JPH1165961A - Electronic mail system, client and server - Google Patents

Abstract

PROBLEM TO BE SOLVED: To freely and easily set the retransmission parameter of every mail on the side of a user in an electronic mail system having the retransmitting function of mail. SOLUTION: At a client 1, the user sets the parameter of a retransmitting method for the unit of mail through a retransmission parameter setting means 1a. Then, a mail transmitting means 1b transmits the mail, to which the set parameter is added as one of attribute data, to the side of a server 2. The retransmission parameter of this once transmitted mail can be changed by a parameter changing means 1c, and the changed parameter is transmitted to the side of the server 2 by a changed parameter transmitting means 1d. On the side of the server 2, corresponding to a command from a distribution managing means 2b, a distributing means 2c distributes the mail. When the mail is not accepted at the distribution destination because of any reason after distribution, according to retransmission time or number of times for retransmission set for every mail, the retransmitting processing of every mail is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic mail system, a client, and a server for sending and receiving mail via a server, and more particularly to an electronic mail system, a client, and a server having a mail resending function.

[0002]

2. Description of the Related Art In recent years, electronic mail has become widespread, its use has been diversified, and an environment for exchanging mail of various contents has been set. However, even if a mail is sent unilaterally, it is not always guaranteed that the mail is received or read at the recipient. For this reason, conventionally, when a mail is not received, a device such as automatically repeating retransmission has been devised.

[0003] In addition, in order to cope with the diversification of electronic mails, various methods have been devised for mail transmission methods. For example, in Japanese Patent Application Laid-Open No. H8-314827, the importance of an e-mail is determined from the attribute of the e-mail, and a destination is selected and transferred automatically based on the importance.

[0004] Further, as disclosed in Japanese Patent Application Laid-Open No. 8-186593, the transfer efficiency is improved by resending the mail when it is detected that the terminal to which the mail has been sent is ready to receive mail. There is something.

Further, as disclosed in Japanese Patent Application Laid-Open No. Hei 5-110598, when an e-mail with a high degree of urgency becomes impossible to relay, this is immediately notified to the sender.

[0006]

However, in such a conventional technique, the parameters of the number of retransmissions of mail and the retransmission interval are set for each user or each system. For this reason, even if it is desired to change the resending method for each mail, it is necessary to change the setting of the electronic mail system for each user or for each system, which is troublesome.

Conventionally, it has not been possible to change the retransmission method after sending a mail. Thus, for example,
If you find that something you send as a regular email is urgent later, you'll need to change the way you send it and resend it with the same content,
There was a problem that two mails of the same content would arrive.

The present invention has been made in view of the above points, and provides an electronic mail system, a client, and a server in which a user can freely and easily set retransmission parameters of each mail. The purpose is to:

Another object of the present invention is to make it possible to change retransmission parameters of a mail after transmission.

[0010]

According to the present invention, in order to solve the above-mentioned problems, in an electronic mail system having a mail re-sending function, a re-sending method in which a parameter of the re-sending method can be set for each mail on a client. Parameter setting means, mail sending means for sending a mail to which the set parameters are added as one of attribute data to a server, and mail managing means for storing and managing the sent mail on the server side A distribution management unit that performs distribution management of the mail based on the attribute data added to the transmitted mail, a distribution execution unit that distributes the mail in response to a command from the distribution management unit, An e-mail system is provided.

In such an electronic mail system, the retransmission parameter setting means allows the user to set a parameter of a retransmission method for each mail on the client. Then, the mail transmitting means transmits the mail to which the set parameter is added as one of the attribute data to the server side.

On the server side, the mail management means stores and manages the transmitted mail, while the distribution management means
The distribution management of the mail is performed based on the attribute data added to the transmitted mail. Then, the distribution execution unit distributes the mail according to a command from the distribution management unit. As a result, after the distribution, if the mail is not accepted at the distribution destination for some reason, each mail is subjected to retransmission processing according to the retransmission time and the number of retransmissions set for each mail.

Further, in the present invention, parameter changing means for changing a parameter for resending the mail already transmitted on the client, and changing parameter transmitting means for transmitting the changed parameter to the server. Attribute changing means for changing the retransmission parameter of the attribute data managed by the distribution management means to the changed content, by providing a retransmission time and retransmission interval of already transmitted mail. Can be changed.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the concept of the function of the electronic mail system of the present invention. In the client 1, the user sets a parameter of a retransmission method for each mail by the retransmission parameter setting means 1a. And
The mail transmitting unit 1b transmits the mail to which the set parameter is added as one of the attribute data to the server 2. The parameters for resending this once sent email are
The parameter can be changed by the parameter changing unit 1c, and the changed parameter is transmitted to the server 2 by the changed parameter transmitting unit 1d.

On the server 2 side, the mail management means 2a
While storing and managing the transmitted mail, the distribution management means 2b manages the distribution of the mail based on the attribute data added to the transmitted mail. Then, the distribution execution unit 2c distributes the mail according to the instruction from the distribution management unit 2b. As a result, after the distribution, if the mail is not accepted at the destination for some reason, the mail is retransmitted according to the retransmission time and the number of retransmissions set for each mail.

When the parameter is changed on the client, the attribute changing unit 2d rewrites the retransmission parameter of the attribute data managed by the distribution management unit 2b to the changed content. As a result, the retransmission time, retransmission interval, and the like of the already transmitted mail can be changed.

Next, a more specific embodiment of the present invention will be described. FIG. 2 is a block diagram showing a schematic configuration of functions of the electronic mail system of the present embodiment. In this e-mail system 10, a client 50
An example is shown in which an e-mail is transmitted via the servers 30 and 40 to the server. In addition, between the client 20 and the server 30,
The connection between the server 30 and the server 40 and the connection between the server 40 and the client 50 are made by lines L1, L2, and L3 such as a LAN and a public line.

In the client 20 on the transmitting side, when the user starts the mail transmission, the transmission operation unit 21 having the functions of the retransmission parameter setting means 1a and the parameter changing means 1c shown in FIG. 1 opens the mail sheet on the screen. ,
Prompt the user for parameters required for sending e-mail.
The parameters necessary for this mail transmission include a subject, a destination, and the like, and also a retransmission parameter for when the mail is not delivered to the destination once.

FIG. 3 shows an example of a retransmission parameter input screen. On this retransmission parameter input screen 211,
First, the user sets the retransmission method using the retransmission method setting column 211a. Specifically, the user selects from “designated by number of times and interval”, “designated by interval and time limit”, and “designated by time limit and number of times”. Here, for example, "specify with the number of times and interval"
Is selected, the retransmission count column 211b and the retransmission interval column 211
c is ready for input. The user uses a keyboard or the like to enter desired numbers in both fields. Also, the retransmission time limit is internally calculated from the input number of retransmissions, the retransmission interval, and the current time, and displayed in the retransmission time limit column 211d.

As the retransmission parameter, a value considered to be general in normal operation can be registered in the client 20 or the server 30 that accepts transmission. Alternatively, a unique value can be prepared for the entire e-mail system 10. Further, the user can appropriately adjust the numerical value based on this value or omit the input itself.

Returning to FIG. 2, when the input of the parameters for transmission is completed, the transmission of the mail is performed via the transmission unit 22 having the functions of the mail transmission unit 1b and the change parameter transmission unit 1d shown in FIG. Do. When a transmission operation is performed by the user, the transmission unit 22 adds the set parameters to the mail as attribute data and transmits the mail to the server 30 via the line L1.

On the server 30 side receiving this, the mail receiving unit 31 receives the transmitted mail and generates an ID associated with the mail. Then, the mail is stored in the mail management table 32 having the function of the mail management unit 2a shown in FIG. 1 in association with the ID.

At the same time, the mail receiving unit 31
Is based on email attribute data and information such as the current time.
The transmission status data is given to each destination of the mail, and the distribution management table 3 is provided via the distribution management unit 33 having the functions of the distribution management unit 2b and the attribute change unit 2d shown in FIG.
4. Register the e-mail.

FIG. 4 is a diagram showing an example of the mail management table. In the mail management table 212, ID
Is associated with the sender of the email,
Retransmission parameters, retransmission attempt times, transmission state data, and the like are managed. Here, the retransmission attempt time indicates the time at which transmission or retransmission was attempted. That is, the time of the first transmission is displayed between the first transmission and the first retransmission,
After the first retransmission, the time at which the most recent retransmission was attempted is displayed.

The transmission state data given to each destination of the mail includes, for example, “incoming”, “error”,
There are “transmitting” and “waiting for retransmission”. That is, "incoming"
Is given if the mail is successfully stored in its destination mailbox. "Error"
Is given when an incoming call fails beyond the retransmission limit. “During transmission” is given during execution of the distribution process. Further, “waiting for retransmission” is given when distribution is started, the transmission is within the retransmission limit, and a call has not yet been received.

At the time of registration in the distribution management table 34, "sending" is given to the mail. Returning to FIG.
The mail receiving unit 31 passes the received mail ID and destination to the distribution execution unit 35 and requests distribution. The delivery execution unit 35 extracts the corresponding mail from the mail management table 32 based on the ID via the delivery management unit 33,
Distribution is performed to each destination via the line L2 or the like. Then, when the delivery of these mails is successful, the delivery execution unit 35 sends the transmission status data of the destination of the corresponding mail in the delivery management table 34 via the delivery management unit 33 to “transmitting”. To "incoming". The mail after the distribution is received when the client 50 on the receiving side accesses the mailbox 42 of the server 40 via the line L3 or the like.

On the other hand, if the distribution has failed, the distribution executing unit 35 changes the transmission status data of the destination from “transmitting” to “waiting for retransmission”. By the way, the reasons for the failure of distribution are as follows.

(1) The permissible amount (the size and number of mails) of the mailbox 42 and the like of the server 40 on the receiving side is limited. (2) The receiving service is not running.

(3) The limit of simultaneous processing of requests in the receiving service has been exceeded. (4) The server 4 on the receiving side due to a failure of the line L2
No line connection at 0.

(5) The server 40 on the receiving side has not been started. (6) The mode is such that the reception service cannot be received. When the execution of the distribution process to all the destinations is completed, the distribution execution unit 35 checks whether there is any destination that has failed in the distribution. This can be confirmed by the success or failure of the reception completion from the distribution reception unit 41 of the server 40. Then, if the distribution to all the destinations is successful, the target mail is deleted from the mail management table 32. On the other hand, if there is at least one destination that could not be delivered, the delivery execution unit 35 inquires of the delivery management table 34 whether the current mail has been designated for retransmission.

If the current mail has been designated for retransmission, the transmission history information is updated, and the current distribution processing ends. If the current mail has not been designated for retransmission, the delivery execution unit 35 sends the destination and the transmission source that could not be delivered to the notification unit 36. At the same time, the delivery execution unit 35
Changes the transmission status data of the destination of the corresponding mail in the distribution management table 34 from “transmitting” to “error”. Then, this mail is deleted from the mail management table 32, and the current distribution processing is terminated.

When the notifying unit 36 receives the destination and the transmission source that could not be distributed from the distribution execution unit 35, it notifies the transmission source that the distribution was not possible and the destination. As a means of notification, an error mail including a destination that could not be delivered is created and transmitted to the sender, or a line L1
Establishes a connection to the sender via
It is conceivable that the notification is given to the notification accepting unit 24 of 0, or the client periodically makes an inquiry, and the notifying unit 36 provides the latest data to the inquiry.

The distribution receiving unit 41 of the server 40 on the receiving side
When distribution is accepted, an attempt is made to store the mail in the mailbox 42 of the corresponding destination. If the mail is successfully stored, the success is sent to the delivery execution unit 35. On the other hand, the reasons (1), (3),
As in (6), even when the server 40 is operating, the mail storage may fail. In this case, the distribution accepting unit 41 notifies the distribution executing unit 35 that the distribution has failed.

If the mail is successfully stored, the server 40
Receives the reception request from the client 50 on the receiving side, reads out the mail corresponding to the recipient from the mailbox 42, and provides it.

The distribution management unit 33 of the server 30
Based on the time indicated by 7, the mail of the distribution management table 34 is monitored. More specifically, the destination of “waiting for retransmission” is extracted from the mails in the distribution management table 34, the retransmission interval set by the retransmission parameter is compared with the current time, and the timing of retransmission is determined. At the timing of retransmission, the distribution management unit 33 requests the distribution execution unit 35 to distribute to the corresponding destination. Distribution execution unit 35 receiving this
Changes the transmission status data of the corresponding destination in the distribution management table 34 from "waiting for retransmission" to "during transmission", and performs a distribution process in the same manner as distribution immediately after transmission.

If the distribution cannot be performed at the final retransmission timing, the distribution execution unit 35 sends the destination and the transmission source that could not be distributed to the notification unit 36. At the same time, the delivery execution unit 35 changes the transmission status data of the destination of the corresponding mail in the delivery management table 34 to “transmitting”.
To "error". Then, this mail is deleted from the mail management table 32, and the current resending process is ended. This retransmission processing is repeatedly executed at a constant cycle, independently of the reception of mail from the client side.

As described above, during distribution and retransmission, the client 20 on the transmitting side refers to the retransmission information,
Can be updated. On the client 20 side, when the user requests viewing of the transmission history information, the transmission operation unit 2
1 provides the transmission history information to the user via a monitor or the like. This transmission history information can be realized, for example, by inquiring the distribution management unit 33 of the server 30 about information in the distribution management table 34.

FIG. 5 is a view showing a display example of transmission history information. In the transmission history information screen 213, as data relating to the transmitted mails D1 to D4, respective destinations,
The transmission date and time, subject, and attached document name are displayed. Also,
Here, data not shown in the example of the distribution management table 212 in FIG. 4, such as “subject” and “attached document name”, are displayed. However, this is possible by adding necessary elements to the distribution management table. Become.

On the other hand, when the user specifies a transmitted mail and requests transmission history information to the client 20, the transmission operation unit 21 requests the distribution information access unit 23 for this. The distribution information access unit 23 accesses the server 30 using communication means or the like, reads out the transmission history information of the requested specific mail, and sends it to the transmission operation unit 21. The transmission operation unit 21 receiving this displays this as specific transmission history information.

FIG. 6 is a diagram showing a display example of the specific transmission history information. In the specific transmission history information 214, the subject, destination, and transmission status of the mail specified by the user,
Retransmission parameters such as the number of retransmissions set at the start of transmission, the remaining number of retransmissions, and the retransmission attempt time are displayed.

When the user wants to change the setting of the retransmission parameter of the mail during the data display, the user clicks the retransmission method change menu 214a on the screen. Thereby, a screen display similar to the retransmission parameter input screen 211 shown in FIG. 3 is displayed on the screen, and the setting can be changed on the screen.

When the setting of the retransmission parameter is changed,
The distribution information access unit 23 accesses the distribution management unit 33 of the server 30 using communication means, and changes the contents of the distribution management table 34.

In FIG. 2, each block is connected by an independent line for the purpose of explaining the function, but all the blocks may be connected to one line. Although the client 20 is the transmitting side and the client 50 is the receiving side here, actually, both the clients 20 and 50 have the functions of both the transmitting side and the receiving side. Also, the server 30
The server 40 also has both a distribution function and a reception function.

FIG. 7 is a flowchart showing a processing procedure at the time of starting mail transmission by the client 20 on the transmission side. [S1] It is determined whether or not activation of mail transmission has been performed.
If so, the process proceeds to step S2; otherwise, step S1 is repeated. [S2] The retransmission parameter input screen 211 is displayed. [S3] An operation for setting retransmission parameters is accepted on the screen. [S4] Upon completion of the operation, the mail and the attribute data including the retransmission parameter are transmitted to the server.

FIG. 8 is a flowchart showing a procedure for changing a retransmission parameter after sending a mail by the client 20 on the transmission side. [S11] It is determined whether or not a request for transmission history information of a specific mail has been made by the user. If so, the process proceeds to step S12, and if not, the process repeats step S11. [S12] A specific transmission history information screen is displayed. [S13] It is determined whether a request for changing the retransmission parameter has been made. If the request has been made, the process proceeds to step S14. If not, the process returns to step S12. [S14] The operation for changing the retransmission parameter is accepted on the screen. [S15] The changed retransmission parameter is transmitted to the server.

FIG. 9 is a flowchart showing a mail delivery processing procedure performed by the server 30 on the transmission side. [S21] The mail transmitted from the client 20 is received, and an ID corresponding to the mail is generated. [S22] The mail for which the ID has been generated is stored in the mail management table 32, and transmission status data is given to each destination of the mail and registered in the distribution management table 34. [S23] The mail is distributed to each destination. [S24] It is determined whether there is a destination for which distribution has failed. If so, the process proceeds to step S25; otherwise, the process proceeds to step S25.
Proceed to 27. [S25] It is determined whether or not the current mail is designated for retransmission, and if so, the process proceeds to step S28,
Otherwise, the process proceeds to step S26. [S26] The mail transmission source client is notified of the fact that distribution was not possible and its destination. [S27] The target mail is deleted from the mail management table 32. [S28] The transmission history information in the distribution management table 34 is updated based on the results of the distribution performed in steps S21 to S27.

FIG. 10 is a flowchart showing a procedure for resending a mail by the server 30 on the transmitting side. [S31] It is determined whether or not the mail including the destination in the “waiting for retransmission” state remains in the distribution management table 34.
If it remains, the process proceeds to step S32; otherwise, the process ends. [S32] A mail having a destination of "waiting for retransmission" is extracted from the distribution management table 34, and the retransmission time set by the retransmission parameter of the mail is compared with the current time. [S33] It is determined whether or not it is a retransmission timing. If so, the process proceeds to step S34; otherwise, the process returns to step S31. [S34] The transmission status data of the mail is changed from "waiting for retransmission" to "transmitting", and retransmission processing is executed. [S35] As a result of the retransmission, it is determined whether or not there is a destination for which the distribution has failed. If so, the process proceeds to step S36; otherwise, the process proceeds to step S38. [S36] It is determined whether or not this retransmission is the final delivery. If so, the process proceeds to step S37; otherwise, the process proceeds to step S39. [S37] It notifies the client of the mail transmission source of the fact that delivery was not possible and its destination. [S38] The target mail is deleted from the mail management table 32. [S39] The transmission history information in the distribution management table 34 is updated based on the results of the distribution performed in steps S31 to S38.

FIG. 11 is a flowchart showing a mail receiving procedure in the server 40 on the receiving side. [S41] Distribution of mail is accepted. [S42] The mail is stored in the mailbox of the destination user. [S43] The result of distribution is returned to the server of the distribution source.

As described above, in the present embodiment, the retransmission parameter can be set by the user on the client 20 side of the mail transmission source, so that the e-mail system setting is not performed for each user or system.
The retransmission method can be set freely and easily for each mail.

In this embodiment, after sending the mail,
Since the retransmission parameter can be changed, for example, even if a mail sent as a normally handled mail is later noticed to be urgent, it can be easily changed.

Next, a second embodiment of the present invention will be described. FIG. 12 is a block diagram showing a schematic configuration of functions of the electronic mail system according to the second embodiment of the present invention. This e-mail system 60 has a retransmission parameter table 25 in addition to the configuration of the client 20 of the e-mail system 10 of FIG. Portions are given the same reference numerals and description thereof is omitted.

In the client 20, a plurality of mail distribution services can be selected. One retransmission parameter is set and registered in advance in each mail distribution service. These retransmission parameters are
The patterns are set to mutually different patterns and stored in the retransmission parameter table 25. In such a setting, when transmitting a mail, the user selects the retransmission parameter on the retransmission parameter selection screen. The retransmission parameter selection screen is displayed by the transmission operation unit 21.

FIG. 13 shows an example of the retransmission parameter selection screen. On the retransmission parameter selection screen 71, each retransmission parameter pattern stored in the retransmission parameter table 25 is switched and displayed. When the user selects a desired pattern, a mail delivery service having a retransmission parameter of the pattern is selected. That is,
For example, if "pattern 1" is selected as shown in the figure,
The combination of the number of retransmissions of 5 and the retransmission interval of 20 minutes is automatically set. The mail transmission is executed using the mail distribution service selected in this manner.

As described above, by preparing and selecting a plurality of retransmission parameter patterns, the retransmission parameter can be set with a simpler operation. Also, since the server is connected to a server that executes the mail distribution service of the selected pattern, the server can execute the mail with a certain retransmission parameter. Therefore, the retransmission parameters need only be switched and selected only on the client side, which simplifies the design and provision of the system.

The retransmission parameter pattern can be obtained by making an inquiry to a connectable mail delivery service. Or you may make it register by a user's hand beforehand. In any case, the retransmission parameter pattern and the mail delivery service are stored in the retransmission parameter table 25 in a corresponding manner.

The retransmission parameters are set in this way,
When the user issues a transmission command, the transmission unit 22 communicates with the server having the mail distribution service of the pattern set in the above-described procedure.

[0057]

As described above, according to the present invention, the retransmission method can be parameter-set on a per-mail basis on the client. The retransmission method can be set freely and easily for each case.

Also, in the present invention, the retransmission time and retransmission interval of already transmitted mail can be changed on the client side, so that, for example, a mail that is transmitted as a normal mail is urgently required later. Even if you notice it, you can easily change it. Therefore, the system can be made flexible.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the concept of the function of an electronic mail system of the present invention.

FIG. 2 is a block diagram illustrating a schematic configuration of a function of the electronic mail system according to the embodiment.

FIG. 3 is a diagram showing an example of a retransmission parameter input screen.

FIG. 4 is a diagram illustrating an example of a mail management table.

FIG. 5 is a diagram showing a display example of transmission history information.

FIG. 6 is a diagram illustrating a display example of specific transmission history information.

FIG. 7 is a flowchart illustrating a processing procedure when mail transmission is started by a client on the transmission side.

FIG. 8 is a flowchart showing a processing procedure for changing a retransmission parameter after a mail is transmitted by a client on the transmission side.

FIG. 9 is a flowchart illustrating a mail delivery processing procedure performed by a server on the transmission side.

FIG. 10 is a flowchart illustrating a processing procedure of mail retransmission by the server on the transmission side.

FIG. 11 is a flowchart showing a mail receiving procedure in a server on the receiving side.

FIG. 12 is a block diagram illustrating a schematic configuration of functions of an electronic mail system according to a second embodiment of the present invention.

FIG. 13 is a diagram showing an example of a retransmission parameter selection screen.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 client 1a retransmission parameter setting means 1b mail transmission means 1c parameter change means 1d change parameter transmission means 2 server 2a mail management means 2b distribution management means 2c distribution execution means 2d attribute change means 10 electronic mail system 20, 50 client 21 transmission operation unit 22 transmission unit 23 distribution information access unit 24 notification reception unit 30, 40 server 31 mail reception unit 32 mail management table 33 distribution management unit 34 distribution management table 35 distribution execution unit 36 notification unit 41 distribution reception unit 42 mailbox 43 reception reception unit

Claims (8)

[Claims] 1. An electronic mail system having a mail resending function, wherein a resending parameter setting means for enabling a parameter setting of the resending method for each mail on a client; Mail sending means for sending the added mail to the server side; mail managing means for storing and managing the sent mail on the server side; and sending the mail to the attribute data added to the sent mail. An electronic mail system comprising: a distribution management unit that performs distribution management of the mail based on the distribution management unit; and a distribution execution unit that distributes the mail according to a command from the distribution management unit. 2. A parameter changing means for changing, on the client, a parameter for resending the mail which has been transmitted, a change parameter transmitting means for transmitting the changed parameter to the server, and the distribution management. 2. The electronic mail system according to claim 1, further comprising: an attribute changing unit that changes the retransmission parameter of the attribute data managed by the unit to the changed content. 3. The retransmission parameter setting means is configured to select and set one or more of the number of retransmissions, a retransmission time interval, and a retransmission time limit as the retransmission parameter. 1. The e-mail system according to 1. 4. An electronic mail system according to claim 1, further comprising transmission history information display means for inquiring of the server side about the transmission history of the transmitted mail up to the present and displaying the transmission history on the client side. . 5. When the delivery fails within the time limit set by the retransmission parameter, a notification unit that notifies the client that the delivery has failed and the subject of the mail that failed to deliver is provided. 2. The e-mail system according to claim 1, further comprising: 6. An electronic mail system having a mail resending function, comprising: a resending parameter setting means for setting the resending parameter by selecting an arbitrary setting pattern from a plurality of setting patterns of resending parameters prepared in advance. A service selection unit that selects a mail delivery service that matches the set retransmission parameter; and a delivery execution unit that connects to the selected mail delivery service to deliver the mail. Email system. 7. A client on the transmitting side of an electronic mail system having a mail resending function, wherein: a resending parameter setting means for enabling parameter setting of the resending method for each mail; And a mail transmitting means for transmitting the added mail to the server as one of them. A client of the e-mail system, comprising: 8. A server on the transmission side of an electronic mail system having a function of resending a mail, a mail management means for storing and managing a mail transmitted from a client, and a retransmission parameter added to the transmitted mail. A server for an electronic mail system, comprising: a delivery management unit that manages delivery of the mail based on the following: and a delivery execution unit that delivers the mail in response to a command from the delivery management unit.