JP2003060710A - Distributed mail system having inter-attribute as object - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a safe and convenient mail environment in which mail addresses are used differently according to mail by uses, mail is basically sent between attributes, transmitted mail can be corrected, whether the transmitted mail has been read can be confirmed and a receiving side can be controlled. SOLUTION: This mail environment includes user communication terminals 60 and 61 connected to the Internet 50 and servers 10 and 30 connected to the Internet 50 and for communicating with the user communication terminals to transmit and receive mail and also controlling mail information, the servers include virtual mail boxes 11a, 11b and 31a to 31c for exchanging information only between users to each other established by uses and user databases 12 and 32 utilized by the users of the communication terminals, and the user databases include distribution information 13 and 33 for storing mail to be transmitted, index information 14a, 14b and 34a to 34c for extracting the distribution information, virtual mail box setting information 15 and 35 for recording information about the virtual mail boxes and received information 16 and 36 for storing received mail.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distributed mail system targeting between attributes. More specifically, the purpose and purpose (hereinafter referred to as "attribute") can be properly used, and the connection between attributes can be utilized. By distributing and storing data and clarifying the responsibility of the sender, you can send and receive mail safely and conveniently, and convey it easily without using long email addresses for each attribute. Use easy names,
The present invention relates to a mail system in which mail addresses can be easily distributed by referring to dictionary data and converting them into appropriate mail addresses.

[0002]

2. Description of the Related Art In a conventional mail system for sending via the Internet, if you know the mail address, you can basically send the mail. I don't know, I can change the sender freely for the convenience of the sender, but I can fake it, so even if I set a call rejection, it does not work effectively and it is difficult to judge the mail I want to reject.

Also, since the distribution cost is extremely low, regardless of the relationship between the sending side and the receiving side, it is possible to send at random and receive mail by the sender's convenience, and spam mail becomes social. It's a problem. The most effective solution to this problem is to use different e-mail addresses and use e-mail addresses that may be known, dedicated e-mail addresses for specific people, etc.

However, since it is not considered that one person uses a plurality of mail addresses properly, the environmental configurations of the server and the client are not consistent and there are many problems in terms of management. On the other hand, there are not a few people who sort and manage by use after receiving, and when sending mail, it is certain that they basically convey from person to person, but in each position, that is, specific information between certain attributes. Although it is easy to understand, it is not a proper system.

Although it may be unavoidable from the concept of mail, there is a problem that it cannot be corrected after sending, and it is impossible to deal with it after sending, such as not knowing whether it was read.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and its purpose is to use different mail addresses for different purposes and send mail between attributes. It is to provide a safe and convenient mail environment where you can check the correction after sending and whether it has been read, and the receiver can control it.

Another object of the present invention is to facilitate distribution of a long and long mail address generated by properly using mail addresses for different purposes and to distribute the mail addresses.

[0008]

In order to achieve these objects, the invention according to claim 1 is a user communication terminal connected to the Internet used for sending and receiving mail, and connected to the Internet, and The server includes a server that interacts with a user communication terminal to send and receive mail, and that controls mail information. The server is a virtual mailbox that is used for exchanging information only between users and is established for each purpose. A user database used by a user of the communication terminal, wherein the user database records delivery information in which an email to be sent is stored, index information for extracting the delivery information, and information about the virtual mailbox. Virtual mailbox setting information and received information in which the received mail is stored, Virtual mailbox setting information of the user database is referenced through the mailbox, index information is sent and received according to the setting, delivery information of the user database of the sender is referenced to retrieve the mail, and mail is also sent as necessary. Is stored in the reception information in the user database on the receiving side or in the communication terminal, the sender can refer to the reference record to determine whether the recipient saw the mail, and the latest information can be determined by serial, and even after the transmission. It is characterized by a structure that can be corrected.

According to a second aspect of the present invention, a user communication terminal connected to the Internet used for sending and receiving mail and a user communication terminal connected to the Internet and interacting with the user communication terminal are used for sending and receiving mail. ,
And servers which mail information is controlled, is connected to the Internet, and a dictionary conversion server that interacts with the user communication terminal used in place of the mail address character string (including symbols) is converted to a mail address In addition, the dictionary conversion server includes an address conversion dictionary database having a basic dictionary, and the server has a function of converting a character string used in place of a mail address into a mail address like the dictionary conversion server, and the basic dictionary. And an address translation dictionary database having a user dictionary and a box dictionary, a virtual mailbox for exchanging information only between users established for each purpose, and a user database used by a user of the communication terminal. The database contains delivery information that stores the emails you send,
Index information for extracting the distribution information,
A user communication terminal, which includes virtual mailbox setting information in which information about the virtual mailbox is recorded and reception information in which received mail is stored, and which includes the dictionary conversion server and the address conversion dictionary database in each of the servers. Is characterized by using a name that is easy to remember and convey without using many long-named mail addresses, refers to dictionary data, and converts it into an appropriate mail address for sending and receiving mail.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings and the operation thereof. FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. In the figure, 10 is a server X (hereinafter, simply referred to as a server), 3
A server Y (hereinafter, simply referred to as a server) 0 is connected to the Internet 50. Reference numerals 60 and 61 denote various user communication terminals such as personal computers, and the servers 10 and 30.
Is connected to the Internet 50 in the same manner as. 7
Reference numeral 0 is a dictionary conversion server connected to the Internet 50.

In such an overall configuration, in the mail system according to the present invention, the contents of the mail are basically stored on the sending side, index information for sending out the mail is sent, and the receiving side reaches the virtual mailbox. The index information is referred to and extracted from the distribution information of the transmission source.

Next, a specific structure will be described. First, the configuration of the servers 10 and 30 will be described. The servers 10 and 30 are virtual mailboxes 11a and 1a, respectively.
1b, 31a, 31b, 31c are included. These virtual mailboxes 11a, 11b, 31a, 31b, 3
Information 1c is used for exchanging information only between users established for each purpose, and serves as a window for sending / receiving mail, referring to mail, and registering mail.

The communication terminals 6 are provided in the servers 10 and 30.
User databases 12, 32 used by users A, B of 0, 61, and these user databases 12, 3,
2 includes delivery information 13 and 33 for storing emails to be sent.
And index information 14a, 14b, 34a, 34b, 34c for extracting the distribution information 13, 33, and virtual mailboxes 11a, 11b, 31a, 31b, 3
It includes virtual mailbox setting information 15 and 35 in which information about 1c is recorded, and reception information 16 and 36 in which received mail is stored.

The dictionary conversion server 70 connected to the Internet 50 includes an address conversion dictionary database 71 having a basic dictionary 72 for converting mail address names by interacting with the user communication terminals 60 and 61.

The servers 10 and 30 further include a basic dictionary 1
8, 38 and user dictionaries 19, 39 and box dictionaries 20,
Address conversion dictionary database 17, 37 having 40
Is included.

Then, the virtual mailboxes 11a, 11
Virtual mailbox setting information 15, 35 of the user databases 12, 32 through b, 31a, 31b, 31c
Is referred to, and the index information 14a, 1 is set according to the setting.
4b, 34a, 34b, 34c are transmitted / received, the delivery information 13 of the user database 12 of the transmission source is referred to, the mail is extracted, and the mail is delivered information 33 of the user database 32 of the receiving side or the communication terminal as necessary. Stored in 61, the sender (user A) can determine whether the receiver (user B) saw the mail by referring to the reference record, the latest information can be determined by serial, and the correction can be made even after the transmission. .

Further, the dictionary conversion server 70 and the servers 10, 3
Address conversion dictionary database 7 for each 0
1, 17, 37 allows the user communication terminals 60, 61 to use an easy-to-remember name and an easy-to-convey name without using many long-named e-mail addresses, refer to the dictionary data, and convert to an appropriate e-mail address. Can send and receive.

Next, the operation will be described. The mail address of the route of the present invention is, for example, "siteX.c".
o. jp * userA ”(domain name * user name) and the virtual mail box 11a has a sub-mail address of" al ", the site name is" site ".
X. co. It will have a mail address of “jp * userA * al” (domain name * user name * box name). However, in consideration of the relationship with the conventional mail system, "userA@siteX.co.jp*al" (mail address * box name) can be used as the same with only a difference in description. In addition, in order to use properly according to the purpose, "siteX.co.jp * userA
A sub-address can be added as in “* al * 2001” (domain name * user name * box name Lv1 * box name Lv2).

In this way, the user A on the sending side having the root mail address "siteX.co.jp * userA" uses the communication terminal 60 to send the mail ID "sit".
eX. co. jp * userA * m284896277
"43435" mail to the root mail address "si
teY. co. The case of sending to the communication terminal 61 of the user B on the receiving side having “jp * userB” will be described as an example. It should be noted that the mail address of each of the virtual mailboxes 11b and 31a to be used by the user A is "siteX.c".
o. jp * userA * a2 ”, and user B is“ s
iteY. co. jp * userB * b1 ”.

User A uses the mail address "siteX.co.jp * userA *" of the virtual mail box 11b.
"a2" is created and registration permission for user B is set.
Email address of virtual mailbox 11b "site
X. co. jp * userA * a2 ”and the email address“ siteY.co.jp ”of the virtual mailbox 31a.
Prepare a registration form to set up a virtual mailbox that sends and receives mails through "* userB * b1" and a script to automatically set it, and notify user B of the mail address by some means (forms and scripts are prepared in advance. Create according to template or situation).

On the other hand, the user B is a virtual mailbox 31a (siteY.co.
jp * userB * b1) is created, registration permission for user A is set, and virtual mailbox 11b (sit)
eX. co. jp * userA * a2) according to the registration home provided for the mail address (siteY.
co. jp * userB * b1) to register.

Then, the user database 12 (siteX.co.jp * use) is set by the automatic setting script.
rA) and the user database 32 (siteY.co.
jp * userB) virtual mailbox setting information 1
The settings of Nos. 5 and 35 are written, and the mail can be transmitted and received.

Here, the virtual mailbox setting information 1
Reference numerals 5 and 35 are information for setting for each virtual mailbox, and include "owner name", "registration permission", "destination",
The information includes "incoming call permission", "forwarding destination", "relay", "relay permission", "password", and "encryption type / encryption key".

The name of the owner is literally entered in the "owner name" and is set for each virtual mailbox in order to correspond to various attributes. You can name it freely, but here,
The owner name of user A contains "user A * a2", and the owner name of user B contains "user B * b1".

Enter your e-mail address in "Registration permission"
Give permission to set up virtual mailbox (es). User A's virtual mailbox 11b (site
X. co. In jp * userA * a2), “site
Y. co. Permission to user B
The virtual mailbox to be connected to can be set, and similarly, in the virtual mailbox 31a of the user B "siteY.co.jp * userB * b1", "siteX.co.jp * userA" is permitted. Is set so that the virtual mailbox connected to the user B can be set. Therefore, the setting is performed by the automatic setting script.

[0026] The "destination" contains the mail address (a plurality of addresses) of the destination to be sent through this virtual mailbox, and the data is transmitted and received between the user A and the user B. Therefore, the destination of the user A is "siteY.co. .Jp * userB * b1 ”
Is entered and the transmission destination of the user B is "siteX.co.j".
"p * userA * a2" is included.

[0027] The "incoming call permission" contains the e-mail address (s) to which the incoming call is to be permitted.
iteY. co. jp * userB * b1 ”is entered, and“ siteX.co.jp * us ”is added to the incoming call permission of the user B.
erA * a2 ”is included.

The "transfer destination" contains the mail address of the transfer destination to be sent through this virtual mailbox (a plurality of addresses is possible), and since the user A and the user B do not need to transfer, it is blank.

"Relay" and "relay permission" respectively include a destination mail address and a permitted mail address (a plurality of addresses), and the transferred mail is transmitted from the standpoint of the transfer source. Reference is made, but since user A and user B are not in a relaying relationship, they are blank.

The "password" is a condition for giving permission regarding the creation and setting of the virtual mailbox, and is blank in the virtual mailboxes 11a and 11b of the user A and is not restricted by the password.

The name of the encryption method is entered in "encryption type" (default value is entered if not specified). In addition, a code for encryption and decryption is automatically generated and entered in the "encryption key", the user does not have to pay special attention, and the same value is set in the virtual mailbox to which the connection is established by registration. Copied and entered, user A and user B have the same "SS
"L3 / D2F1A0E9 ..." is included.

Next, the creation of a mail will be described. As for the outgoing mail, the outgoing mail is created for the virtual mailbox whose transmission and reception are established. User A is a virtual mailbox 11b (siteX.co.jp * userA * a
2) to the virtual mailbox 31a of user B
Create a mail addressed to (siteY.co.jp * userB * b1).

The created mail has the text, mail ID, serial, and the like in the distribution information 13 of the user database 12.
The password is recorded, and the index information 14b (siteX.co.jp * use) of the user database 12 is recorded.
rA * A2) contains the mail ID, serial, mail password, check code, subject, code, sender name, creation date,
The date of reception and the like are recorded.

Here, the "mail ID" is a code for extracting information, and is, for example, "siteX.co.j".
p * userA * m284589627783435 ”
In (domain name * user name * code), the “mail password” is a condition for taking out the mail of the corresponding mail ID, and both are automatically generated and used, and the user does not have to pay special attention.

The "subject" is the subject of the mail, and the "check code" is a code for determining whether or not the contents of the mail have been changed. For example, the code is a code created from a character code and the number of characters according to some rule. , It is possible to determine that the change has been made if it differs from the code created in the same way from the email comparing with the check code.

"Serial" increases the number when the mail is corrected, distinguishes the corrected mail from the previous mail, and the larger the number, the latest mail.

The "encryption" is performed in the virtual mailbox to which the connection is established, and even if the mail is read by some means, it cannot be decrypted unless it is the virtual mailbox having the key, and the contents are not understood. If protected and encrypted, for example, “1”, if not encrypted, leave blank
Since the mail of user A is not encrypted, it is blank.

Next, the transmission will be described. In the transmission, the index information of the mail ID is sent to the virtual mailbox of the transmission destination, and the user A sends the mail ID (si
teX. co. jp * userA * m28489627
732435) with the serial number of the text in the index information of user B's virtual mailbox 31a (site)
Y. co. jp * userB * b1).

Next, reception will be described. User B uses the index information received in the virtual mailbox 31a as the target information, that is, the mail ID is "siteX.c".
o. jp * userA * m2848962778343
The index information “5” is selected, the mail password is extracted from the index information, the ID and password authentication is obtained, and the distribution information 13 of the user database 12 of the user A who is the transmission source is referred to. At this time, the part related to authentication is automatically processed internally, so the user does not need to be aware.

Next, serial update and reference recording will be described. When referenced, the serial of the received index information is updated to the same as that of the transmission source. At this time, a log remains as a reference record at the transmission source, and therefore, it can be determined whether or not the mail is viewed. The serial number of the index of the user B is the same as that of the user A, and the log of the user A indicates that the user B has the mail ID (siteX.co.jp * u).
SerA * m28489627778435) remains a record.

The received mail can be left in the reception information 36 of the user database 32 of the user B, if necessary. However, the index information is 34a (site
Y. co. Since it can be referred to from jp * userB * b1) at any time, it is mainly used as a backup application.

Next, the correction after transmission will be described. To correct the mail after sending, create a new one with the same mail ID and a larger number than the serial before correction. Therefore, although there are a plurality of same mail IDs, the latest mail can be referred to by selecting one serial having the largest number.

Whether or not the correction has been made can be judged on the receiving side by comparing the serial on the receiving side with the serial on the transmitting side. For this reason, if it is necessary to immediately notice the correction, it is necessary to retransmit the correction. However, if it is not correct such as correction of a typographical error, nothing needs to be done after the correction.

Since the uncorrected mail remains unless it is intentionally deleted, it can be referenced unless it is deleted by the sender, and even if it is deleted, it can be referenced if it is saved as a backup on the receiving side. . Also, even if the sender has tampered with without updating the serial,
It can be checked using the check code on the receiving side.

Next, confirmation of whether or not the mail has been read will be described. By searching the log with the mail ID to be confirmed, it can be seen that if there is a record after the transmission date, it has already been read, and if there is no record, it has not been read.

In this way, the mail system according to the present invention can be conveniently used by setting it from various standpoints. For example, this mail system can be used in the following situations. Can be used correspondingly.

Therefore, first, the mailing list will be described. The issuer makes the permission to register the virtual mailbox setting information, for example, allow all to grant permission to all users so that they can freely register, and the email address of the user to be registered is sent by virtual transmission of the virtual mailbox setting information. Put in destination and transfer destination. Since the rejection can be controlled on the registered user side, the transmission can be controlled depending on the state on the user side. Therefore, a simple mailing list is possible only by setting.

A mailing list is made up of a group of three or more people, but even one person can use a plurality of attributes depending on his / her position, so it is worthwhile to use it only between two people. For example, when the user A receives some inquiry from the user B and answers depending on the situation (in this case, when he / she is out), if the position A is a company or home, and the position B is out, then the user A himself is Create a virtual mailbox (user B inquiry ML) for the mailing list, and for user "user A * user B inquiry ML", user A specifies "user A * stand A" and "user A (mobile) * stand B". User B registers "User B * Inquiry". Alternatively, the user A registers “user A * user B inquiry ML” in response to “user B * inquiry”.

[User A * User B Inquiry M]
The mail addressed to "L" is sent to all registered virtual mailboxes. For example, the mail sent from "User A (mobile phone) * Position B" to "User A * User B inquiry ML" is
"User A * Stand A", ("User A (mobile) * Stand B"), "User B * Inquiry". In other words, "User A * Stand A", "User A (mobile) * Stand B", "User B"
* Inquiry ”can be synchronized, and user B can also use the same mechanism.

Next, the mail magazine will be described.
The issuer makes registration permission of virtual mailbox setting information, for example, allow all to give permission to all users so that they can freely register, and the registered user's email address is sent to the virtual mailbox setting information by splitting. You can send an e-mail if you send it to all the recipients. Since the registered user can control the rejection, the transmission can be controlled according to the state on the user side. Therefore, it is possible to issue a simple mail magazine depending on the settings.

Next, the mail address conversion system will be described. This mail system uses many long sub-mail addresses, but when exchanging information with the first person, it is easier to convey the mail address and to reduce the trouble of inputting by the communication terminal to be used and the problem due to input mistakes. , In order to convey a sub-mail address, a short or easy-to-understand character string (including symbol) conversion key is distributed in place of a long mail address and is used for transmission. While converting the conversion key with a dictionary, It is a system that converts to a long email address.

More specifically, as described above, in FIG. 1, the servers 10 and 30 include the address conversion dictionary databases 17 and 37, and the address conversion dictionary databases 17 and 37 include the basic dictionary starting from the domain name. (Cache) 18, 38, user dictionaries 19 and 39 starting from user names, box dictionaries 20 and 40 starting from virtual mailbox names, and address conversion dictionary database of dictionary conversion server 70 managing basic dictionaries 18 and 38. 71 includes a basic dictionary 72, in which information for converting to a mail address is registered.

Since the mail address has a hierarchical structure, it can be classified for each hierarchy (generally, it becomes a domain, a user name, a box name), and when a high level is determined, the range of the next level can be taken. Is limited,
By extracting a part of the mail address corresponding to the conversion key registered in the dictionary as a candidate and replacing it, it is possible to convert efficiently.

The conversion of the mail address is performed by the mail client application of the communication terminal on each server 1.
The dictionary of the address conversion dictionary database 17, 37 distributed in 0, 30 is the basic dictionary (cache) 18, 3,
8, the user dictionaries 19 and 39, and the box dictionaries 20 and 40 are switched in this order and taken out, and converted while interacting.

For example, if the conversion key is "ABC ³ AJA", it can be divided into "ABC ³ ", "A", "J", and "A", and the site server can be determined by converting from the left. However, the dictionary of the address conversion dictionary databases 17 and 37 distributed in the respective servers 10 and 30 is converted using the basic dictionaries (caches) 18 and 38, the user dictionaries 19 and 39, and the box dictionaries 20 and 40 in this order. You can go.

As illustrated in FIG. 2, the target mail address is "abc.co.jp * userA * jo".
bs * a1 ”and the destination is“ ABC Corporation's customer a ”
1 ", the conversion key is" ABC ³ AJA ", and the input of the conversion key is" ABC AJA ", the connection server 1 of the communication terminal 60 (or 61) in the conversion of the first delimiter ABC.
0 (or 30) basic dictionary (cache) 18 (or 38), if there is no basic dictionary 7 of the conversion dictionary server 70
2 (FIG. 3), it becomes FIG. 4 (a), (b), (c). Then, the desired conversion candidate is selected from the displayed screens, for example, by switching the screen with the cursor key ← →, selecting the type, and by selecting the item with ↑ ↓ to confirm the conversion.

Note that " ³ " in "ABC ³ " indicates the number when the conversion candidate is divided by the minimum unit, and can be separated by "." In the domain. It works as a guide when converting, and conversion is possible by looking at each one without it.

Similarly, at the next delimiter, while selecting a conversion candidate and interacting with it, the target mail address "ab
c. co. jp * userA * jobs * a1 ”to determine the mail address (the conversion dictionary is a conversion dictionary that extracts conversion candidates from the user dictionary and box dictionary of the server determined in the first conversion).

Since a plurality of conversion keys can be registered,
Even if "12301 11 ² " or "ABC01 11 ² " is input, "abc.co.jp * userA * jobs * a"
It is also possible to convert to "1" and confirm the mail address. Further, if there are few conversion candidates, it can be confirmed even if a part of them is omitted. Therefore, “ABC 01” and “ABC 11 ² ”.
But it is okay.

As described above, since the unknown portion can be omitted, it also serves as a guide for the virtual mailbox, and in the conventional system, it is dangerous to inform the email address carelessly. Although it was not thought because it was, it is possible to positively inform the e-mail address in order to clearly know the e-mail address to be accepted or rejected depending on the use.

As can be seen from the example of the conversion candidates, the conversion key is divided into a plurality of parts, and each word has a large number of conversion candidates. Therefore, the conversion key can be shortened,
Input mistakes can be detected early, making accurate input easy. Also, having many conversion candidates is confusing,
It's annoying, but when it comes to communicating using words, it has a huge effect that is easy to understand and convey (for example, if you imagine a language that does not allow you to use the same name at all, Various problems such as not being able to attach and remember cannot be used at all). Even if the words used in everyday life have the same name, they can be judged according to their meanings and purposes, and are omitted. One-to-one conversion is easy to understand and fast, but it is effective only in a very limited range.The conversion key is an abbreviation intended to convey through words, and I do not know it, so I look up the dictionary and look it up. .

[0062]

As described above, according to the present invention, since the outgoing mail is stored at the sender for the purpose of exchanging information between attributes, control of proper use according to the purpose, correction after sending, and correction after sending You can check whether the email was read and improve the management function.

Further, according to the present invention, it is possible to suppress the spread of mail mixed with a virus, avoid spam mail (junk mail), make it difficult to fake the sender, and improve the security function.

Furthermore, by using the conversion dictionary, it is possible to convey without using many long mail addresses generated by properly using the conversion dictionary, and the effect of reducing the burden of transmission and input and the guidance of mail addresses. effective.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an exemplary embodiment of a distributed mail system targeting between attributes according to the present invention.

FIG. 2 is an explanatory diagram of a relationship among a mail address, a conversion key, and a conversion dictionary.

FIG. 3 is a diagram showing a basic dictionary in an address conversion dictionary database.

FIG. 4 is a diagram showing a display example of conversion candidates of the basic dictionary in FIG. (A) is a screen 1 of a display example. (B) is a screen 2 of a display example. (C) is a screen 3 of a display example.

[Explanation of symbols]

10, 30 server 11a, 11b, 31a, 31b, 31c virtual mailbox 12, 32 user database 13, 33 delivery information 14a, 14b, 34a, 34b, 34c index information 15, 35 virtual mailbox setting information 16, 36 reception information 17, 37, 71 Address conversion dictionary database 18, 38, 72 Basic dictionary 19, 39 User dictionary 20, 40 Box dictionary 50 Internet 60, 61 Communication terminal 70 Dictionary conversion server

Claims (2)

[Claims] 1. A user communication terminal connected to the Internet used for sending and receiving mail, and being connected to the Internet and interacting with the user communication terminal to send and receive mail, and to control mail information. The server includes a virtual mailbox for exchanging information only between users established according to usage, and a user database used by a user of the communication terminal, the user database transmitting Delivery information in which the email to be stored is stored, index information for extracting the delivery information, virtual mailbox setting information in which information about the virtual mailbox is recorded, and reception information in which the received email is stored. Including a virtual mailbox of the user database through the virtual mailbox. The index setting information is referred to, the index information is transmitted / received according to the setting, the delivery information of the user database of the sender is referred to retrieve the mail, and the mail is received by the user database of the receiver when necessary. Information or stored in a communication terminal, the sender can refer to the reference record to determine whether the recipient has viewed the mail, the serial information can be used to determine the latest information, and it is possible to correct even after transmission. A distributed mail system that targets multiple attributes. 2. A user communication terminal connected to the Internet used for sending and receiving mail, and being connected to the Internet and interacting with the user communication terminal to send and receive mail, and to control mail information. And a dictionary conversion server which is connected to the Internet and interacts with a user communication terminal to convert a character string (including symbols) used in place of a mail address into a mail address, wherein the dictionary conversion server is , Including an address conversion dictionary database having a basic dictionary, the server has a function of converting a character string used in place of an email address into an email address as in the dictionary conversion server, and includes a basic dictionary, a user dictionary, and a box dictionary. Between the address translation dictionary database that it has and the users established by use A virtual mailbox for exchanging information only, and a user database used by a user of the communication terminal, the user database including distribution information in which a mail to be transmitted is stored and an index for extracting the distribution information. Information, including virtual mailbox setting information in which information about the virtual mailbox is recorded, and reception information in which received mail is stored, by the address conversion dictionary database in each of the dictionary conversion server and the server, The user communication terminal does not use many long-named email addresses, but uses names that are easy to remember and convey, and refers to dictionary data to convert to an appropriate email address for sending and receiving emails. A distributed mail system for.