JP2002247102A - Mail transmission method and mail server - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mail transmission method and a mail server that transmits divisions of a mail text depending on the number of receptible characters to a mail reception terminal where the number of received characters is limited. SOLUTION: A mail processing server 15 receives a mail transmitted from a terminal 101 via the mail server 10. The mail processing server 15 processes mails in such a way that the mail text is divided into a plurality of mails each having number of characters registered in advance or only header information registered in advance is extracted. Then the mail processing server 15 transmits the processed mail to the terminal 102. Furthermore, the mail processing server 15 transmits the mail text other than that having been sent before on request from the terminal 102.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mail transmission method for dividing a mail text according to the number of receivable characters when transmitting a mail to a mail receiving terminal such as a portable telephone having a limited number of characters. And a mail server.

[0002]

2. Description of the Related Art The mail transmission / reception function of a portable terminal is often limited in the number of characters received. When the mobile terminal receives a sentence that exceeds the number of characters that can be received, the portion that exceeds the number of characters is automatically deleted. For example, as shown in FIG.
When the mail text of 0 characters is transmitted, the 251st to 300th characters are deleted. As described above, since the e-mail text cannot be confirmed to the end, necessary information may be missed. Further, since the number of characters of the e-mail text is unknown, it is not known how much the deleted text is.
Also, if the sender divides a long email into multiple emails and sends them, it must be received multiple times to receive them, and even if those emails are unnecessary, communication charges will be incurred. I have to pay. On the other hand, even if the sender prepares the mail text in advance according to the character limit of the receiving terminal, it is troublesome to check in advance because the character limit varies depending on the model and the manufacturer.
In addition, even if it is intended to send to a terminal such as a PC which has no limit on the number of characters to be received, the receiver may set to transfer to a mobile phone or the like.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and when transmitting a mail to a mail receiving terminal having a limited number of characters, the number of characters that can be received by the receiving terminal depends on the number of characters that can be received by the receiving terminal. It is intended to provide a mail transmission method and a mail server for dividing a mail text and transmitting the divided text.

[0004]

In order to achieve the above object, according to the first aspect of the present invention, there is provided a mail server using a mail server which stores and holds the number of characters received by a communication terminal which has been contracted in advance. In the transmission method, the mail server is configured to divide a mail received via a communication network to the communication terminal based on the number of received characters to be stored and held; And a second step of transmitting the e-mail to the communication terminal. 2. The second step in the invention according to claim 1, wherein the divided mail is transmitted to the communication terminal, and when a transmission request for an untransmitted portion is received from the communication terminal, the untransmitted portion is transmitted to the communication terminal. This is a mail transmission method characterized in that the mail is transmitted to a mail. A second step in the first aspect of the present invention is a mail transmission method, wherein the number of characters of an untransmitted portion is displayed on the divided mail. According to a fourth aspect of the present invention, there is provided a mail server for transmitting an e-mail received via a communication network to a communication terminal to which a contract has been made in advance, wherein the storage means for storing the number of characters received by the communication terminal; A mail server comprising: a dividing unit that divides a mail to a terminal based on the number of characters received in the storage unit; and a transmitting unit that transmits the divided mail to the communication terminal. The invention according to claim 4, wherein the storage means further stores a specific mail address, and further comprises a conversion means for converting a mail address of a mail transmitted to the specific mail address to a mail address of the communication terminal. A mail server characterized by the following. The invention according to claim 4, wherein the storage means further stores another mail server and a specific mail address, accesses the other mail server, and takes in the mail transmitted to the specific mail address. And a converting means for converting a mail address of the mail transmitted to the specific mail address to a mail address of the communication terminal.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, a terminal 101 is a sender's PC (personal computer), and its transmission mail address is “tani@mail.ne.jp”. Terminal 10
Reference numeral 2 denotes a receiver's mobile phone whose mobile mail address is “yama@kmail.ne.jp”. Reference numeral 10 denotes a mail server that sorts mail transmitted to and received from the terminal 101 on the Internet. Reference numeral 15 denotes a mail processing server, which processes and sends a mail to the terminal 102 in the mobile phone network. FIG. 2 shows details of the mail processing server 15. In FIG. 2, the processing means 15a is means for processing mail. The mail transmission information 15b is means for recording the registration information of the recipient. The storage means 15c is means for storing the mail processed by the processing means 15a. The terminals 101 and 102 are connected to the Internet 50 via the mail server 10 and the mail processing server 15. The recipient accesses the mail processing server 15 using the terminal 102 in advance, and registers the number of receivable characters, reception conditions, and the like. An example is shown below. Transmission condition: Full text transmission Remaining character number notification: No Receivable character number: 250 characters Remaining character reception: No The registration information is recorded in the mail transmission information 15b.

Next, an example of the operation in the above configuration will be described with reference to FIG. First, the sender uses the terminal 101 to write a 300-character mail sentence whose subject is “about meeting information” to the mobile mail address “yama@kmail.ne.
jp ”. At that time, the sending mail address“ tani @ m
The information "ail.ne.jp" is automatically added (in FIG. 3). The transmitted mail is received by the mail processing server 15 via the mail server 10. The mail processing server 15 first sends the mail text. Count the number of characters
Calculate that it is 00 characters. Next, referring to the mail transmission information 15b, the mobile mail address “yama@kmail.ne.
The terminal 102 that is “jp” confirms that the number of receivable characters is 250 and that the setting is made to transmit the entire text. Next, the number of characters of the counted mail text (300
Character) and the number of receivable characters (250 characters) and compare the subject “Conference information” transmitted from the terminal 101.
Is divided into 250 characters, which is the number of receivable characters, and the remaining 50 characters, and is once stored in the storage unit 15c (in FIG. 3). Next, the subject transmits the mail of the first to 250th characters to the terminal 102 as “About the meeting guidance”. Further, the terminal 50 automatically assigns “001” to the end of the subject to the remaining 50 characters of the mail text and sets “Subject” to “001 for the meeting guide”.
02 (in FIG. 3).

Next, another operation example in FIG. 1 will be described. The recipient accesses the mail processing server 15 using the terminal 102 in advance, and registers the number of receivable characters, reception conditions, and the like. An example is shown below. Full text transmission: Not available Remaining character number notification: Yes Receivable character number: 100 characters Remaining character reception: Yes The registration information is recorded in the mail transmission information 15b. Next, an example of the operation under the above-described registration conditions will be described with reference to FIGS. First, the sender uses the terminal 101 to write a 300-character mail sentence whose subject is “about meeting information” to the mobile mail address “yama@kmail.ne.
jp ”. At that time, the sending mail address“ tani @ m
ail.ne.jp ”is automatically added (Fig. 4,
6). The sent mail is sent to the mail server 10
Via the mail processing server 15. The mail processing server 15 first counts the number of characters in the mail text and calculates that the number is 300 characters. Next, referring to the mail transmission information 15b, the mobile mail address “yama @ kma”
The terminal 102 of “il.ne.jp” has 10 characters that can be received.
It is zero characters, and it is confirmed that the setting is made so that the whole text is not transmitted at once but the remaining characters can be received if necessary. Next, the mail processing server 15 checks the number of characters (3
(00 characters) and the number of receivable characters (100 characters), the mail text is divided into three by 100 characters, which is the number of receivable characters, and recorded once in the storage unit 15c. At this time, the 101st to 200th characters are changed to “abc001@mail.co.
m ”, from the 201st character to the 300th character is“ abc002 @ ma
il.com ”(in FIGS. 4 and 6). Next, the information of the 100-character mail sentence from the first character and the remaining character number of 200 characters among the divided mails is
t Transmit to the terminal 102 as “about meeting guidance” (in FIGS. 4 and 6).

[0008] The case where the recipient receives 100 characters at a time while checking the contents and the case where the remaining received mail is received all at once will be described. In FIG. 4, the recipient has an additional 100
When requesting the transmission of characters, clicking on the mail address “abc001@mail.com” displayed on the screen of the terminal 3 sends a remaining character request mail as shown in FIG. 5 to the mail processing server 15 (FIG. 5). In FIG. 4). When the mail processing server 15 receives the remaining character request mail, from the received mail address “abc001@mail.com”, “abc001@mail.com” and “abc002 @ mai” recorded in the storage unit 15c.
l.com ”from the 101st character of the two emails
Select the mail text up to the 00th character. Next, the selected mail text is automatically given "001" at the end of the subject, and transmitted to the terminal 102 together with the information that the remaining number of characters is 100 as "Subject" for the conference guide "001" (in FIG. 4). The recipient is 20 from the 101st character
You can see the mail text of the 0th character and the information that the number of remaining characters is 100 characters. When the recipient requests transmission of the remaining 100 characters, clicking on the mail address “abc002@mail.com” displayed on the screen of the terminal 102,
The remaining character request mail is transmitted to the mail processing server 15 (in FIG. 4). The mail processing server 15 selects, from the received mail address “abc002@mail.com”, the 201st to 300th characters of the two divided mails recorded in the storage unit 15c, and sets “0” at the end of the subject.
02 ”is automatically assigned, and Subject”
2 "to the terminal 102 (in FIG. 4).

In FIG. 6, when the receiver receives the remaining received mail at one time, the user clicks “Receive All” displayed on the screen of the terminal 102 and sets “200” which is the remaining number of characters in the subject. A request mail is created by input (in FIG. 6), and the remaining character request mail is transmitted to the mail processing server 15 (in FIG. 6). The mail processing server 15 that has received the remaining character request mail changes the 101st to 200th characters recorded in the storage unit 15c from the remaining character request mail to “001” at the end of the subject.
Is automatically given, and the subject is set to “001” for the meeting guidance. Also, from the 201st character to the 300th character,
“002” is automatically added to the end of the subject, and “Subject” is set to “002” for the meeting guidance. Then, the mail processing server 15 sets the subject “001 for the conference guide” and the
ject “002 about the conference guidance” is transmitted to the terminal 102 (FIG. 6).

Next, another embodiment of the present invention will be described with reference to FIG. The terminal 111 is a PC (personal computer), and its transmission mail address is "
tani@mail.ne.jp ”. The terminal 112 is a PC,
Its basic email address is “xyz@mail.ne.jp”.
The terminal 113 is a mobile phone, and its mobile mail address is “yama@kmail.ne.jp”. Reference numeral 20 denotes a mail server on the Internet 50, which sorts mail transmitted to and received from the terminal 111. 21 is the Internet 50
, And distributes mail transmitted to and received from the terminal 112. Reference numeral 22 denotes a mail server of the mobile phone network, which sorts mail transmitted to and received from the terminal 113. Reference numeral 25 denotes a mail processing server that processes mail to the terminal 113. FIG. 8 shows details of the mail processing server 25. In FIG. 8, the processing means 25a is means for processing the mail. The mail transmission information 25b is a means for recording the registration information of the recipient. In addition, storage means 2
5c is a means for recording the mail processed by the processing means 25a. The transfer unit 25d is a unit that transfers mail. Note that the transfer referred to here is the mail processing server 2
5 sends the e-mail sent to the specific e-mail address for forwarding “abc@mail.com” to the basic e-mail address “xyz@mail.ne.
jp ”and the mobile mail address“ yama @ k ”
This is a function of transmitting to the terminal 113 which is “mail.ne.jp”.

The operation at the time of transmission to the terminal 113 is the same as the operation shown in FIGS. 3, 4, and 6, but an example will be described with reference to FIGS. FIG.
4 shows an example of registration of mail transmission information. First, the sender is terminal 1.
11, a 300-character mail sentence whose subject is “about the meeting guide” is transmitted to the specific mail address for transfer “abc@mail.com”. At that time, the information of the transmission mail address “tani@mail.ne.jp” is automatically added (in FIG. 3). The transmitted mail is received by the mail processing server 25 via the mail server 20.
The mail processing server 25 first counts the number of characters in the mail text and calculates that the number is 300 characters. next,
Referring to the condition shown in the first section of FIG. 11 from the mail transmission information 25b, the terminal 113 having the mobile mail address “yama@kmail.ne.jp” has 250 characters that can be received,
Make sure you have set up to send the full text.
Next, the number of characters in the mail text (300 characters) is compared with the number of receivable characters (250 characters), and the subject sent from the terminal 111 is sent. It is divided into characters and recorded once in the storage means 25c (in FIG. 3). Next, the divided 250-character mail is transmitted to the terminal 113 via the mail server 22 as the subject “about the meeting guidance”. Further, the mail text of the remaining 50 characters is automatically added with “001” at the end of the subject, and S
ubject “001 for the conference guide” and sends it to the terminal 113 via the mail server 22 (in FIG. 3). Next, since the terminal 112 having the basic mail address “xyz@mail.ne.jp” does not set the number of receivable characters, the terminal 112 passes through the mail server 21 without processing it.
ect Send an e-mail sentence "About meeting information". The mail processing server 25 converts the mail address of the mail transmitted to the terminal 112 having the basic mail address “xyz@mail.ne.jp” into the mobile mail address “yama @ k”.
mail.ne.jp ", and the mail text may be processed by the operations shown in FIGS. 3, 4 and 6 described above and transmitted to the terminal 113.

Next, another embodiment will be described with reference to FIG. The terminal 121 is a PC (personal computer), and its transmission mail address is “tani
@ mail.ne.jp ". The terminal 122 is a PC, and its basic mail address is" xyz@mail.ne.jp ". The terminal 123 is the receiver's mobile phone, and its mobile mail address is “Yama@kmail.ne.jp” 30 is a mail server on the Internet 50 that sorts mail sent to and received from the terminal 121. 31 is a mail server on the Internet 50 and sends mail sent to and from the terminal 122. Reference numeral 32 denotes a mail server of the mobile telephone network, which distributes mail transmitted to and received from the terminal 123. Reference numeral 35 denotes a mail processing server, which processes mail to the terminal 123. Details of the mail processing server 35 are shown in FIG. 10, the processing means 35a is a means for processing the mail, and the mail transmission information 35b records and sets the registration information of the recipient. The storage means 35c is a means for recording the mail processed by the processing means 35a, and the proxy mail receiving means 35e accesses the mail server 31 periodically, fetches the mail received by the terminal 122, and In the proxy mail receiving means 35e, the recipient receives a user ID for accessing the mail server 31 in advance.
D, a password, and an access number are registered. The proxy mail receiving means 35e uses the mail server 3
1 regularly access the basic email address “xyz @ ma
Terminal 1 whose mobile e-mail address is “yama@kmail.ne.jp” automatically takes in the mail sent to “il.ne.jp”.
23.

The operation of transmitting to the terminal 123 is the same as the operation shown in FIGS. 3, 4, and 6, but one example will be described with reference to FIGS. 4, 6, and 11. First, the sender uses the terminal 121 to send a 300-character mail sentence whose subject is “about meeting guidance” to the reception address “xyz@mail.ne.jp”. At this time, the information of the transmission mail address “tani@mail.ne.jp” is automatically added (in FIGS. 4 and 6). The transmitted mail is transmitted to the mail server 31 via the mail server 30 and recorded. The mail processing server 35 regularly accesses the mail server 31 by the proxy mail receiving means 35e. At this time, the basic mail address “xyz @
If the mail has arrived at "mail.ne.jp", the mail is taken in. The mail processing server 35 first counts the number of characters in the mail text and calculates that it is 300 characters. From 35b, referring to the condition shown in the second section of FIG. 11, the mobile mail address “yama@kmail.n
The terminal 123 of "e.jp" confirms that the number of characters that can be received is 100 characters, and that the setting is such that the whole text is not transmitted at once, but that the remaining characters can be received as necessary. Characters (300 characters) and receivable characters (1
00 characters) and divides the fetched mail sentence into three, each with 100 characters, which is the number of characters that can be received. The 101st through 200th characters are “abc001@mail.com”, and the 201st through 300th characters As "abc002@mail.com" in the storage means 35c (in FIGS. 4 and 6).
Next, the information of the mail sentence of the first 100 characters of the divided mail and the number of remaining characters of 200 is added to the Subjec
t The message is transmitted to the terminal 123 via the mail server 32 as “about the meeting guidance” (in FIGS. 4 and 6).

The case where the recipient receives 100 characters at a time while confirming the contents and the case where the remaining received mail is received all at once will be described. In FIG. 4, the recipient has an additional 100
When requesting the transmission of characters, clicking on the mail address “abc001@mail.com” displayed on the screen of the terminal 3 sends a remaining character request mail, an example of which is shown in FIG. 5, to the mail processing server 35 ( In FIG. 4). When the mail processing server 35 receives the remaining character request mail, the mail processing server 35 reads “abc001@mail.com” and “abc002 @ mai” recorded in the storage unit 35c from the received mail address “abc001@mail.com”.
l.com ”from the 101st character of the two emails
Select the mail text up to the 00th character. Next, “001” is automatically added to the subject of the selected mail text at the end of the subject, and “Subject” is set to “001” for the meeting guidance.
23 (in FIG. 4).

The recipient can see the mail text from the 101st character to the 200th character and the information that the remaining character number is 100 characters. When the recipient requests transmission of the remaining 100 characters, clicking the mail address “abc002@mail.com” displayed on the screen of the terminal 123 transmits the remaining character request mail to the mail processing server 35 (FIG. 4). From the received mail address “abc002@mail.com”, the mail processing server 35 calculates the 30th from the 201st character of the two divided mails recorded in the storage unit 35c.
The characters up to the 0th character are selected, "002" is automatically added to the end of the subject, the subject is set to "002 for the conference guide," and transmitted to the terminal 123 via the mail server 32 (in FIG. 4).

In FIG. 6, when the receiver receives the remaining received mails at one time, the user clicks "Receive All" displayed on the screen of the terminal 123 and sets "200" which is the remaining number of characters in the subject. A request mail is created by input (in FIG. 6), and the remaining character request mail is transmitted to the mail processing server 35 (in FIG. 6). The mail processing server 35 that has received the remaining character request mail changes the 101st to 200th characters recorded in the storage unit 35c from the remaining character request mail to “001” at the end of the subject.
Is automatically given, and the subject is set to “001” for the meeting guidance. Also, from the 201st character to the 300th character,
“002” is automatically added to the end of the subject, and “Subject” is set to “002” for the meeting guidance. Then, the mail processing server 35 sets the subject “001 for the conference guide” and the
ject ”is transmitted to the terminal 123 via the mail server 32 (in FIG. 6).

Note that the specific mail address for transfer "abc @ ma
e-mail sent to il.com will be replaced with the basic e-mail address
xyz@mail.ne.jp ”and mobile email address“ yama@kmail.n
e.jp ”and the mobile mail address“ yama@kmail.n ”
e.jp ”, send up to 200 characters,
The remaining characters can also be made unreceivable, and an example of the setting is shown in the third section of FIG. In addition, the e-mail sent to the specific e-mail address for forwarding “abc@mail.com” is converted to the basic e-mail address “xyz@mail.ne.jp” and the mobile e-mail address “ya
ma@kmail.ne.jp ”and the mobile mail address“ ya
When sending to “ma@kmail.ne.jp”, only the sender, Sbject, Data, To, Cc, etc. header information is received without receiving the body text, and a body transmission request is sent as necessary An example of the setting is shown in item 4 in Fig. 11. Also, the file attached to the mail can be divided and transmitted as described above. Is a numerical value that can be set arbitrarily, and the maximum number of characters is the maximum value that the terminal that receives mail can receive.The mail processing servers 15, 25, and 35 calculate 2 bytes as one character, The above-described mail text is counted, divided, and the remaining characters are calculated.The Internet in FIGS.1, 7, and 9 includes the Internet, a mobile telephone network, and a general telephone network.

A program for realizing the functions of the mail processing servers 15, 25, and 35 in FIGS. 1, 7, and 9 is recorded on a computer-readable recording medium, and the program recorded on this recording medium is stored in a storage medium. It may be read and executed by a computer system. Here, the “computer system” includes an OS and hardware such as peripheral devices. The “computer system” also includes a homepage providing environment (or a display environment) if a WWW system is used. The “computer-readable recording medium” means a portable medium such as a floppy (registered trademark) disk, a magneto-optical disk, a ROM, a CD-ROM, and a storage device such as a hard disk built in a computer system. . Further, a "computer-readable recording medium" refers to a communication line for transmitting a program via a network such as the Internet or a communication line such as a telephone line, and dynamically holds the program for a short time. In this case, it is also assumed that a program that holds a program for a certain period of time, such as a volatile memory in a computer system serving as a server or a client in that case, is included. Further, the above-mentioned program may be for realizing a part of the above-mentioned functions, or may be for realizing the above-mentioned functions in combination with a program already recorded in a computer system. The embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to the embodiments, and includes a design and the like within a range not departing from the gist of the present invention.

[0019]

As described above, according to the present invention, in a mail transmission method using a mail server having a storage unit for storing the number of received characters of a communication terminal to which a contract has been made in advance, a method of receiving via a communication network A first step of dividing the mail to the communication terminal based on the number of received characters in the storage unit, and a second step of transmitting the divided mail to the communication terminal.
The recipient can read the entire text even if the mail exceeds the character limit, and the sender can send the mail without worrying about the character limit of the receiving terminal. Further, the divided mail is transmitted to the communication terminal, and when a transmission request for an untransmitted portion is received from the communication terminal, the untransmitted portion can be transmitted to the communication terminal. Before receiving the entire sentence, you can read only a part of the email sentence and determine whether the email is necessary or unnecessary,
There is no need to pay unnecessary communication charges. Further, since the method has a process of adding character data for displaying the number of characters of the unsent portion to the divided mail, the receiver can know the number of remaining characters, and the unsent portion is required or is not necessary. To help you determine Further, the storage unit further stores another mail server and a specific mail address, accesses the other mail server, takes in the mail transmitted to the specific mail address, and transmits the mail to the specific mail address. And a fourth step of converting the e-mail address of the received e-mail into the e-mail address of the communication terminal, so that when the recipient views the e-mail transmitted to a terminal such as a PC that has no limit on the number of characters received, It can be viewed on terminals with a limited number of characters. Further, the storage unit further stores a specific mail address, and further includes a fourth step of converting a mail address of the mail transmitted to the specific mail address to a mail address of the communication terminal, so that the mail is transferred. Even if the sender does not know to which receiving terminal, the sender can transmit without worrying about the limited number of characters of the receiving terminal.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is a block diagram showing a structure of a mail processing server 15 in the embodiment.

FIG. 3 is a diagram showing an example of an operation according to an embodiment of the present invention.

FIG. 4 is a diagram showing an example of an operation according to an embodiment of the present invention.

FIG. 5 is an example of a remaining character request mail transmitted to the mail processing server in one embodiment of the present invention.

FIG. 6 is a diagram illustrating an example of an operation according to an embodiment of the present invention.

FIG. 7 is a block diagram showing a configuration of one embodiment of the present invention.

FIG. 8 is a block diagram showing a structure of a mail processing server 25 in the embodiment.

FIG. 9 is a block diagram showing a configuration of an embodiment of the present invention.

FIG. 10 is a mail processing server 35 in the embodiment.
FIG. 2 is a block diagram showing the structure of FIG.

FIG. 11 is an example of transmission conditions registered in the mail transmission information.

FIG. 12 is an explanatory diagram showing a conventional technique.

[Explanation of symbols]

 10: mail server 15: mail processing server 15a: processing means 15b: mail transmission information 15c: storage means 20: mail server 21: mail server 22: mail server 25: mail processing server 25a: processing means 25b: mail transmission information 25c: Storage means 25d: transfer means 30: mail server 31: mail server 32: mail server 35: mail processing server 35a: processing means 35b: mail transmission information 35c: storage means 35e: proxy mail receiving means 101: terminal 102: terminal 111: Terminal 112: Terminal 113: Terminal 121: Terminal 122: Terminal 123: Terminal 50: Internet

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Yoshinari Tanaka, Inventor 3-15, Babacho, Chuo-ku, Osaka City, Osaka Prefecture Inside Nippon Telegraph and Telephone Corporation (72) Kikuko Maruta 3, Babacho, Chuo-ku, Osaka City, Osaka No. 15 Nishi Nippon Telegraph and Telephone Corporation F term (reference) 5K030 GA18 HA06 HB19 HD09 KA01 KA05 KA06 LE14 5K067 AA21 BB04 BB21 DD17 DD53 EE02 EE10 EE16 GG01 HH22 KK15

Claims (8)

[Claims] 1. A mail transmission method by a mail server having a storage unit for storing the number of characters received by a communication terminal which has been contracted in advance, wherein a mail to the communication terminal received via a communication network is received in the storage unit. A mail transmitting method, comprising: a first step of dividing based on the number of characters; and a second step of transmitting the divided mail to the communication terminal. 2. The second step includes transmitting the divided mail to the communication terminal and transmitting the untransmitted portion to the communication terminal when receiving a transmission request for an untransmitted portion from the communication terminal. 2. The method according to claim 1, wherein the mail is transmitted. 3. The method according to claim 1, wherein the second step includes a step of adding character data for indicating the number of characters of an untransmitted portion to the divided mail. Email sending method. 4. A mail server for transmitting an e-mail received via a communication network to a pre-contracted communication terminal, comprising: storage means for storing the number of characters received by the communication terminal; A mail server comprising: a dividing unit that divides the mail based on the number of received characters in the storage unit; and a transmitting unit that transmits the divided mail to the communication terminal. 5. The storage device according to claim 1, further comprising a conversion unit configured to further store a specific mail address and to convert a mail address of the mail transmitted to the specific mail address to a mail address of the communication terminal. The mail server according to claim 4. 6. The storage unit further stores another mail server and a specific mail address, accesses the another mail server and takes in a mail transmitted to the specific mail address, 5. The mail server according to claim 4, further comprising a conversion unit configured to convert a mail address of the mail transmitted to the mail address into a mail address of the communication terminal. 7. A mail server for storing and holding the number of received characters of a communication terminal subscribed to in advance, wherein the mail server converts the received mail to the communication terminal received via a communication network into the number of received characters stored and held. And a second step of transmitting the divided mail to the communication terminal by the mail server. 8. A mail server that stores and holds the number of characters received by a communication terminal that has a contract beforehand, wherein the mail server converts the mail received via the communication network to the communication terminal into the number of characters that is stored and held. A computer-readable recording medium that describes a program for causing a computer to execute a first step of dividing the mail based on the first step and a second step of transmitting the divided mail to the communication terminal.