table 43 are divided and assigned to the respective computers 62 and 63 in units of domains. IP address table 42 for each computer 63
And the address unknown domain table 43 is the LAN 61
Is transferred from the computer 62 to the computer 63 via the. Then, when the designated transmission date and time comes, each of the computers 62 and 63 collectively transmits an e-mail to the domain assigned to each.

[0038]

As described above, according to the present invention, a list of addresses of destinations is prepared in advance when an e-mail of the same text is transmitted to a plurality of destinations, and the network address of the domain to which each destination belongs is prepared. By pre-searching in advance and sending e-mail for each domain at once using the pre-searched network address, it is possible to significantly reduce the time it takes to send all e-mails to multiple destinations. effective. In addition, by providing a first transmission unit that uses the result of the preliminary search and a second transmission unit that checks a network address each time transmission is performed, an e-mail can be reliably transmitted to each destination. At the same time, there is an effect that the transmission time of another e-mail is maintained at the original time even if retransmission processing is required.

[Brief description of the drawings]

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

FIG. 2 is a diagram illustrating an outline of a processing flow in the mail transmission system of FIG. 1;

FIG. 3 is a diagram illustrating an example of an address list indicating a destination and an IP address table generated corresponding to the address list;

FIG. 4 is a flowchart illustrating a transmission process.

FIG. 5 is a block diagram showing a case where a mail server is distributed and arranged in a plurality of computers.

FIG. 6 is a diagram illustrating a conventional process for transmitting an e-mail with the same text to a number of destinations.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Internet 11 Communication interface 12 Data processing unit 13 External storage device 14 Console 15 Reading device 21 List input means 22 Search means 23 Destination determination means 24 First mail server 25 Second mail server 26 Operating system 30 Recording medium 40 Address List 41 IP address table 42 Address unknown domain table 43 Email 51-54 Step 61 LAN 62, 63 Computer

Claims (7)

[Claims] 1. Mail transmission for transmitting an e-mail of the same text to a plurality of destinations via a network to which data is transferred by specifying a network address of a domain to be a receiving side by performing route control by a network address. In the system, the address of each destination includes the name of the domain to which the destination belongs, and for the domain whose network address is known in the mail transmission system, the e-mail to the destination belonging to the domain is batched. First transmitting means for transmitting the electronic mail to the network, and searching for a network address of the domain with respect to an electronic mail to a destination belonging to a domain whose network address is unknown in the mail transmitting system. The said network And a second transmitting means for transmitting the information on the mail. 2. A plurality of destinations listed in a list of e-mails having the same text via a network to which data is transferred by designating a network address of a domain to be a receiving side by performing route control by a network address. In the mail transmission system for sending to the destination, the address of each destination includes the name of the domain to which the destination belongs, and search means for searching the network address of the domain from the name of the domain; The destination addresses are collected for each domain to which they belong, and the destination address determining means for searching the network addresses of the domains to which the destinations listed in the list belong by the search means, and the network address is checked by the destination determining means. Destination belonging to the domain The first transmitting means for transmitting the e-mails of the destinations collected by the destination determining means collectively on the network, and no network address was found by the destination determining means. A second transmission unit that, after searching for a network address of the corresponding domain by the search unit with respect to an e-mail to a destination belonging to the domain, transmits the e-mail to the network. Email sending system. 3. The electronic mail according to claim 1, wherein the electronic mail transmitted on the network by the first transmitting means, but the transmission failure is notified from the network, is transmitted again by the second transmitting means. Email sending system. 4. An electronic mail having the same text is sent from a site on a transmission side to a plurality of destinations via a network to which data is transferred by designating a network address of a domain on a receiving side by performing route control by a network address. In the method of sending an e-mail, the address of each destination includes the name of the domain to which the destination belongs, and for the domain whose network address is known at the site on the sending side, the destination belonging to the domain A first transmitting step of transmitting e-mails to the network in a lump on the network, and for an e-mail to a destination belonging to a domain whose network address is unknown at the site of the transmitting side, After searching, the email is sent to the Internet A second transmission step of transmitting data on a work, wherein the first transmission step and the second transmission step are independently executed. 5. An electronic mail having the same body text is sent to a plurality of destinations listed in a list via a network to which data is transferred by specifying a network address of a domain to be a receiving side by performing a route control by the network address. The address of each destination includes the name of the domain to which the destination belongs, and based on the list, the addresses of the destinations are grouped for each domain to which the address belongs, and the addresses are described in the list. A destination address determining step of searching a network address of a domain to which the received destination belongs from a name of the domain; and an e-mail to the destination belonging to the domain whose network address has been checked in the destination determining step. The electronic mail for the destination compiled by the confirmation process A first transmission step of transmitting all addresses on the network collectively, and for an e-mail to a destination belonging to a domain for which a network address was not found in the destination determination step, a network address based on the name of the domain And transmitting the e-mail over the network. The first transmitting step and the second transmitting step are performed independently. How to send email. 6. An electronic mail having the same text is transmitted to a plurality of destinations via a network to which data is transferred by designating a network address of a domain to be a receiving side by performing route control by the network address. In a recording medium storing a program used for a mail transmission system in which an address for each destination includes a name of a domain to which the destination belongs, a domain whose network address is known in the mail transmission system belongs to the domain. A first transmission procedure of transmitting e-mails to a destination collectively on the network, and a domain which is executed as a process independent of the first transmission procedure, and whose network address is unknown in the mail transmission system. Email to destinations belonging to For, after searching the network address of the domain, a recording medium storing a program for executing a second transmission step of transmitting the e-mail over the network. 7. An electronic mail having the same body text is sent to a plurality of destinations listed in a list via a network to which data is transferred by specifying a network address of a domain on a route which is route-controlled by a network address and is a receiving side. In a recording medium storing a program used for a mail transmission system in which the address of each destination includes the name of the domain to which the destination belongs, based on the list, the address of the destination for each domain to which the destination belongs And a destination determining procedure for searching a network address of a domain to which the destination described in the list belongs from a name of the domain; and a destination belonging to a domain whose network address has been checked by the destination determining procedure. About the e-mail, A first transmission procedure for an e-mail destination component that is being gathered by the procedure collectively transmits onto the network, from the first transmission procedure is executed as a separate process,
A second transmission step of searching for a network address from the name of the domain for an e-mail to a destination belonging to a domain for which a network address was not found in the destination determination procedure, and transmitting the e-mail to the network And a recording medium storing a program for executing the program.