JP2000029799A - Transmission control method and reception control method for electronic mail system, and the electronic mail system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the propagation of viruses from a transmitter side to the outside and to eliminate the time and labor of checking the viruses on a reception side. SOLUTION: At transmitting and receiving of electronic mail which utilize a network, a transmission side equipment checks whether or not the electronic mail to be transmitted is infected with the virus, transmits the fast that the virus is not detected, the name of a virus check software, and the proof of a version to the electronic mail in a form which is alteration impossible and transmits it. A reception side equipment verifies the proof and receives the electronic mail, when it is proper.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission control method, a reception control method, and an electronic mail system of an electronic mail system, and more particularly, to the spread of a computer virus (hereinafter simply referred to as a virus) from a sender to the outside. The present invention relates to a transmission control method, a reception control method, and an e-mail system of an e-mail system, which can prevent the e-mail system from performing a virus check on the receiving side and can save the trouble of checking the virus.

[0002]

2. Description of the Related Art For example, Japanese Patent Application Laid-Open No.
There is known a technique described in Japanese Patent Application Laid-Open Publication No. H10-163, etc. In this conventional technique, an OS of a computer or an object program executed as a program itself diagnoses infection with a virus. Also, as another conventional technique, a virus check is manually performed on an e-mail to be transmitted using virus check software,
It is known that the result is written with information such as “ABC virus checker, virus check has been performed by version 1.0. There is no virus” in the e-mail and transmitted.

[0003]

The prior art described above is
No consideration is given to automatically checking the e-mail for viruses when sending e-mails, and if there is an omission in virus checking, there is a problem that the virus may spread through the network. ing.

Further, in the above-mentioned prior art, consideration has been given to the fact that an e-mail receiving device automatically determines the result of a virus check in a transmitting device to determine whether or not to receive an incoming mail. Not done. For this reason, in the above-mentioned conventional technology, the range of the result of the virus check manually given on the transmission side that can be accepted, for example, the product name and version of the virus check software that performed the virus check are appropriate. It must be confirmed by the human eye whether or not it is an object, and there is a problem that the work for that is troublesome.

[0005] An object of the present invention is to solve the above-mentioned problems of the prior art, automatically execute a virus check at the time of sending an e-mail, and electronically check the information of the result and the information of the software that performed the virus check. It is an object of the present invention to provide a transmission control method of an electronic mail system that transmits an electronic mail by attaching it to a mail.

[0006] Another object of the present invention is to provide a proof that no virus check software product name, version, or virus that can be received by the receiving side is detected when the electronic mail transmitted as described above is received. An object of the present invention is to provide a reception control method of an e-mail system in which a certain e-mail is accepted, and if the e-mail cannot be accepted, the transmitted e-mail is returned to the transmission side with the reason.

A further object of the present invention is to provide an electronic mail system in which the above-mentioned transmission and reception are integrated.

[0008]

According to the present invention, there is provided a transmission control method for an electronic mail system for transmitting and receiving electronic information via a network, wherein the electronic information to be transmitted includes a computer virus. By using virus check software, and transmitting the electronic information only when a computer virus is not detected as a result of the verification. When transmitting the information, by adding proof information that a computer virus is not detected to the electronic information to be transmitted, furthermore, as a result of the verification, when the computer virus is not detected and the electronic information is transmitted, Credentials that the computer virus is not detected and the computer Virus is achieved by providing the attribute information such as name and version information of the virus checking software was verified not to be detected in an information to be the transmission.

[0009] Further, the object is to encrypt the certifying information so that the certifying information can be confirmed on a transmission side or a receiving side in order to prevent the certifying information from being tampered with on a network. This is achieved by sending the information.

It is another object of the present invention to provide a reception control method for an electronic mail system for transmitting and receiving electronic information via a network, wherein the electronic information to be received is provided with proof information that no computer virus is detected. Recognizing whether or not the electronic information to be received is received only when the certification information that a computer virus is not detected is attached to the electronic information to be received, If the information is provided with proof information that no computer virus is detected, the attribute information such as the name and version of the virus check software that performed the proof given to the electronic information is also valid. In some cases, this is achieved by receiving electronic information.

[0011] Further, the object is to provide a method for controlling reception of an electronic mail system for transmitting and receiving electronic information via a network, wherein the electronic information to be received is not provided with certification information that no computer virus is detected. In the case where the attribute information such as the name and the version of the virus check software that certifies the electronic information is not valid even if the certificate information is attached, , By sending back to the sender of the electronic information.

Further, the object is to provide an electronic mail system for transmitting and receiving electronic information via a network,
Means for verifying whether or not a computer virus is included in the electronic information to be transmitted by virus check software; and a computer virus is detected in the electronic information only when the computer virus is not detected as a result of the verification. Means for transmitting the electronic information by providing proof information that the computer virus is not detected; means for recognizing whether the electronic information to be received is provided with proof information that no computer virus is detected; Means for receiving the electronic information only when the electronic information is provided with certification information that no computer virus is detected.

[0013] Further, the object is that when the certification information to be received is encrypted, the receiving side checks the encrypted certification information, and for example, a key for decrypting the encrypted certification information. Is confirmed by the receiving side to be able to decrypt the proof information, and the e-mail is received at that time.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of an electronic mail transmission / reception control method and an electronic mail system according to the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an e-mail system for transmitting and receiving e-mail via a network according to an embodiment of the present invention, FIG. 2 is a block diagram showing the configuration of a device on the transmission side, and FIG. 2 is a block diagram showing the configuration of the device. 1 to 3, reference numeral 101 denotes a transmission processing unit;
102 is a transmission instruction receiving unit, 103 is a certification information adding unit, 1
04 is a transmission determination unit, 105 is a transmission unit, 106 is a personal mail transmission processing unit, 107 is a mail editing unit, 108 is a mail transmission instruction unit, 109 is a virus check unit, 201 is a reception processing unit, 202 is a reception unit, 203 is an attached information reading unit, 204 is a distribution determining unit, 205 is a rejection notification editing unit, 2
06 is a rejection mail transmission unit, 207 is a rejection information notification unit, 2
08 is a mail distribution unit, 209 is a personal mail reception processing unit, 210 is a distribution mail reception unit, 211 is a rejection information reception unit, and 1501 is a network.

As shown in FIG. 1, an electronic mail system according to an embodiment of the present invention includes a personal mail transmission processing unit 1.
06, a reception processing unit 201 connected to a personal mail reception processing unit 209, and a network 1501 interconnecting the transmission processing unit 101 and the reception processing unit 201. It is configured. Usually, the transmission processing unit 101 and the reception processing unit 201
It may be configured in a mail server, and includes a personal mail transmission processing unit 106, a personal mail reception processing unit 20
9 may be configured in a personal user's personal computer or the like.

In the electronic mail system configured as described above, an electronic mail to be transmitted from the personal mail transmission processing unit 106 is determined by the transmission processing unit 101 via the network 1501 via the reception processing unit 201.
Sent to. The reception processing unit 201 determines the received electronic mail, and distributes the received electronic mail to the personal mail reception processing unit 209 based on the result. These processes will be described later with reference to FIGS.

In the above description, the personal mail transmission processing unit 106 and the personal mail reception processing unit 209 mutually transmit and receive electronic mail, and are shown as separate components, respectively. The transmission processing unit 106 for personal mail and the reception processing unit 209 for personal mail may be integrally configured, and the transmission processing unit 101 and the reception processing unit 201 may be configured in one mail server or the like. Is also good.

Next, the configurations of the transmission processing unit 101 and the personal mail transmission processing unit 106 will be described with reference to FIG.

The transmission processing unit 101 is usually configured in a mail server on the transmitting side, and as shown in FIG. 2, a transmission instruction receiving unit 102, a virus check unit 109,
It is composed of a proof information providing unit 103, a transmission determination unit 104, and a transmission unit 105. The personal mail transmission processing unit 106 includes a mail editing unit 107 and a transmission instruction unit 10.
8.

In the above description, the transmission processing unit 1 for personal mail
The mail editing unit 107 edits the mail to be transmitted, creates a mail body, and performs processing such as filling in and selecting a destination or attaching an attached file to the mail body. The transmission instruction unit 108 instructs the transmission processing unit 101 to transmit the mail edited by the mail editing unit 107.

Transmission instruction receiving section 102 of transmission processing section 101
Is a transmission instruction unit 108 of the personal mail transmission processing unit 106
To receive the mail instructed to be transmitted and the transmission instruction request. The virus check unit 109 includes the transmission instruction receiving unit 10
A virus check is performed on the mail designated to be sent in step 2. If no virus is detected as a result of the virus check by the virus check unit 109, the proof information providing unit 103 provides proof information that no virus is detected, the name of the virus check software that performed the virus check, and its version. And other attribute information to the mail.

The information added to the mail to be transmitted is information encrypted to prevent tampering on the network, and is added to the mail by the virus check unit 109 and the information adding unit 103. Yes, the operator does not input the information from a keyboard or the like.

Next, the configurations of the reception processing unit 201 and the reception processing unit 209 for personal mail will be described with reference to FIG.

The reception processing unit 201 is usually configured in a mail server on the reception side, and as shown in FIG. 3, a reception unit 202, an additional information reading unit 203, and a distribution discrimination unit 2
04, rejection notification editing unit 205, and rejection mail transmission unit 2
06, a rejection information notification unit 207, and a mail distribution unit 208
It is composed of Also, a personal mail reception processing unit 2
09 is a delivery mail receiving unit 210 and a rejection information receiving unit 2
11.

In the above description, the reception unit 202 of the reception processing unit 201 is for receiving a mail, and the added information reading unit 203 is configured to add the electronic mail received by the reception unit 202 as encrypted information. It reads proof information that no virus is detected and information such as the name and version of the virus check software that has performed the virus check.

If the encrypted information is added to the e-mail received by the receiving unit 202, the receiving unit 2
02 decrypts the information encrypted with the encryption key managed by the receiving unit 202, and instructs the distribution determining unit 204 not to distribute the electronic mail on the receiving side when the information cannot be decrypted.

The distribution determining unit 204 is provided with the additional information reading unit 20
From the information read in step 3, it is determined whether or not to deliver the mail to the destination described in the mail. For example, if there is no proof information that no virus is detected, the mail is sent to the destination. Is determined not to be distributed. Further, for example, when the name of the virus check software that has performed the virus check is not recognized by the receiving side or the version is old, the delivery determination unit 204 determines that the mail is not to be delivered to the destination. . Then, the distribution determining unit 204 reads the proof that the virus is not detected, and furthermore, if the name and version of the virus check software can be permitted on the receiving side, the mail is distributed to the above-mentioned destination. Determine.

[0029] The rejection notification editing unit 205
4 creates reason information indicating that mail is not to be delivered to a mail determined not to be delivered to the destination.
Create information indicating that the virus check software that performed the virus check is not approved by the receiving side. The rejection mail transmitting unit 206 adds the reason information created by the rejection notification editing unit 205 to the mail and sends it back to the sender of the mail. Rejection information notification unit 2
07 is the reason information created by the rejection notice editing unit 205,
This is to notify the destination of the mail. The mail delivery unit 208 delivers the mail determined to be delivered by the delivery determination unit 204 to the destination of the mail.

The personal mail reception processing unit 209 serves as a destination of the mail, receives the mail distributed from the mail distribution unit 208 of the reception processing unit 201 by the distribution mail reception unit 210, and outputs the rejection information. The rejection information receiving unit 211 receives the rejection reason information notified from the notification unit 207.

FIG. 4 is a flowchart for explaining the processing operation of mail transmission control by the transmission processing section shown in FIG. 2. This will be described below.

(1) In the personal mail transmission processing unit 106, when the sender edits the mail, sends the mail to the transmission processing unit 101, and instructs the transmission of the mail, the transmission processing unit 101 is instructed to transmit. A virus check is performed to determine whether the mail body and the file attached to the mail are infected with a virus (steps 301 and 302).

(2) As a result of the virus check,
It is determined whether a virus has been detected (step 3).
03).

(3) As a result of the check in step 303,
If no virus is detected, proof information indicating that no virus is detected and attribute information such as the name and version of the virus check software that has performed the virus check are added to the mail in a form that is difficult to falsify (step 3).
04, 306).

(4) After the processing in step 306 is completed, the mail is transmitted to the destination specified in the mail transmission instruction in step 301 (step 307).

(5) As a result of the check in step 303,
If a virus has been detected, the mail is not sent to the destination, and the transmission processing unit 106 of the personal mail, which is the sender, is notified to display the presence of the virus on the screen of the sender or the like ( Steps 305, 308).

FIG. 5 is a flowchart for explaining the processing operation of the mail reception control by the reception processing unit shown in FIG. 3. This will be described below.

(1) When an e-mail is received via a network, the reception processing unit 201 confirms that the virus attached to the e-mail is not detected, the name of the virus check software that has performed the virus check, Then, attribute information such as the version is read (steps 401 and 402).

(2) Then, it is determined from the information thus read whether the received mail can be accepted. This determination is based on whether there is evidence that the virus is not detected,
This is performed based on whether or not the name of the virus check software that has been virus checked and the attribute information such as its version match the names and versions of some virus check software preset on the receiving side (step 403). ).

(5) In the determination in step 403, there is a proof that a virus is not detected, and the attribute information such as the name and version of the virus check software that has been checked for viruses contains several viruses set in advance on the receiving side. If the name of the check software matches the attribute information such as its version, it is determined that the mail can be accepted, and the mail is delivered to the destination described in the mail (steps 404 and 406). .

(6) If it is determined in step 403 that there is no proof that no virus can be detected, or that the information of the name and version of the virus check software that has been checked for viruses contains some information set in advance on the receiving side. If the name does not match the name of the virus check software and its version, it is determined that the mail cannot be accepted (step 405).

(7) When it is determined that the rejection is unacceptable, the rejection notification that the rejection is unacceptable is edited, and an unreliable notification such as "Since it is unacceptable, sent back to the sender." Will be Then, the e-mail is sent back to the sender as a rejection e-mail, and further, the destination indicated in the e-mail is notified that the e-mail was not delivered. The rejection notice is, for example, a rejection notice that the virus is not detected because there is no information that the virus is not detected, or the name and version of some virus check software whose name or version is preset on the receiving side. Is a rejection notification that it is not acceptable because it does not conform to (steps 407, 409, 408).

FIG. 6 is a diagram for explaining the data structure of mail.
FIG. 7 is a diagram illustrating the data structure of a rejection mail, and FIG. 8 is a diagram illustrating the data structure of a mistrust notification mail.
These will be described.

As shown in FIG. 6, the data of the e-mail transmitted in the e-mail transmission processing in step 307 is as follows.
The information includes destination information 501, sender information 502, e-mail title information 503, e-mail text information 504, file information 505 attached to the e-mail, virus check certification information 506, and other information 507. You. The destination information 501 is information such as the name and address of the destination of the mail, and the sender information 502 is information such as the name and address of the sender of the mail. The mail title information 503 is the title and title of the mail to be transmitted. The mail body information 504 is information on the body of the mail to be transmitted. File information 50 to be attached to mail
Reference numeral 5 denotes information on a file attached to a mail to be transmitted. The virus check proof information 506 is information such as a proof that no virus is detected in the e-mail to be transmitted, and the name, version, date, and the like of the virus check software that determines that no virus is detected. Other information 507 is control information for urgent mail, urgent response, confirmation of reception, transmission of another mail, and the like.

In the transmission processing of the rejection notice and the distrust notice in step 408 described above, the data of the rejection mail sent back to the sender of the mail contains the sender information 502 as shown in FIG.
, Mail server information 601, mail title information 503, mail body information 504, file information 505 attached to the mail, and rejection notification information 602. The mail server information 601 is information such as the name and address of the mail server that has received the mail, and the rejection notification information 602 is a rejection notification edited in the rejection notification editing process of step 407. Other information is the same as in the case of FIG. The rejection notification information 60
2 will be described later.

In the transmission processing of the rejection notice and the mistrust notice in the above-described step 408, the data of the mistrust notice mail notifying that the mail is not delivered to the destination of the mail, as shown in FIG. , Mail server information 601, sender information 502, mail title information 503, and mistrust notification information 701.
The mistrust notification information 701 is a notification that the mail edited in the process of editing the mistrust notification in step 409 was not delivered, and the other information is the same as in FIGS. 6 and 7. The mistrust notification information 701 will be described later.

Next, an example of a screen displayed to a sender and a receiver of a mail at the time of various processes according to the embodiment of the present invention will be described.

FIG. 9 is a diagram showing an example of a mail transmission screen when a sender attempts to transmit a mail.

The mail transmission screen 801 displays the transmission title 8
02, a destination 803, a mail text 804, an attached file 805, a transmission icon 806, and a status display 80
7. The transmission title 802 is the title of the transmission mail, and in the illustrated example, is the title “patent obtained”. The destination 803 is the destination of the mail, and indicates a mail to be transmitted to “Taro Tokyo”. The mail body 804 is the body of the mail. The attached files 805 are some attached files attached to the mail. The transmission icon 806 is an icon used when transmitting the mail text 804 and the attached file 805. When the transmission icon 806 is selected, a virus check is started for the mail body 804 and the attached file 805, and the status display 807 displays that a virus check is being performed. In the illustrated example, the status display 807 displays a status of “Checking for viruses”.

FIG. 10 is a view showing an example of a display screen for a mail sender when a virus is not detected as a result of a virus check.

Display screen 9 when no virus is detected
01 includes a title 802, a destination 803, a mail text 804, an attached file 805, and a transmission completion information display 902. Note that 802 to 805 correspond to FIG.
Is the same as

The transmission completion information display 902 indicates that no virus is detected as a result of the virus check. In the illustrated example, the transmission completion information display 902 displays that no virus is detected as a result of the virus check, the name and version information of the virus check software that performed the virus check, and the virus check end time. I have.

FIG. 11 is a diagram showing an example of a display screen for a mail sender when a virus is found as a result of a virus check.

Screen 1001 when a virus exists
Is the title 802, the destination 803, and the mail text 8
04, attached file 805, and transmission rejection information display 1
002. Note that 802 to 805 are the same as those in FIG.

The transmission rejection information display 1002 indicates that there is a virus as a result of the virus check. In the illustrated example, the transmission rejection information display 1002 indicates that there is a virus as a result of the virus check,
The location, the name of the virus check software that performed the virus check, its version information, and the virus check end time are displayed. At this time, for warning, the background of the screen 1001 when a virus is present can be displayed in red or the like, or can blink.

FIG. 12 is a diagram showing an example of a display screen for notifying the recipient of the mail that the mail has been received.

The mail reception display screen 1101 includes a list 1102 of received mails and an all reception status confirmation icon 1103.
Consisting of The received mail displayed in the received mail list 1102 is a proof that no virus is detected,
This is a received mail that has been verified that a virus check has been performed by virus check software corresponding to the name and version specified on the receiving side. Then, in the received mail list 1102, a list is displayed so that the sender 1104, the reception date 1105, and the title 803 can be recognized. For example, mail 1 from Kanagawa
The sender of 107 is "Ichiro Kanagawa" and the receiving date is "199
The title is "Patented" on August 10, 2009. If there is no proof that the virus is not detected, or that the virus has been checked by virus check software corresponding to the name and version specified by the recipient, the corresponding mail will be rejected,
It is not displayed in the received mail list 1102, and the information can be confirmed by designating the all reception status confirmation icon 1103.

FIG. 13 is a diagram showing an all reception status display screen displayed when the all reception status confirmation icon 1103 on the display screen shown in FIG. 12 is selected.

The all reception status display screen 1201 includes a list display 1202 of all received mails, a rejection information display 1206,
And a rejection detailed icon 1205. A list display 1202 of all received mails shows the reception status 1203 and the sender 1
All information mails are displayed so that the user 104, the reception date 1105, and the title 1106 can be identified. In the illustrated example, mail 1107 from Kanagawa and mail 1 from Yokohama
204 is displayed.

The reception status 1203 is for displaying a message sent back to the sender of the mail without distributing the received mail. In the illustrated example, the mail 120 from Yokohama is displayed.
4 indicates “rejection” at a position corresponding to the acceptance status 1203. As a result, the recipient knows that the mail was not delivered and was sent back to the sender of the mail. The details icon 1205 is selected when confirming the information of the returned mail, and when this icon is selected,
A rejection information display 1206 is displayed. Absolute information display 120
6, the mail 1204 returned from Yokohama is displayed so that the date received by the mail server, the sender, and the title are known, and the reason for the return is the virus tick software that performed the mail virus check. If the wearer does not recognize the wearer,
That is displayed. In the case of the illustrated example, it can be understood that the virus tick software that has performed the virus check on the mail 1204 from Yokohama is a ZZ checker that is not recognized by the receiving AA mail server. Further, the recipient cannot see the contents of this mail, and the sender 11104, the reception date 1105, and the title 1
Only 106 is known.

FIG. 14 is a diagram showing an example of a display screen of the sender displaying the reception status for confirming whether or not the mail has arrived at the destination after the sender performs the mail transmission process.

Display screen 1 for sender displaying reception status
The sent mail list 301 is displayed after the sender performs the mail sending process in step 307 described above.
2, a rejection status detailed icon 1309, and a rejection reason detailed display 1310. On this display screen 1301, each of the mails displayed in the outgoing mail list 1302 is displayed so that the reception status 1303, the destination 803, the transmission date 1305, and the title 802 can be understood. For example, an e-mail 1307 addressed to Chiba has been sent to Saburo Chiba on August 1, 1999, with the title "To Konpota-sama", indicating that it has already been opened. In addition, an e-mail 1308 addressed to Tokyo was titled “Welcome to Elephant” and was sent on September 11, 1999.
It was sent to Tokyo Taro on that day, but it was displayed that this email was rejected and sent back.

The reason for this rejection is displayed on the detailed reason for refusal display 1310 by selecting the detailed rejection status icon 1309. Reason for refusal detail display 1310
According to this, it is understood that the mail of the destination 1312 of the relevant mail was rejected by the BB mail server which is the mail server 1314 of the receiving side on the transmission date 1311 of the relevant mail on September 11, 1999. For further details,
By selecting the rejection notification icon 1313, the rejection notification edited by the rejection notification editing unit 205 is displayed.

FIG. 15 shows the rejection notification icon 1 shown in FIG.
It is a figure showing the example of a refusal notice display screen displayed when 313 is selected.

The rejection notice display screen 1401 shows in detail the reason why the transmitted mail was rejected by the receiving server. The details of this reason have been edited and returned by the rejection notification editing unit 205 in the server on the receiving side. According to the rejection notice display screen 1401 shown in FIG.
On the transmission date 1311 of September 11, 999, the title 1 of “Walrus is there” was added to the destination 1312 of Taro Tokyo.
It can be seen that the mail transmitted in 402 is returned because the virus check software that performed the virus check on the mail was not authorized by the mail server on the receiving side. Then, the name and the version of the virus check software that can be authorized by the receiving mail server are displayed.

According to the above-described embodiment of the present invention, a virus check is automatically performed at the time of sending an e-mail, and only when there is no virus, the result information and the information of the software that performed the virus check are compared. Since it is possible to attach the e-mail to the e-mail and send it, if a virus is found in the e-mail, the e-mail cannot be sent. Therefore, the spread of the virus to the outside can be avoided.

According to the above-described embodiment of the present invention, when the transmitted e-mail is received, the product name and the version of the virus check software that can be received by the receiving side and the fact that the virus is not detected. Only e-mails with a certificate are accepted, and if the e-mail cannot be accepted, the e-mail sent with the reason can be returned to the sender, so that the recipient can check for viruses. Can be omitted.

According to one embodiment of the present invention, it is possible to spread the attitude of not receiving a virus-unchecked one on a communication line such as the Internet, thereby suppressing the spread of the virus. Can also be obtained.

[0069]

As described above, according to the present invention, a virus check is automatically performed when an e-mail is sent, and information of the result and information of the software that performed the virus check are added to the e-mail. The method of controlling the transmission of e-mail to be transmitted and the fact that the receiving side does not detect the product name, version, and virus of the virus check software that can be received by the receiving side when receiving the e-mail It is possible to provide an e-mail reception control method in which only an e-mail with a certification is accepted, and if the e-mail cannot be accepted, the e-mail sent with the reason is returned to the sender.

According to the present invention, as described above, it is possible to prevent the virus from spreading from the sender side to the outside, and to save the trouble of checking the virus on the receiving side.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an electronic mail system for transmitting and receiving electronic mail via a network according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a device configuration on a transmission side.

FIG. 3 is a block diagram showing a device configuration on a receiving side.

FIG. 4 is a flowchart illustrating a processing operation of mail transmission control by the transmission processing unit illustrated in FIG. 2;

5 is a flowchart illustrating a processing operation of mail reception control performed by the reception processing unit illustrated in FIG. 3;

FIG. 6 is a diagram illustrating a data structure of a mail.

FIG. 7 is a diagram illustrating a data structure of a rejection mail.

FIG. 8 is a diagram illustrating a data structure of a mistrust notification mail.

FIG. 9 is a diagram illustrating an example of a mail transmission screen when a sender attempts to transmit a mail.

FIG. 10 is a diagram showing an example of a display screen for a mail sender when a virus is not detected as a result of a virus check.

FIG. 11 is a view showing an example of a display screen for a mail sender when a virus is present as a result of a virus check.

FIG. 12 is a diagram showing an example of a display screen for notifying a mail recipient of the reception of the mail.

13 is a diagram showing an all reception status display screen displayed when an all reception status confirmation icon on the display screen shown in FIG. 12 is selected.

FIG. 14 is a diagram showing an example of a display screen of a sender displaying a reception status for confirming whether or not the mail has arrived at a destination after the sender has performed mail transmission processing.

FIG. 15 is a diagram showing an example of a rejection notice display screen displayed when the rejection notice icon shown in FIG. 14 is selected.

[Explanation of symbols]

 Reference Signs List 101 transmission processing unit 102 transmission instruction receiving unit 103 certification information adding unit 104 transmission determining unit 105 transmitting unit 106 personal mail transmission processing unit 107 mail editing unit 108 mail transmission instruction unit 109 virus check unit 201 reception processing unit 202 receiving unit 203 giving Information reading unit 204 Distribution determining unit 205 Rejection notification editing unit 206 Rejection mail transmission unit 207 Rejection information notification unit 208 Mail distribution unit 209 Personal mail reception processing unit 210 Distribution mail reception unit 211 Rejection information reception unit 1501 Network

Claims (8)

[Claims] 1. A transmission control method for an electronic mail system for transmitting and receiving electronic information via a network, wherein the electronic information to be transmitted includes a computer virus to verify whether or not the computer information contains a computer virus. And transmitting the electronic information only when a computer virus is not detected as a result. 2. The method according to claim 1, wherein, as a result of the verification, no computer virus is detected, and when transmitting the electronic information, proof information indicating that no computer virus is detected is added to the electronic information to be transmitted. 2. The transmission control method of the electronic mail system according to 1. 3. The transmission control method for an electronic mail system according to claim 2, wherein said certification information is encrypted information. 4. As a result of the verification, when a computer virus is not detected and the electronic information is transmitted, proof information that a computer virus is not detected, a name of virus check software verified that no computer virus is detected, and 2. The transmission control method according to claim 1, wherein attribute information such as version information is added to the electronic information to be transmitted. 5. A method for controlling reception of an electronic mail system for transmitting and receiving electronic information via a network, comprising the steps of recognizing whether or not proof information indicating that no computer virus has been detected is attached to the electronic information to be received. Receiving the electronic information only when the electronic information to be received is provided with proof information that no computer virus has been detected. 6. When the electronic information to be received is provided with proof information that no computer virus is detected, the name of the virus check software that has performed the proof added to the electronic information. 5. The reception control method for an electronic mail system according to claim 4, wherein the electronic information is received when the attribute information such as the version and the version is appropriate. 7. A reception control method for an electronic mail system for transmitting and receiving electronic information via a network, wherein the electronic information to be received does not include proof information that no computer virus is detected.
Alternatively, even if the certification information is provided, if the attribute information such as the name and version of the virus check software that has performed the certification given to the electronic information is not appropriate, A method of controlling reception of an electronic mail system, wherein the method returns the electronic information to a sender of the electronic information. 8. An electronic mail system for transmitting and receiving electronic information via a network, means for verifying whether or not the electronic information to be transmitted contains a computer virus by using virus check software, and a result of the verification. Only when a computer virus is not detected, the electronic information is provided with proof information that a computer virus is not detected, and the electronic information is transmitted. Means for recognizing whether or not proof information indicating that there is no computer virus is provided, and receiving the electronic information only when the electronic information to be received is provided with proof information that no computer virus is detected. E-mail system comprising: