JP2010061476A - Electronic mail system, mail server, program for mail server, and information sharing method by use of e-mail - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic mail system capable of ensuring high degree of security while maintaining ease of simple operation being equal to transmission and reception of usual E-mail with accompanying file when sharing the file between users transmitting and receiving E-mail. <P>SOLUTION: The electronic mail system includes: a mail server 20 for extracting an attached file from the E-mail, storing the attached file in a file server 30, and transmitting the E-mail with path information of the attached file in the file server 30 and without the attached file to a destination when receiving the E-mail with the attached file from a transmitter's terminal unit used by a transmitter of the E-mail; and the file server 30 for storing the attached file and transmitting the attached file to a receiver's terminal when receiving access to the attached file from the receiver's terminal used by a receiver of the E-mail. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electronic mail system for sharing a file when an electronic mail including an attached file is transmitted and received.

Conventionally, when it is desired to share a file between users who send and receive e-mails, the following method is used.
First, there is a method of attaching a file to an e-mail and sending it to a user who wants to share it. This method requires the relatively few operations, can be performed easily and quickly, and is the most commonly performed method.

  Another method is to create a shared folder on the file server, upload a file to be shared, notify the user who wants to share the file storage location by e-mail, and allow the user to access the file. This method is widely used when managing data shared by a plurality of users or sharing a large capacity file.

However, in the method of sending an e-mail with a file attached, a copy of the file is sent to all recipients, so there is a problem that the risk of information leakage is relatively high, such as when the destination is wrong .
On the other hand, in the case of a method of sharing a file using a file server, it is possible to ensure high security by giving access authority to maintain security to the shared folder or shared file. Requires complicated setting operations and is difficult to carry out easily.

  Thus, when sharing files between users who send and receive e-mails, it is difficult to achieve robust security while maintaining the same operability as normal sending and receiving e-mails with attached files. It was.

Here, as a technology related to information sharing using electronic mail, a document management system described in Patent Document 1, a document file management system described in Patent Document 2, and an inter-group information sharing described in Patent Document 3 Name the system.
According to the document management system described in Patent Document 1, in a process in which emails for notifying the existence of a document are transferred in a chained manner, all parties who need the document can access the document. Access rights are set automatically.
For this reason, it is not necessary for the user to set an access authority, and operability when accessing a document can be improved.

Further, according to the document file management system described in Patent Document 2, an e-mail recipient corresponding to the transmission destination information entered in the e-mail destination column, CC column, and BCC column where a personal document file can be disclosed is sent to the e-mail recipient. On the other hand, it is possible to automatically set an appropriate access right according to the recipient.
Therefore, the user does not need to perform a special setting operation to set the access authority, and convenience can be improved.

  In addition, the inter-group information sharing system described in Patent Document 3 shares information between users constituting a group, and the user selects members constituting the group when creating the group. Yes. In addition, when adding a member, an invitation mail is transmitted to a partner to be added, and the partner who has received the participation consent mail is added.

JP 2008-040830 A JP 2006-155041 A JP 2005-267266 A

However, in the document management system described in Patent Document 1 and the document file management system described in Patent Document 2, if a mail is transferred to a third party due to an erroneous mail transmission or the like, inappropriate access is made to that person. There was a problem that permission was given.
Further, the inter-group information sharing system described in Patent Document 3 has a problem that a complicated operation is required to generate a group for sharing a file or add a member.

  The present invention has been considered in view of the above circumstances, and maintains an easy operability equivalent to transmission / reception of an e-mail with an attached file, and can ensure high security, an e-mail system, a mail server, and an e-mail An object is to provide a server program and an information sharing method using electronic mail.

  In order to achieve the above object, when an e-mail system of the present invention receives an e-mail with an attached file from a sender terminal used by the e-mail sender, the e-mail system extracts the attached file from the e-mail and attaches it. The file is stored in the file server, the mail server that includes the path information of the attached file in the file server, and the email without the attached file is sent to the destination, and the attached file is stored and used by the recipient of the email And a file server that receives the access to the attached file from the recipient terminal and transmits the attached file to the recipient terminal.

  The mail server of the present invention also extracts a mailer communication unit that receives an email with an attached file from a sender terminal used by the sender of the email, and extracts the attached file by inputting the email from the mailer communication unit. A mail editing unit that returns the attached file to the mailer communication unit, and a file server communication unit that transmits and stores the attached file to the file server and receives path information from the file server to the attached file in the file server. The mailer communication unit includes an attached file path information in the file server and transmits an e-mail from which the attached file is removed to a destination.

  Also, the mail server program of the present invention inputs a mail from the mailer communication unit that receives the email with the attached file from the sender terminal used by the sender of the email, and the mailer communication unit. To extract the attached file, return the attached file to the mailer communication unit, send the attached file to the file server for storage, and receive the path information from the file server to the attached file on the file server. The mail server communication unit functions as a file server communication unit, and transmits an e-mail including the path information of the attached file in the file server and excluding the attached file to the destination.

  Further, in the information sharing method using an electronic mail according to the present invention, when the mail server receives an electronic mail with an attached file from a sender terminal used by the sender of the electronic mail, the attached file is extracted from the electronic mail. Extract and store the attached file in the file server, send the e-mail including the path information of the attached file in the file server, with the attached file removed, to the destination, and the file server stores the attached file and sends the e-mail This is a method for receiving an access to an attached file from a recipient terminal used by a recipient of the recipient and transmitting the attached file to the recipient terminal.

  According to the present invention, when sharing an attached file between users who send and receive e-mails, it is possible to ensure high security while maintaining simple operability equivalent to sending and receiving e-mails with attached files. It becomes.

Hereinafter, preferred embodiments of an electronic mail system according to the present invention will be described with reference to the drawings.
Note that the electronic mail system of the present invention shown in the following embodiments is operated by a computer controlled by a program. The CPU of the computer sends a command to each component of the computer based on the program, and performs predetermined processing necessary for the operation of the mail server, for example, extraction processing of attached files, creation processing of a new group, to a shared file Process to attach the path information to the e-mail. Thus, each process and operation in the electronic mail system of the present invention can be realized by specific means in which the program and the computer cooperate.

The program is stored in advance in a recording medium such as a ROM and a RAM, and is executed by causing the computer to read the program from a recording medium mounted on the computer. For example, the program may be read by the computer via a communication line.
Further, the recording medium for storing the program can be constituted by, for example, a semiconductor memory, a magnetic disk, an optical disk, or any other recording means that can be read by any computer.

[First embodiment]
First, the structure of 1st embodiment of this invention is demonstrated with reference to FIGS. 1-4. FIG. 1 is a block diagram showing the configuration of the electronic mail system of this embodiment, and FIG. 2 is a block diagram showing the detailed configuration of the system. 3 and 4 are diagrams showing the data structures of the group information storage unit and the file management unit in the electronic mail system of this embodiment, respectively.

  As shown in FIG. 1, the electronic mail system of this embodiment includes a client 10 (10a, 10b, 10c), a mail server 20, and a file server 30, which are mutually connected by an IP (Internet Protocol) network 40. It is connected to the.

[Client 10]
The client 10 is an information processing apparatus such as a personal computer or a mobile phone used by a user, and can share information by sending and receiving electronic mails to each other.
As shown in FIG. 2, the client 10 includes a mailer 11 that communicates with the mail server 20 and transmits and receives electronic mail.

[Mail server 20]
The mail server 20 is an information processing apparatus that centrally manages electronic mails transmitted and received between the clients 10, and as shown in FIG. 2, a mailer communication unit 21, a mail editing unit 22, a file server communication unit 23, A mail data storage unit 24, a group information storage unit 25, and a mail grouping unit 26 are provided.

The mailer communication unit 21 communicates with the client 10 to send and receive electronic mail.
In addition, the mailer 11 in the client 10 causes the mailer communication unit 21 to transmit the group information stored in the group information storage unit 25 to the client 10 so that the group can be selected when sending an e-mail. Can do.
At this time, it is preferable to transmit to each client 10 group information in which the user of the client 10 is a group member.

When the mailer communication unit 21 receives an electronic mail with an attached file from the client 10, the mailer communication unit 21 outputs it to the mail editing unit 22. Then, the attached file extracted from the e-mail by the mail editing unit 22 is input and output to the file server communication unit 23.
In addition, the mailer communication unit 21 includes an e-mail title, recipient identification information (recipient name, destination address, etc.), group identification information (group number, group name, etc.), mail text, sender identification information ( Information such as a sender name, a sender address, and the like, and a transmission date and time are stored in the mail data storage unit 24.

  Further, when a group is designated when the mailer communication unit 21 receives an email from the client 10, the mailer communication unit 21 searches the group information storage unit 25 based on the identification information of the designated group, and Check whether the group information is already stored.

If the group information of the group is already stored, the mailer communication unit 21 acquires this group information and outputs it to the file server communication unit 23.
In the group information, when the sender is not included in the group members, the group information in the group information storage unit 25 can be updated including the sender.

  Further, when a group is not specified when the mailer communication unit 21 receives an email from the client 10, the mailer communication unit 21 creates a new group based on the received email title, recipient identification information, and sender identification information. And the obtained group information can be registered in the group information storage unit 25.

  If no group is specified, the group information storage unit 25 is searched using the title as the group name, the recipient identification information and the sender identification information as member information, and if the corresponding group information exists, the mailer The communication unit 21 may acquire the group information and output the group information to the file server communication unit 23.

When the e-mail with attached file is input from the mailer communication unit 21, the mail editing unit 22 extracts the attached file from the e-mail and returns the attached file to the mailer communication unit 21.
The file server communication unit 23 transmits the attached file of the email input from the mailer communication unit 21 and the group information of the specified group to the file server 30. This group information is used in the file server 30 to set the access authority to the attached file.

  The mail data storage unit 24 is a storage unit that stores information on electronic mail transmitted and received between the clients 10 and stores information other than the attached file. For example, as described above, e-mail title, recipient identification information (recipient name, destination address, etc.), group identification information (group number, group name, etc.), mail text, sender identification information (transmission) (Name, sender address, etc.), transmission date and time, etc. can be stored.

The group information storage unit 25 is a storage unit that stores group information. For example, as shown in FIG. 3, the group information storage unit 25 can store a group number, a group name, a group member name (member information), authority information, and the like.
When a new group is created by the mailer communication unit 21, as a default setting of the authority information, group information that can be read / written by the sender and can only be read by the receiver is created, and a group information storage unit 25 can be stored. In the group information, the authority information can be held for each attached file.

The mail grouping means 26 can create group information based on the e-mail title, recipient identification information, and sender identification information stored in the mail data storage unit 24.
Specifically, the mail grouping means 26 groups, for example, e-mails that have the same configuration of the person including the sender and the recipient and share the whole or part of the e-mail title. It is possible to create group information by using a common part as a group name and automatically generating a group number by serial number.
In addition, among the extracted e-mails, the sender of the e-mail with the oldest date can be set as the group owner.

  Further, the mail grouping means 26 automatically generates authority information for the group. At this time, as in the case of creating new group information by the mailer communication unit 21, by default, the sender can read and write, and the receiver can only read.

  For example, “Sender A, Recipients B, C, D”, E-mail with attachment of title E, and “Sender B, Recipients A, C, D, Title Re: E Is stored in the mail data storage unit 24, group information with “A”, “B”, “C” and “D” as the group member and the group name as “E” is created. The Also, “Mr. A” who is the sender of the attached file is made the group owner, and the authority information is set to enable both “read / write (read / write)”. “San” can be made a group member and the authority information can be set to “read” only.

[File Server 30]
The file server 30 is an information processing apparatus that manages an attached file of an e-mail, and includes a mail server communication unit 31 and a file management unit 32 as shown in FIG.
The mail server communication unit 31 receives the attached file and the corresponding group information from the file server communication unit 23 in the mail server 20.
The file management unit 32 manages reading and writing of shared folders and shared files accessed from the client 10.

  Next, a processing procedure in the electronic mail system according to the present embodiment will be described with reference to FIGS. FIG. 5 is a view showing a mail transmission screen in the electronic mail system of this embodiment. 6 and 7 are a flowchart showing the processing procedure of the mail server and the processing procedure of the file server in the system respectively. FIG. 8 is a view showing a mail reception screen in the system. FIG. 9 is a diagram showing security maintenance at the time of erroneous mail transmission by the system.

<1. Sending email to the mail server>
First, the sender of the e-mail displays a mail transmission screen as shown in FIG. 5 by the mailer 11 in the client 10 as the sender terminal, and displays the title, destination, group, attached file, mail text, etc. input. In the screen example shown in the figure, an existing group can be specified by a drop-down list, and is not specified when the group is not an existing one.
The existing group information can be received in advance and / or at a predetermined timing when the mailer 11 receives mail from the mail server 20 and can be stored in the mailer 11.

  Then, the mailer 11 transmits an email with an attached file to the mail server 20. When a group is specified on the mail transmission screen, the mailer 11 transmits the attached file-attached e-mail including the identification information of the group to the mail server 20.

According to such a mail transmission screen, it is possible to make it appear to the sender as if a normal electronic mail with an attached file was transmitted to the destination.
However, according to the e-mail system of the present embodiment, an e-mail with path information to the attached file is actually transmitted to the destination, and the attached file is stored in the file server 30 and has access authority. Security management is designed to be accessible only.

<2. Extraction of attached file and registration to file server>
Next, the operation of the mail server 20 will be described with reference to FIG.
First, the mailer communication unit 21 in the mail server 20 receives an electronic mail from the client 10 (step 10), and determines whether or not an attached file is included in the received electronic mail (step 11).

If the attached file is not included (No in Step 11), the mailer communication unit 21 transmits this e-mail to the destination (Step 17).
When the attached file is included (Yes in step 11), the mailer communication unit 21 outputs the received electronic mail to the mail editing unit 22.

The mail editing unit 22 extracts the attached file from the electronic mail (step 12), and returns the attached file to the mailer communication unit 21.
Next, the mailer communication unit 21 checks whether or not a group is specified in the received electronic mail (step 13).

If the group is not specified (No in step 13), that is, if the received electronic mail does not include group identification information, the mailer communication unit 21 creates new group information (step 14).
At this time, the new group information is converted into the title of the e-mail, the identification information of the recipient, and the identification information of the sender by the mailer communication unit 21 in the same manner as described above in the explanation of the function of the mail grouping means 26. Can be created based on. Then, the mailer communication unit 21 stores the created group information in the group information storage unit 25.

On the other hand, when a group is designated (Yes in step 13) or after a new group is created, the mailer communication unit 21 uses the identification information of the designated group to send the corresponding group information to the group information storage unit 25. Get from.
Next, the mailer communication unit 21 outputs a shared file registration request including the acquired group information and attached file to the file server communication unit 23, and the file server 30 registers the shared file (step 15).

<3. Registering shared files with a file server>
Next, registration of a shared file by the file server 30 will be described with reference to FIG.
First, the mail server communication unit 31 in the file server 30 receives the shared file registration request from the mail server 20 (step 30), and the shared folder corresponding to the group information included in the registration request is stored in the file management unit 32. It is determined whether or not it exists (step 31).

If the shared folder corresponding to the group information does not exist in the file management unit 32 (No in step 31), the mail server communication unit 31 creates a new shared folder corresponding to the group information (step 32). At this time, if the registration request includes group information as shown in FIG. 3, the mail server communication unit 31 uses, for example, the group name in the group information to indicate “A product development group” in the file management unit 32. Can be created.
If the shared folder corresponding to the group information exists in the file management unit 32 (Yes in step 31), step 32 is omitted.

Then, the mail server communication unit 31 registers the shared file in the file management unit 32 by storing the shared file received from the mail server 20 in the shared folder corresponding to the group information (step 33).
Further, the mail server communication unit 31 sets the access authority for the shared folder and the shared file using the authority information included in the group information (step 34).
As a result, for example, as shown in FIG. 4, a person who can access the attached file as the shared file and an operation content allowed for each person are set.

  Next, the mail server communication unit 31 returns the path information (link) to the shared file to the file server communication unit 23 in the mail server 20 (step 35). In the mail server 20, this path information is output from the file server communication unit 23 to the mailer communication unit 21.

<4. Attaching path information and sending mail>
Next, in step 16 of FIG. 6, the mailer communication unit 21 in the mail server 20 outputs the path information to the shared file acquired from the file server 30 to the mail editing unit 22.
The mail editing unit 22 attaches the path information of the shared file to the mail body and returns it to the mailer communication unit 21.
In this way, the mailer communication unit 21 removes the attached file and transmits an e-mail including the path information of the attached file in the file server 30 to the destination (step 17).

<5. Receive e-mail>
The recipient of the email receives the email by the mailer 11 in the client 10 as the recipient terminal. At this time, the recipient terminal can display a screen as shown in FIG.

Here, the attached file of the e-mail is stored in the file management unit 32 in the file server 30 and is acquired by the mailer 11 of the recipient terminal accessing the file server 30.
However, according to the electronic mail system of the present embodiment, as shown in FIG. 8, the attached file is displayed in the same manner as when a normal attached file is received.

  Then, the user performs a file reference operation such as pressing the attached file name on the receiver terminal, and based on the path information embedded in the display portion of the attached file name, the file management unit 32 in the file server 30 The attached file can be received.

That is, as shown in the figure, the receiver terminal displays the attached file as received, and embeds the path information to the attached file as attribute information of the object that displays the attached file, and the object is referred to. The recipient terminal can access the attached file in the file server and receive the attached file.
For this reason, it is possible for the user to read the attached file by performing the same normal simple operation as when the attached file is received by the recipient terminal.

According to the e-mail system of the present embodiment, as shown in FIG. 9, when users belonging to the same group (Mr. A and B in the same figure) send and receive e-mails with attached files, these users , Access to shared folders and attached files in the group is possible.
On the other hand, even if a user who does not belong to the same group (Mr. X in the figure) receives an email with an attached file by mistake, the authority information for accessing the shared folder and attached file in the group is the file for that user. Since it is not registered in the management unit 32, access is denied.
As a result, even if an e-mail with an attached file is sent to the wrong user due to an incorrect e-mail transmission, the user cannot refer to the attached file, and an e-mail system with excellent security can be realized. It has become.

<6. Browse attachments>
Next, with reference to FIG. 10, a processing procedure for acquiring an attached file from the file server 30 by the recipient terminal will be described.
The recipient of the e-mail performs a file reference operation, for example, by pressing the display portion of the attached file from the mail reception screen as shown in FIG. 8 displayed on the recipient terminal, and passes through the mail server 20. The attached file can be received from the file server 30 without any problem.

At this time, the recipient terminal transmits the mail recipient information including the recipient name and group information and the attached file name to the file server 30.
Then, the mail server communication unit 31 in the file server 30 receives these (step 50), and executes an authentication process to determine whether the recipient has the authority to access the attached file (step 51).

  At this time, the mail server communication unit 31 acquires authority information corresponding to the attached file from the file management unit 32. Then, the authentication process is executed by determining whether or not the recipient authority information exists. As for the file operation of each recipient, only the “read” or “write” operation set in the authority information is permitted.

If the authentication is successful, the mail server communication unit 31 permits file access from the recipient terminal (step 52). That is, the transmission of the attached file from the file management unit 32 to the recipient terminal is permitted, and the operation set in the authority information is permitted.
On the other hand, if the authentication fails, the mail server communication unit 31 rejects file access from the recipient terminal (step 53).

  As described above, according to the electronic mail system, the mail server, the mail server program, and the information sharing method using electronic mail according to the present embodiment, when an electronic mail with an attached file is transmitted, An attached file can be extracted from the mail, stored in the file server and managed, and the path information to the attached file in the file server can be included in the e-mail and transmitted to the destination.

  The sender can then appear to send the email and the attached file to the destination, just like sending an email with the attached file to the destination. You can make the file appear to have been received.

Further, according to the electronic mail system or the like of the present embodiment, it is possible to cause the file server to create a shared folder and a shared file based on the group information designated by the sender, and to automatically set the access authority.
Furthermore, when group information is not specified by the sender, the mail server creates new group information using the title of the email, the identification information of the recipient, and the identification information of the sender, and this file server It is possible to create a shared folder and a shared file based on the new group information, and to automatically set access authority.

  As described above, according to this embodiment, it is possible to store the attached file in the file server and to ensure high security only by performing an operation of sending and receiving a normal email with the attached file. It is possible to realize both excellent convenience and safety in sharing information.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 1 is a block diagram showing the configuration of the electronic mail system according to this embodiment.
This embodiment is different from the first embodiment in that the functions of the mail server 20 and the file server 30 in the first embodiment are stored in one groupware server 50. About another point, it is the same as that of 1st embodiment.

That is, in the electronic mail system of the present embodiment, as shown in the figure, the mailer communication unit 21, the mail editing unit 22, and the file server communication unit 23 in the mail server 20 of the first embodiment include the groupware server 50. It is provided in the mail server function execution 20a.
Further, the mail server communication unit 31 and the file management unit 32 in the file server 30 of the first embodiment are provided in the file server function execution unit 30 a of the groupware server 50.

  In the present embodiment, with such a configuration, the same processing as in the electronic mail system of the first exemplary embodiment can be executed by one groupware server 50, which is equivalent to transmission / reception of a normal email with an attached file. It is possible to ensure high security while maintaining simple operability.

It goes without saying that the present invention is not limited to the above embodiment, and that various modifications can be made within the scope of the present invention.
For example, although three clients 10 are shown in the above embodiment, the present invention is not limited to this, and it is sufficient if there are two or more clients 10 used as a sender terminal and a receiver terminal. Further, the mail server 20 and the file server 30 can be appropriately changed, for example, configured by a plurality of units.

  The present invention can be preferably used when various information such as documents and programs are shared and managed in a group using groupware.

It is a block diagram which shows the structure of the electronic mail system of 1st embodiment of this invention. It is a block diagram which shows the detailed structure of the electronic mail system of 1st embodiment of this invention. It is a figure which shows the data structure of the group information storage part in the electronic mail system of 1st embodiment of this invention. It is a figure which shows the data structure of the file management part in the electronic mail system of 1st embodiment of this invention. It is a figure which shows the mail transmission screen in the electronic mail system of 1st embodiment of this invention. It is a flowchart which shows the process sequence of the mail server in the electronic mail system of 1st embodiment of this invention. It is a flowchart which shows the process sequence of the file server in the electronic mail system of 1st embodiment of this invention. It is a figure which shows the mail reception screen in the electronic mail system of 1st embodiment of this invention. It is a figure which shows the security maintenance at the time of the mail mistransmission by the electronic mail system of 1st embodiment of this invention. It is a flowchart which shows the authentication processing procedure in the electronic mail system of 1st embodiment of this invention. It is a block diagram which shows the structure of the electronic mail system of 2nd embodiment of this invention.

Explanation of symbols

10 (10a, 10b, 10c) Client 11 Mailer 20 Mail server 20a Mail server function execution unit 21 Mailer communication unit 22 Mail editing unit 23 File server communication unit 24 Mail data storage unit 25 Group information storage unit 26 Mail grouping means 30 File Server 30a File server function execution unit 31 Mail server communication unit 32 File management unit 40 IP network 50 Groupware server

Claims (20)

When an email with an attached file is received from a sender terminal used by the sender of the email, the attached file is extracted from the email, and the attached file is stored in a file server. A mail server that includes the path information of the attached file and that sends the e-mail from which the attached file has been removed to a destination;
The file server for storing the attached file, receiving access to the attached file from a recipient terminal used by a recipient of the e-mail, and transmitting the attached file to the recipient terminal. E-mail system characterized by When the mail server receives an e-mail with an attached file from the sender terminal, the e-mail confirms whether or not the group identification information is included in the e-mail. Generating group information including the identification information of the group and the member information using the identification information of the sender and the identification information of the recipient as member information, and creating the group information together with the attached file. Send to the file server,
When the file server stores the attached file transmitted from the mail server together with the corresponding group information, and receives access to the attached file from the recipient terminal, the recipient identification information and the attached file name If the received recipient identification information is included in the group information stored in association with the received attached file name, access is permitted, otherwise access is denied. The electronic mail system according to claim 1, wherein: For each group, the mail server includes a group information storage unit that stores group identification information and information of members constituting the group. When the mail server receives an email with an attached file from the sender terminal, Check whether the group identification information is included in the mail. If the group identification information is not included, the group identification information is generated, and the sender identification information and recipient identification of the e-mail are generated. When group information is created as member information and stored in the group information storage unit, and group identification information is included, but the group identification information is not stored in the group information storage unit, Create group information that includes group identification information, identification information of the sender of the e-mail and identification information of the recipient as member information The group information stored in the storage unit, the electronic mail system according to claim 1 or 2, wherein together with said attachment, the group information created and transmits to the file server Te. The mail server includes mail data storage means for storing mail data including the title of the mail, identification information of the sender of the email, identification information of the recipient, and mail text, and is stored in the mail data storage means. Based on the mail title, the corresponding group identification information is generated, and the group identification information including the group identification information and the member information is created using the identification information of the sender of the email and the identification information of the receiver as member information. The electronic mail system according to claim 3, wherein the electronic mail system is stored in the group information storage unit. The group information includes authority information indicating whether the recipient can only read or read / write the attached file,
When the file server permits access from the recipient terminal to the attached file, the authority corresponding to the received recipient identification information in the group information stored in association with the received attached file name The electronic mail system according to claim 2, wherein only an operation on the attached file indicated in the information is permitted. The recipient terminal used by the recipient of the e-mail displays that the attached file has been received, and the path information to the attached file is embedded as attribute information of the object that displays the attached file, and the object The e-mail system according to claim 1, wherein when the user performs a reference operation, the recipient terminal accesses the attached file in the file server and receives the attached file. . A mailer communication unit that receives an email with an attached file from a sender terminal used by the sender of the email;
An email editing unit that extracts the attached file by inputting the electronic mail from the mailer communication unit, and returns the attached file to the mailer communication unit;
A file server communication unit that transmits and stores the attached file to the file server, and receives path information from the file server to the attached file in the file server, and
The mailer communication unit is
The mail server including the path information of the attached file in the file server and transmitting the electronic mail from which the attached file is removed to a destination. When the mailer communication unit receives an e-mail with an attached file from the sender terminal, the e-mail confirms whether or not the group identification information is included in the e-mail. Generating group information including the identification information of the group and the member information, using the identification information of the sender of the email and the identification information of the receiver as member information,
The mail server according to claim 7, wherein the file server communication unit transmits the created group information together with the attached file to the file server. The mail server according to claim 7 or 8, comprising a group information storage unit for storing group identification information and member information constituting the group for each group,
When the mailer communication unit receives an e-mail with an attached file from the sender terminal, the e-mail confirms whether or not the group identification information is included, and the group identification information is not included. Generating group identification information, creating group information using the identification information of the sender of the e-mail and the identification information of the recipient as member information, and storing the group information in the group information storage unit, including the group identification information However, if the identification information of the group is not stored in the group information storage unit, the group information includes identification information of the group, identification information of the sender of the e-mail, and identification information of the recipient as member information. Information is created and stored in the group information storage unit,
The mail server, wherein the file server communication unit transmits the created group information together with the attached file to the file server. Mail data storage means for storing mail data including the title of the mail, the identification information of the sender of the email, the identification information of the recipient, and the mail text;
Based on the title of the mail stored in the mail data storage means, the corresponding group identification information is generated, the identification information of the sender and the identification information of the e-mail are used as member information, and the group identification information and The mail server according to claim 9, further comprising mail grouping means for creating group information including the member information and storing the group information in the group information storage unit. Mail server
A mailer communication unit that receives an email with an attachment from a sender terminal used by the sender of the email,
The e-mail is input from the mailer communication unit to extract the attached file, and an e-mail editing unit that returns the attached file to the mailer communication unit; and
Sending and storing the attached file to the file server, causing the file server to function as a file server communication unit that receives path information from the file server to the attached file in the file server;
In the mailer communication unit,
A mail server program for executing transmission of the e-mail including the path information of the attached file in the file server and excluding the attached file to a destination. When the e-mail with the attached file is received from the sender terminal, the mailer communication unit checks whether or not the group identification information is included in the e-mail. Generating identification information, using the identification information of the sender of the e-mail and the identification information of the recipient as member information, creating the group information including the identification information of the group and the member information,
The mail server program according to claim 11, for causing the file server communication unit to transmit the created group information to the file server together with the attached file. The mail server,
For each group, function as a group information storage unit that stores group identification information and member information constituting the group,
When an e-mail with an attached file is transmitted from the sender terminal to the mailer communication unit, the e-mail confirms whether or not the group identification information is included, and the group identification information is included. If not, group identification information is generated, group information is created using the identification information of the sender of the email and the identification information of the recipient as member information, and stored in the group information storage unit. If the group identification information is not stored in the group information storage unit, the group identification information, the identification information of the sender of the e-mail, and the identification information of the recipient are member information. Group information to be created and stored in the group information storage unit,
The mail server program according to claim 11 or 12, for causing the file server communication unit to transmit the created group information to the file server together with the attached file. The mail server,
A mail data storage means for storing mail title, mail sender identification information, recipient identification information, mail data including the mail text, and
Based on the title of the mail stored in the mail data storage means, the corresponding group identification information is generated, the identification information of the sender and the identification information of the e-mail are used as member information, and the group identification information and 14. The server program according to claim 13, wherein the server server program functions as mail grouping means for creating group information including the member information and storing the group information in the group information storage unit. When the mail server receives an email with an attached file from the sender terminal used by the sender of the email, the attached file is extracted from the email, and the attached file is stored in the file server. Including the path information of the attached file in a file server, and sending the e-mail from which the attached file has been removed to a destination;
The file server stores the attachment file, receives access to the attachment file from a recipient terminal used by a recipient of the e-mail, and transmits the attachment file to the recipient terminal. Information sharing method using e-mail. When the mail server receives an e-mail with an attached file from the sender terminal, the e-mail confirms whether or not the group identification information is included in the e-mail. Generating group information including the identification information of the group and the member information using the identification information of the sender and the identification information of the recipient as member information, and creating the group information together with the attached file. Send to the file server,
When the file server stores the attached file transmitted from the mail server together with the corresponding group information, and receives access to the attached file from the recipient terminal, the recipient identification information and the attached file name If the received recipient identification information is included in the group information stored in association with the received attached file name, access is permitted, otherwise access is denied. The information sharing method using electronic mail according to claim 15. The mail server is provided with a group information storage unit for storing group identification information and member information constituting the group for each group.
When the mail server receives an email with an attached file from the sender terminal, it checks whether or not the group identification information is included in the email, and if the group identification information is not included, Group identification information is generated, group information is created using the identification information of the sender of the email and the identification information of the recipient as member information, and stored in the group information storage unit. If the group identification information is not stored in the group information storage unit, the group information includes the group identification information, the identification information of the sender of the e-mail, and the identification information of the recipient as member information. Is created and stored in the group information storage unit, and the created group information is sent to the file server together with the attached file. Information sharing method using an e-mail of claim 15 or 16, wherein that. The mail server is provided with mail data storage means for storing mail data including the title of the mail, the identification information of the sender of the email, the identification information of the recipient, and the mail text,
The mail server generates corresponding group identification information based on the mail title stored in the mail data storage means, and uses the identification information of the sender of the email and the identification information of the receiver as member information. 18. The information sharing method using electronic mail according to claim 17, wherein group information including group identification information and member information is created and stored in the group information storage unit. The group information includes authority information indicating whether the recipient can only read or read / write the attached file,
When the file server permits access from the recipient terminal to the attached file, the authority corresponding to the received recipient identification information in the group information stored in association with the received attached file name The information sharing method using electronic mail according to claim 16, wherein only an operation to an attached file indicated in the information is permitted. The recipient terminal used by the recipient of the e-mail displays the attached file as received, and the path information to the attached file is embedded as attribute information of the object that displays the attached file, The electronic mail according to any one of claims 15 to 19, wherein when the object is referred to, the recipient terminal accesses the attached file in the file server and receives the attached file. Information sharing method.

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