JP4506191B2 - E-mail system, e-mail transmission / reception terminal, e-mail deletion method, and e-mail deletion program - Google Patents

Description

  The present invention relates to an e-mail system, an e-mail transmission / reception terminal, an e-mail deletion method, and an e-mail deletion program, and has a function of deleting an e-mail once transmitted via a network between portable terminals such as mobile phones. The present invention relates to an e-mail system, an e-mail transmission / reception terminal, an e-mail deletion method, and an e-mail deletion program.

E-mail satisfies both quick and simultaneous broadcasts as compared to existing mail and telephone as communication means. Compared with facsimiles, e-mail is in motion when using mobile terminals such as mobile phones. Since it has high convenience and convenience such as being able to communicate, it has become widespread.
However, even if you notice an error in the content (text, destination, etc.) immediately after sending the e-mail, for example, it is often received and the same e-mail is sent to multiple destinations as a broadcast. When sending, it may send to the wrong destination.

Thus, while e-mail has high convenience, there is also a risk that it will be disadvantageous if not used correctly, and a recipient who has received an e-mail with wrong contents will be based on this e-mail. As a result, there is a problem that an action is taken immediately, or that information is accidentally leaked to a partner who should not be notified.
If an email with incorrect content is sent, the sender generally contacts the recipient as soon as possible, asks the recipient to delete the email, and asks the recipient to delete it manually. It becomes.

However, it is not only complicated and troublesome for the recipient to delete manually, but also there is a problem that the e-mail deletion lacks certainty.
For this reason, when a deletion function is added to a mail server that relays e-mail on the communication path, and there is a deletion request from the transmission source, this mail server is sent before the e-mail is transferred to the transmission destination. A technique for deleting the corresponding e-mail is proposed.
In addition, even if it is not an error, a technique has been proposed in which an unnecessary e-mail is deleted by a mail server at the receiver's discretion (for example, Patent Document 1 and Patent Document 2). It is also possible to delete e-mails to be deleted.
However, both techniques have a problem that costs increase because new functions are added to the mail server.
For this reason, a technique has been proposed in which an e-mail requesting cancellation of transmission is transmitted to a destination terminal, and the mailer automatically deletes the e-mail even after transmission (for example, Patent Document 3). ).
JP 2003-186808 A JP 2002-73504 A JP 2001-236274 A

The first problem to be solved is that, particularly in the prior art described in Patent Document 3, for example, when a malicious third party pretending to be a sender makes a false deletion request, Cannot be prevented, and there is a risk of deleting even necessary e-mails that are not false alarms, and safety cannot be ensured.
The second problem is that the e-mail cannot be reliably and accurately deleted by simply transmitting / receiving the e-mail requesting deletion.
For example, there still remains a possibility of causing a problem such as accidentally leaking information to a partner who should not be informed.

The present invention has been made in view of the above circumstances, and provides a firstly provided electronic mail system, an electronic mail transmitting / receiving terminal, an electronic mail deleting method, and an electronic mail deleting program capable of ensuring high safety. It is aimed.
Another object of the present invention is to provide an e-mail system, an e-mail transmission / reception terminal, an e-mail deletion method, and an e-mail deletion program that can reliably and accurately delete the corresponding e-mail.

In order to solve the above-mentioned problem, the invention described in claim 1 relates to an electronic mail system for transmitting and receiving electronic mails via a network between a first electronic mail transmitting and receiving terminal and a second electronic mail transmitting and receiving terminal. When the first e-mail transmission / reception terminal receives a transmission mail deletion request for requesting deletion of a transmitted e-mail transmitted to the second e-mail transmission / reception terminal via the network, the second e-mail a deletion request mail generating and sending means against receiving terminal generates and transmits a deletion request mail for obtaining a deletion of the sent e-mail, from the second electronic mail transmission and reception terminals of the deletion of the sent e-mail Upon receiving the delete acknowledge mail for notifying approval, before the receiving, the deletion request mail to the second e-mail sending and receiving terminal transmission Check to see Taka not, the transmission is confirmed, deletion execution instruction of generating and transmitting a deletion execution instruction mail for urging the execution of the deletion of the sent e-mail to the second e-mail transmitting and receiving terminals Rutotomoni such and a mail generating transmitting means, said second electronic mail sending and receiving terminals, the deletion seeking removal of the sent e-mail from said first electronic mail transmission and reception terminals or third electronic mail transmitting and receiving terminals When the request mail is received, the existence of the transmitted e-mail is confirmed, and when the request e-mail is confirmed, the deletion approval mail is generated and transmitted to the first e-mail transmitting / receiving terminal that is the transmission source of the transmitted e-mail. delete note includes a mail generating transmission unit, upon receiving the deletion execution instruction mail from the first e-mail transmitting and receiving terminals, cutting the sent e-mail to It is characterized in that the run.

The invention of claim 2 wherein relates to an electronic mail system according to claim 1, wherein said second electronic mail transmission and reception terminal receives the deletion request mail, the sent electronic included in the delete request mail Based on the specific reference information of the mail, the corresponding transmitted e-mail is searched from the received e-mail stored in the second storage means, and when the e-mail is specified, via the network, The deletion approval mail is transmitted to the first electronic mail transmitting / receiving terminal.

The invention of claim 3, wherein relates to an electronic mail system according to claim 1, wherein said first electronic mail transmitting and receiving terminal, when receiving the deletion acknowledge mail, the deletion request mail contained in the delete acknowledge mail Based on the specific reference information, the corresponding deletion request mail is searched from the transmitted e-mails stored in the first storage means, and when the e-mail is specified , the first e-mail is specified via the network. The deletion execution instruction mail is transmitted to the second e-mail transmission / reception terminal.

The invention of claim 4, wherein relates to an electronic mail system according to claim 1, wherein said second electronic mail transmission and reception terminal receives the deletion execution instruction mail, the deletion contained in the deletion execution instruction mail Based on the specific reference information of the approval mail, the corresponding deletion approval mail is searched from the transmitted e-mails stored in the second storage means. Based on the specific reference information of the included deletion request mail, the corresponding deletion request mail is searched from the received e-mail stored in the second storage means, and when specified, Based on the specific reference information of the transmitted email included in the deletion request email, the received email stored in the second storage means To search the sent e-mail, when a particular is made, it is characterized by performing the deletion of the sent electronic mail.

The invention according to claim 5 relates to the electronic mail system according to claim 1 , 2 or 4 , wherein the second electronic mail transmitting / receiving terminal at least generates and transmits the deletion approval mail. It is characterized by being executed regardless of the instruction operation.

According to a sixth aspect of the invention, there is provided the electronic mail system according to the first or third aspect , wherein the first electronic mail transmitting / receiving terminal at least generates and transmits the deletion execution instruction mail. It is characterized by executing without operation.

A seventh aspect of the invention relates to an electronic mail transmission / reception terminal used in the electronic mail system according to any one of the first to sixth aspects, and has a function as the first electronic mail transmission / reception terminal. It is characterized by that.

According to an eighth aspect of the present invention, there is provided an electronic mail transmission / reception terminal used in the electronic mail system according to any one of the first to sixth aspects, which has a function as the second electronic mail transmission / reception terminal. It is characterized by that.

The invention described in claim 9 relates to an e-mail transmission / reception terminal used in the e-mail system according to any one of claims 1 to 6, and functions as the first and second e-mail transmission / reception terminals. It is characterized by having.

In the invention described in claim 10 , the first e-mail transmission / reception terminal and the second e-mail transmission / reception terminal transmit / receive e-mails via the network and delete the e-mails that have already been transmitted. According to a method, when the first e-mail transmitting / receiving terminal receives a transmission mail deletion request for requesting deletion of a transmitted e-mail transmitted to the second e-mail transmitting / receiving terminal via the network, the network To the second e-mail transmission / reception terminal, and a deletion request e-mail for requesting deletion of the transmitted e-mail is generated and transmitted, and the second e-mail transmission / reception terminal transmits the first e-mail. When the reception terminal or the third electronic mail sending and receiving terminal receives the deletion request mail seeking removal of the sent e-mail, the transmission Confirm the presence of the only e-mail, if it is confirmed, to generate a delete note e-mail to notify the approval of deletion of the sent e-mail, the first of electrons, which are the sent e-mail of the sender When the first e-mail transmission / reception terminal receives the deletion approval e-mail from the second e-mail transmission / reception terminal, the deletion is sent to the second e-mail transmission / reception terminal before the reception. confirm whether to send the request mail, the transmission is confirmed, it generates the deletion execution instruction mail for urging the execution of the deletion of the sent e-mail to the second e-mail transmitting and receiving terminals transmitted, the second electronic mail transmission and reception terminal receives the deletion execution instruction mail from the first e-mail sending and receiving terminals, to execute the deletion of the sent e-mail It is characterized by a door.

An eleventh aspect of the invention relates to the e-mail deletion method according to the tenth aspect, wherein when the second e-mail transmitting / receiving terminal receives the deletion request mail, the transmitted e-mail included in the deletion request mail is transmitted. Based on the specific reference information of the e-mail, the corresponding transmitted e-mail is searched from the received e-mails stored in the second storage means, and when the e-mail is specified, the e-mail is identified via the network. The deletion approval mail is transmitted to the first electronic mail transmitting / receiving terminal.

The invention described in claim 12 relates to the e-mail deleting method according to claim 10, wherein when the first e-mail transmitting / receiving terminal receives the deletion approval mail, the deletion request included in the deletion approval mail. Based on the specific reference information of the mail, the corresponding deletion request mail is searched from the transmitted e-mails stored in the first storage means. The deletion execution instruction mail is transmitted to the second e-mail transmission / reception terminal.

The invention according to claim 13 relates to the electronic mail system according to claim 10 , and when the second electronic mail transmitting / receiving terminal receives the deletion execution instruction mail, the deletion included in the deletion execution instruction mail. Based on the specific reference information of the approval mail, the corresponding deletion approval mail is searched from the transmitted e-mails stored in the second storage means. Based on the specific reference information of the included deletion request mail, the corresponding deletion request mail is searched from the received e-mail stored in the second storage means, and when specified, Among the received emails stored in the second storage means based on the specific reference information of the sent email included in the deletion request email Find the corresponding the sent e-mail, when a particular is made, is characterized by performing the deletion of the sent electronic mail.

The invention described in claim 14 relates to the e-mail deletion method according to claim 10, 11 or 13 , wherein the second e-mail transmission / reception terminal at least generates and transmits the deletion approval e-mail. It is characterized by being executed without depending on the instruction operation.

The invention described in claim 15 relates to the e-mail deleting method according to claim 10 or 12 , wherein the first e-mail transmitting / receiving terminal at least generates and transmits the deletion execution instruction mail . It is characterized by being executed regardless of the instruction operation.

According to a sixteenth aspect of the present invention, there is provided an electronic mail deletion program that causes a computer to execute the electronic mail deletion method according to any one of the tenth to fifteenth aspects.

According to the configuration of the present invention, the deletion request mail, the deletion approval mail, and the deletion execution instruction mail are transmitted and received between the transmission side and the reception side electronic mail transmission / reception terminals, and each time the mail identification process is performed, By confirming the target email and the target email, there is no room for the third party to intervene. For example, a malicious third party gives a false deletion instruction to the receiving e-mail transmission / reception terminal, and intentionally deletes it intentionally. Since it is difficult to perform the operation, high safety can be ensured.
Also, the deletion approval mail is not sent to the deletion request mail e-mail transmission / reception terminal, but the e-mail transmission / reception terminal that has sent the e-mail to be deleted. As a result, higher safety can be ensured.

  In addition, the contents of the deletion request mail, the deletion approval mail and the deletion execution instruction mail include the transmission date / time information of the specific target mail, and based on the transmission date / time information, the subject and the transmission source information, By specifying the mail stored in the storage means, especially when sending and receiving e-mail between e-mail sending and receiving terminals connected to a closed network with excellent safety such as a mobile communication network, this In such networks, it is difficult to fake email senders and date / time, so it is highly safe to prevent deletion of undesired emails based on false deletion instructions by spoofing malicious third parties. Sex can be secured.

In addition, the receiving side e-mail transmitting / receiving terminal automatically executes generation, storage and transmission of the deletion approval e-mail without depending on the operator's instruction operation, and the transmitting side e-mail transmitting / receiving terminal, for example, By automatically generating, storing, and transmitting the deletion execution instruction mail without depending on the operator's instruction operation, the corresponding electronic mail can be deleted reliably and accurately.
In addition, for example, the recipient's e-mail transmission / reception terminal automatically generates, stores, and transmits a deletion approval mail without depending on the operator's instruction operation. It is possible to avoid the occurrence of a problem that information is accidentally leaked.

In addition, the mailer is activated between the sending / receiving e-mail sending / receiving terminal and the receiving / receiving e-mail sending / receiving terminal, and the deletion request mail, the deletion approval mail and the deletion execution instruction mail are sent to the normal e-mail. By sending / receiving via the network used for sending / receiving, it is configured to automatically delete the sent e-mail to be deleted. No need for equipment and software for.
In addition, for example, an e-mail can be reliably and accurately deleted without adding a new function for deleting the e-mail to the mail server.
Therefore, an increase in cost can be avoided.

Send and receive deletion request emails, deletion approval emails and deletion execution instruction emails between the sending and receiving email sending and receiving terminals, and confirm the destination and target emails by performing email identification processing each time. For example, it is difficult for a malicious third party to give a false deletion instruction to the recipient's e-mail transmission / reception terminal to cause intentional erroneous deletion. Therefore, the first purpose of ensuring high safety was realized.
In addition, the receiving side e-mail transmitting / receiving terminal automatically executes generation, storage and transmission of the deletion approval e-mail without depending on the operator's instruction operation, and the transmitting side e-mail transmitting / receiving terminal, for example, The second purpose of reliably and accurately deleting the corresponding e-mail is realized by automatically generating, storing, and transmitting the deletion execution instruction mail without depending on the operator's instruction operation.

  1 is a diagram showing a configuration of an electronic mail system according to a first embodiment of the present invention, FIG. 2 is a block diagram showing a configuration of a portable terminal of the electronic mail system, and FIG. 3 is a storage unit of the portable terminal. FIG. 4 is a block diagram showing the configuration of the communication management center of the electronic mail system. FIG. 5 is a block diagram showing the configurations of the information management server, mail server, and connection processing server of the communication management center. 6 and 6 are flowcharts for explaining the operation of the electronic mail system, and FIGS. 7 to 11 are explanatory views for explaining the operation of the electronic mail system.

As shown in FIG. 1, the electronic mail system 1 of this example includes mobile terminals (e-mail transmission / reception terminals) 2a, 2b,... And mobile terminals 2a, 2b,. Is connected to a mobile communication network (network) 3, for example, from a mobile terminal 2 a as the first e-mail transmission source to, for example, a mobile terminal as an e-mail transmission destination via the mobile communication network 3 Used to delete an email addressed to user B sent to 2b at the request of user A;
The mobile communication network 3 can be connected to the Internet 5 via a communication management center 4 managed by the mobile communication carrier X.
In this example, the e-mail addressed to the user B is supplied to the portable terminal 2b via the communication management center 4 and the nearest base station.

  The portable terminal (e-mail transmission / reception terminal) 2a (2b, 2c,...) Has a data communication function that enables transmission / reception of e-mail and browsing of a homepage by connecting to the Internet, for example, in addition to a call function. As shown, the control unit 11a (11b, 11c,...) That controls each component of the mobile phone body and the processing program executed by the control unit 11a (11b, 11c,...) And various data are stored. A wireless communication unit 14a (used for performing communication and data communication according to a predetermined protocol by transmitting and receiving wireless radio waves via the storage unit 12a (12b, 12c,...) And the antenna 13a (13b, 13c,...). 14b, 14c,...) And, for example, the display unit 15a (15 , 15c,..., An operation unit 16a (16b, 16c,...) Composed of a number of various operation keys and the like for inputting numbers and characters, and a transmission unit composed of a microphone for inputting transmitted speech. 17a (17b, 17c,...) And a receiver 18a (18b, 18c,...) Composed of a speaker that outputs the received voice.

The control unit 11a (11b, 11c,...) Includes a CPU (Central Processing Unit) and the like, and executes various processing programs stored in the storage unit 12a (12b, 12c,...) Such as a mailer or a browser. Control each component of the mobile terminal body.
The storage unit 12a (12b, 12c,...) Includes a semiconductor memory such as a ROM and a RAM, and stores various programs executed by the control unit 11a (11b, 11c,...), Various information, and the like.
As shown in FIG. 3, the storage unit 12a (12b, 12c,...) Includes a program storage unit 21a (21b, 21c,...) In which a control program or the like is stored, and an information storage unit 22a (in which various information is stored). 22b, 22c, ...).

The program storage unit 21a (21b, 21c,...) Has a mailer storage area in which mailers are stored. In this example, the mailer as a program used for creating and sending / receiving e-mail includes an e-mail deletion request transmission processing program and e-mail deletion in addition to a processing program for normal e-mail creation / transmission / reception. A request reception processing program.
When the e-mail deletion request transmission processing program receives a transmission mail deletion request by an operation of the user A (B, C,...) Via the operation unit, a procedure for transmitting a deletion request mail to a predetermined portable terminal; When a deletion confirmation mail is received from the predetermined portable terminal, a procedure for returning a deletion execution mail to the portable terminal is described.

When the e-mail deletion request reception processing program receives the deletion request e-mail, the e-mail deletion request reception processing program receives the deletion execution request e-mail from the transmission source portable terminal and the procedure for transmitting the deletion confirmation e-mail to the transmission source portable terminal. It describes a procedure for executing deletion of a sent electronic mail.
The information storage unit 22a (22b, 22c,...) Has a mail information storage area 24a (24b, 24c,...) Processed by the mailer, and the mail information storage area 24a (24b, 24c,...) Has been transmitted. Have a transmitted folder area 25a (25b, 25c,...) For storing the e-mail and a received folder area 26a (26b, 26c,...) For storing the received e-mail.

The display unit 15a (15b, 15c,...) Is composed of a liquid crystal display or the like, and is used for displaying characters and images. For example, the display unit 15a (15b, 15c,...) Displays the content or message of an e-mail received via the communication management center 4. .
As shown in FIG. 4, the communication management center 4 includes an information management server 31 that manages user information and the like, e-mails transmitted from the mobile terminals 2a (2b, 2c,...), And mobile terminals 2 (2b, 2b,. 2c,...)) And a connection processing server 33 for connecting the mobile communication network 3 to the Internet 5, for example.

As shown in FIG. 5, the information management server 31 (mail server 32, connection processing server 33) is composed of a CPU or the like, and controls each component according to a predetermined control program stored in the storage unit 36 (41, 45). Control unit 35 (39, 44), ROM, RAM, FD (flexible disk), HD (hard disk), CD-ROM loaded FDD, HDD, CD-ROM driver, etc. And a storage unit 36 (41, 45) for storing data, a communication unit 37 (42, 46) for performing data communication in accordance with a predetermined protocol, and a keyboard, a mouse, etc. And an operation unit 38 (43, 47) used for inputting information.
In the storage unit 36 of the information management server 31, the current location information of each mobile terminal 2a (2b, 2c,...), User information including the subscriber number and billing information of each user A (B, C,...), Etc. Is stored in a constantly updated state.

Next, the operation of the electronic mail system 1 configured as described above will be described with reference to FIGS.
Hereinafter, when the normal mail M0 is transmitted from the mobile terminal 2a to the mobile terminal 2b, the normal mail M0 via the mail server 32 between the mobile terminal 2a on the transmission side of the normal mail M0 and the mobile terminal 2b on the reception side is sent. The transmission / reception of mail for deletion will be described.
When user A inputs the content of a new normal mail M0 addressed to user B and performs a transmission operation, as shown in FIG. 7, the control unit 11a of the portable terminal 2a transmits the normal mail M0 to the storage unit 12a. While saving in the folder area 25a, the normal mail M0 is transmitted to the portable terminal 2b via the mobile communication network 3 (step ST11 (FIG. 6)).

As a result, the portable terminal 2b receives this normal mail M0 via the mail server 32 (step ST12), and the control unit 11b stores the received normal mail M0 in the received folder area 26b of the storage unit 12b. To do.
When the transmission mail deletion request is received by the operation of the user A via the operation unit 16a after the transmission of the normal mail M0 (step ST13), the control unit 11a, as shown in FIGS. A deletion request mail M1 is generated as an e-mail for requesting deletion to the transmission destination (mobile terminal 2b), and the deletion request mail M1 is stored in the transmitted folder area 25a of the storage unit 12a and moved to the mobile terminal 2b. It transmits via the communication network 3 (step ST14).

That is, when the normal mail M0 is, for example, a false report (content error or destination error), the control unit 11a causes the user A to operate the e-mail stored in the sent folder area 25a of the storage unit 12a. The normal mail M0 desired to be deleted is selected from the above, and the deletion request mail M1 is generated.
Here, the subject of the deletion request mail M1 includes “deletion request” as a character string in order to make it possible to identify the deletion request mail M1, and in this example, the control unit 11a performs the subject of the normal mail M0. The character string “deletion request” is added to the head of the “.
The contents of the deletion request mail M1 include the transmission date / time information of the normal mail M0 desired to be deleted.

When a plurality of destinations of the deletion request mail M1 are set, the control unit 11a deletes only the destinations that do not require the deletion request mail transmission by the operation of the user A, and the normal mail M0 having the correct contents is delivered. The deletion request mail M1 is prevented from being sent to the destination.
That is, when a plurality of destinations of the deletion request mail M1 are set, the control unit 11a displays all the destinations that have transmitted the normal mail M0 on the display unit 15a, and the deletion request mail is selected by the user A's selective deletion operation. Only a destination that does not require transmission is deleted, and a deletion request mail M1 is generated.

When the portable terminal 2b receives the deletion request mail M1 via the mail server 32 (step ST15), the control unit 11b stores the received deletion request mail M1 in the received folder area 26b of the storage unit 12b.
Next, when the control unit 11b confirms that the character string “deletion request” is included in the subject based on the subject included in the received deletion request mail M1, the received electronic mail is the deletion request mail M1. Based on the subject included in the deletion request mail M1 and the transmission date and time information of the normal mail M0 to be deleted, the received normal mail stored in the received folder area 26b of the storage unit 12b is recognized. The corresponding normal mail is searched from and specified as a deletion candidate (step ST16). Here, when it cannot be specified, the processing is stopped.

Next, as shown in FIG. 9, the control unit 11b generates a deletion confirmation mail M2 as an e-mail for accepting the deletion of the specified normal mail M0 to the transmission source (mobile terminal 2a), The deletion confirmation mail M2 is stored in the transmitted folder area 25b of the storage unit 12b and transmitted to the portable terminal 2a (step ST17).
Here, the subject of the deletion confirmation mail M2 includes “deletion confirmation” as a character string so that it can be identified as the deletion confirmation mail M2, and in this example, the control unit 11b performs the subject of the normal mail M0. The character string “deletion confirmation” is added to the head of the character string.
Further, the content of the deletion confirmation mail M2 includes transmission date information of the deletion request mail. The destination of the deletion confirmation mail M2 is the sender (user A) of the specified normal mail M0.
In this example, the control unit 11b automatically executes generation, storage, and transmission of the deletion confirmation mail M2 regardless of the user B instruction operation.

Next, when the portable terminal 2a receives this deletion confirmation mail M2 via the mail server 32 (step ST18), the control unit 11a stores the received deletion confirmation mail M2 in the received folder area 26a of the storage unit 12a. save.
Next, when the control unit 11a confirms that the character string “deletion confirmation” is included in the subject based on the subject included in the received deletion confirmation mail M2, the received electronic mail is the deletion confirmation mail M2. Based on the subject included in the deletion confirmation mail M2, the transmission date and time information of the deletion request mail M1 and the sender information (in this example, the destination (user B) of the deletion request mail M1) The corresponding deletion request mail M1 is searched from the transmitted deletion request mail M1 stored in the transmitted folder area 25a of 12a and specified (step ST19). Here, when it cannot be specified, the processing is stopped.

Next, as shown in FIGS. 10 and 11, the control unit 11a generates a deletion execution mail M3 for prompting the portable terminal 2b to delete the normal mail M0 desired to be deleted, and stores the deletion execution mail M3. The data is stored in the transmitted folder area 25a of the unit 12a and transmitted to the portable terminal 2b via the mobile communication network 3 (step ST20).
Here, the subject of the deletion execution mail M3 includes “deletion execution” as a character string so that it can be identified as the deletion execution mail M3. In this example, the control unit 11a includes the deletion request mail M1. The character string “deletion request” included in the subject is replaced with the character string “deletion execution”.
Further, the content of the deletion execution mail includes the transmission date / time information of the corresponding deletion confirmation mail. The destination of the deletion execution mail M3 is the sender (user B) of the deletion confirmation mail M2.
Further, in this example, the control unit 11a automatically executes generation, storage, and transmission of the deletion execution mail M3 regardless of the user A instruction operation.

Next, when the portable terminal 2b receives the deletion execution mail M3 via the mail server 32 (step ST21), the control unit 11b stores the received deletion execution mail M3 in the received folder area 26b of the storage unit 12b. save.
Next, when the control unit 11b confirms that the character string “delete execution” is included in the subject based on the subject included in the received deletion execution mail M3, the received electronic mail is the deletion execution mail M3. Based on the subject included in the deletion execution mail M3 and the transmission date and time information of the deletion confirmation mail M2, the deletion confirmation mail M2 that has been transmitted and stored in the transmitted folder area 25b of the storage unit 12b is recognized. The corresponding deletion confirmation mail M2 is searched and specified (step ST22). Here, when it cannot be specified, the processing is stopped.

Next, the control unit 11b stores the subject based on the subject included in the identified deletion confirmation mail M2, the transmission date and time information of the deletion request mail M1, and the sender information (user A in this example) of the deletion request mail M1. The corresponding deletion request mail is searched from the received deletion request mail M1 stored in the received folder area 26b of the section 12b and specified (step ST23). Here, when it cannot be specified, the processing is stopped.
Next, based on the subject included in the specified deletion request mail M1, the transmission date and time information of the normal mail M0 as a deletion candidate, and the sender information of the normal mail M0 (user A in this example) The corresponding normal mail is searched from the received normal mail M0 stored in the received folder area 26b of the storage unit 12b and specified (step ST24). Here, when it cannot be specified, the processing is stopped.
Next, the control unit 11b deletes the specified deletion candidate normal mail M0 from the received folder area 26b of the storage unit 12b (step ST25).

As described above, according to the configuration of this example, the deletion request mail M1, the deletion confirmation mail M2, and the deletion execution mail M3 are transmitted and received between the transmitting and receiving portable terminals (one-to-one), and each time. Since the mail identification process is performed and the destination and the target mail are repeatedly confirmed, there is no room for the third party to intervene, for example, a false deletion instruction by impersonation of a malicious third party is received on the receiving side mobile terminal Therefore, it is difficult to intentionally make an erroneous deletion, so that high security can be ensured.
Also, for example, if the destination of the deletion confirmation mail M2 is not the sender of the deletion request mail M1, but the sender of the normal mail M0 to be deleted, and if both senders are different, the deletion process is interrupted as the specific processing is not possible. Therefore, higher safety can be ensured.

  In addition, the contents of the deletion request mail M0, the deletion confirmation mail M2 and the deletion execution mail M3 include the transmission date and time information of the specific target mail, and based on the transmission date and time information, the subject and the transmission source information, Or, since the mail stored in the received folder area is specified, this is particularly necessary when sending and receiving e-mail between mobile terminals connected to a closed network with excellent safety such as a mobile communication network. In such networks, it is difficult to fake email senders and date / time, so it is highly safe to prevent deletion of undesired emails based on false deletion instructions by spoofing malicious third parties. Sex can be secured.

Further, for example, the control unit 11b automatically executes generation, storage and transmission of the deletion confirmation mail M2 without depending on the user B instruction operation, and the control unit 11a generates, stores and stores the deletion execution mail M3. Since the transmission is automatically executed regardless of the instruction operation of the user A, the corresponding electronic mail can be deleted reliably and accurately.
For example, the control unit 11b automatically generates, stores, and transmits the deletion confirmation mail M2 without depending on the user B instruction operation. It is possible to avoid the occurrence of problems such as leakage of information.

In addition, for example, a mailer is activated between the mobile terminal 2a on the transmission side and the mobile terminal 2b on the reception side, and the deletion request mail M1, the deletion confirmation mail M2, and the deletion execution mail M3 are transmitted and received. For example, by transmitting / receiving via the mobile communication network 3 for example, the already sent electronic mail (normal mail) to be deleted is automatically automatically deleted. There is no need for a route, transfer device and software.
In addition, the e-mail can be reliably and accurately deleted without adding a new function for deleting the mail to the mail server 32.
Therefore, an increase in cost can be avoided.
Further, the contents of the deletion request mail M1, the deletion confirmation mail M2 and the deletion execution mail M3 include the transmission date / time information of the specific target mail, and based on the transmission date / time information and the subject, the sent folder area or the received folder Since the mail stored in the area is specified, it is possible to easily specify the mail particularly when handling the Internet mail described up to the second unit as the transmission date and time information.

This example differs greatly from the above-described first embodiment. In the first embodiment, the contents of the deletion request mail, the deletion confirmation mail, and the deletion execution mail include the transmission date / time information of the specific target mail, Based on this, the mail stored in the sent folder area or the received folder area is specified, but the mail body itself is treated as a file and attached to the deletion request mail, the deletion confirmation mail, and the deletion execution mail. The configuration is such that the mail is specified by comparing the attached file and the text of the specific target mail.
Since the other configuration is substantially the same as the configuration of the first embodiment described above, the description thereof is omitted.

According to the configuration of this example, substantially the same effect as that of the first embodiment described above can be obtained.
In addition, it is possible to specify the normal mail as a deletion candidate more accurately.

The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. Are also included in the present invention.
For example, in the above-described embodiment, a case has been described in which a mobile communication network is used as a network, and transmission / reception of electronic mail is performed via this mobile communication network. Further, the present invention can be applied to a case where only a fixed network is used, and can be applied to a case where connection is made to the Internet or a case where connection is not made. Further, the present invention is applicable not only to public lines but also to dedicated lines.

In addition, the case where both the transmission side and the reception side portable terminal have the transmission / reception function of the deletion request mail, the deletion confirmation mail and the deletion execution mail has been described. For example, as the reception side portable terminal, the deletion confirmation mail is transmitted. Recipients by checking the subject of the deletion request email even when using a mobile device that only has a normal email sending / receiving function that does not have a function, a deletion candidate email identification function, an automatic deletion function when receiving a deletion execution email, etc. The objective can be achieved by encouraging manual removal of.
Further, the mail server is not limited to a single one, and a plurality of mail servers may be provided. Alternatively, the mail servers may be centrally arranged or distributed on the network.

Further, the number of e-mails to be deleted at one time is not limited to one per one transmission destination, and may be plural.
Further, even if it is not necessarily a false alarm, for example, a predetermined e-mail deletion request may be made with a time limit.
In addition, when a mail cannot be specified in each step, an electronic mail indicating that processing is interrupted may be returned.

In addition, when sending / receiving a deletion request email, a deletion confirmation email and a deletion execution email, the case where “deletion request”, “deletion confirmation”, and “deletion execution” are included in the subject to specify the type of email was described. However, a character string other than these may be used, and may be included in the text.
In addition, the contents of the deletion request mail, deletion confirmation mail, and deletion execution mail include the transmission date / time information of the specific target mail, and are stored in the sent folder area or the received folder area based on the transmission date / time information and subject. Although the case where the received mail is specified has been described, it may be specified by other information.

  As a portable terminal, in addition to a cellular phone, a simple cellular phone (PHS) terminal having a data communication function, a personal digital assistant (PDA), or a portable computer can be used. Further, as an electronic mail transmission / reception terminal, in addition to a portable terminal, the present invention can be applied when a stationary personal computer or the like is used.

It is a figure which shows the structure of the electronic mail system which is 1st Example of this invention. It is a block diagram which shows the structure of the portable terminal of the same email system. It is a block diagram which shows the structure of the memory | storage part of the portable terminal. It is a block diagram which shows the structure of the communication management center of the same e-mail system. It is a block diagram which shows the structure of the information management server of the same communication management center, a mail server, and a connection processing server. It is a flowchart for demonstrating operation | movement of the same e-mail system. It is explanatory drawing for demonstrating operation | movement of the same email system. It is explanatory drawing for demonstrating operation | movement of the same email system. It is explanatory drawing for demonstrating operation | movement of the same email system. It is explanatory drawing for demonstrating operation | movement of the same email system. It is explanatory drawing for demonstrating operation | movement of the same email system.

Explanation of symbols

1 E-mail system 2a, 2b, ... Mobile terminal (e-mail transmission / reception terminal)
3 Mobile communication network (network)
4 Communication management center 5 Internet 11a, 11b,... Control unit (deletion request mail generation means, deletion execution instruction mail generation means, deletion approval mail generation means)
12a, 12b,... Storage section (first storage means, second storage means, storage means)
32 mail server M0 normal mail (sent e-mail)
M1 deletion request mail M2 deletion confirmation mail (deletion approval mail)
M3 deletion execution mail (deletion execution instruction mail)

Claims (16)

An e-mail system for a first e-mail transmission / reception terminal and a second e-mail transmission / reception terminal to transmit / receive e-mail via a network,
The first e-mail transmission / reception terminal includes:
Upon receiving a transmission mail deletion request for requesting deletion of a transmitted electronic mail transmitted to the second electronic mail transmission / reception terminal via the network, the transmitted electronic mail is sent to the second electronic mail transmission / reception terminal. and delete request mail generating and sending means of generating and transmitting a delete request mail for obtaining the deletion,
When a deletion approval mail for notifying the approval of the deletion of the transmitted electronic mail is received from the second electronic mail transmission / reception terminal, the deletion request mail is transmitted to the second electronic mail transmission / reception terminal before the reception. If the transmission is confirmed, a deletion execution instruction is generated and transmitted to the second e-mail transmission / reception terminal to prompt the execution of deletion of the transmitted e-mail. such and an instruction mail generation and transmission means Rutotomoni,
The second e-mail transmitting / receiving terminal is:
Upon receipt of the deletion request mail requesting deletion of the transmitted email from the first email transmission / reception terminal or the third email transmission / reception terminal , the existence of the transmitted email is confirmed and confirmed. A deletion approval mail generation / transmission unit configured to generate a deletion approval mail and transmit the deletion approval mail to the first e-mail transmission / reception terminal that is a transmission source of the transmitted e-mail, and execute the deletion from the first e-mail transmission / reception terminal; An e-mail system, wherein when the instruction mail is received, the transmitted e-mail is deleted. When the second e-mail transmission / reception terminal receives the deletion request mail, the second e-mail transmission / reception terminal stores the received e-mail stored in the second storage means based on the specific reference information of the transmitted e-mail included in the deletion request e-mail. Searching for the corresponding sent e-mail from among e-mails, and when the e-mail is identified, the deletion approval e-mail is transmitted to the first e-mail transmitting / receiving terminal via the network. The e-mail system according to claim 1 . When the first e-mail transmission / reception terminal receives the deletion approval mail, the first electronic mail transmission / reception terminal stores the transmitted electronic mail stored in the first storage unit based on the specific reference information of the deletion request mail included in the deletion approval mail. The deletion request instruction mail is transmitted to the second electronic mail transmitting / receiving terminal via the network when the corresponding deletion request mail is searched from among the mails and specified. The electronic mail system according to claim 1 . When the second e-mail transmission / reception terminal receives the deletion execution instruction mail, the transmission stored in the second storage means based on the specific reference information of the deletion approval mail included in the deletion execution instruction mail Search the corresponding e-mail for deleting the corresponding e-mail,
When the identification is made, based on the specific reference information of the deletion request mail included in the deletion approval mail, the corresponding deletion request from the received electronic mail stored in the second storage unit Search for email
The transmission corresponding to the received e-mail stored in the second storage means based on the specific reference information of the sent e-mail included in the deletion request e-mail when specified. Search for completed emails,
E-mail system according to claim 1, wherein a when a specific has been made, to the deletion of the sent electronic mail. 5. The electronic mail system according to claim 1 , wherein the second electronic mail transmission / reception terminal executes at least the generation and transmission of the deletion approval mail without depending on an instruction operation by an operator. . The e-mail system according to claim 1 or 3, wherein the first e-mail transmitting / receiving terminal executes at least the generation and transmission of the deletion execution instruction mail without depending on an instruction operation by an operator. An e-mail transmission / reception terminal used in the e-mail system according to claim 1, wherein the e-mail transmission / reception terminal has a function as the first e-mail transmission / reception terminal. . An e-mail transmission / reception terminal used in the e-mail system according to any one of claims 1 to 6, wherein the e-mail transmission / reception terminal has a function as the second e-mail transmission / reception terminal. . An electronic mail transmission / reception terminal used in the electronic mail system according to any one of claims 1 to 6, wherein the electronic transmission / reception terminal has a function as the first and second electronic mail transmission / reception terminals. Mail sending / receiving terminal. An e-mail deletion method in which a first e-mail transmission / reception terminal and a second e-mail transmission / reception terminal perform transmission / reception of e-mails via a network and delete transmitted e-mails,
When the first e-mail transmission / reception terminal receives a transmission mail deletion request for requesting deletion of a transmitted e-mail transmitted to the second e-mail transmission / reception terminal via the network, the first e-mail transmission / reception terminal via the network Generating and sending a deletion request mail for requesting deletion of the transmitted e-mail to the second e-mail transmitting / receiving terminal;
When the second e-mail transmission / reception terminal receives the deletion request e-mail requesting deletion of the transmitted e-mail from the first e-mail transmission / reception terminal or the third e-mail transmission / reception terminal , When the existence is confirmed and confirmed, a deletion approval mail for notifying the approval of the deletion of the transmitted e-mail is generated, and the first e-mail transmission / reception terminal which is the transmission source of the transmitted e- mail is generated. Send
When the first e-mail transmission / reception terminal receives the deletion approval e-mail from the second e-mail transmission / reception terminal, whether or not the first e-mail transmission / reception terminal has transmitted the deletion request e-mail to the second e-mail transmission / reception terminal before the reception. Confirming whether or not the transmission is confirmed, the second e-mail transmission / reception terminal generates and transmits a deletion execution instruction mail for prompting execution of deletion of the transmitted e-mail,
The second e-mail transmission / reception terminal, when receiving the deletion execution instruction mail from the first e-mail transmission / reception terminal, executes deletion of the transmitted e-mail. When the second e-mail transmission / reception terminal receives the deletion request mail, the second e-mail transmission / reception terminal stores the received e-mail stored in the second storage means based on the specific reference information of the transmitted e-mail included in the deletion request e-mail. Searching for the corresponding sent e-mail from among e-mails, and when the e-mail is identified, the deletion approval e-mail is transmitted to the first e-mail transmitting / receiving terminal via the network. The e-mail deletion method according to claim 10 . When the first e-mail transmission / reception terminal receives the deletion approval mail, the first electronic mail transmission / reception terminal stores the transmitted electronic mail stored in the first storage unit based on the specific reference information of the deletion request mail included in the deletion approval mail. The deletion request instruction mail is transmitted to the second electronic mail transmitting / receiving terminal via the network when the corresponding deletion request mail is searched from among the mails and specified. The e-mail deletion method according to claim 10 . When the second e-mail transmission / reception terminal receives the deletion execution instruction mail, the transmission stored in the second storage means based on the specific reference information of the deletion approval mail included in the deletion execution instruction mail Search the corresponding e-mail for deleting the corresponding e-mail,
When the identification is made, based on the specific reference information of the deletion request mail included in the deletion approval mail, the corresponding deletion request from the received electronic mail stored in the second storage unit Search for email
The transmission corresponding to the received e-mail stored in the second storage means based on the specific reference information of the sent e-mail included in the deletion request e-mail when specified. Search for completed emails,
The e-mail deletion method according to claim 10 , wherein deletion of the sent e-mail is executed when the identification is made. 14. The e-mail deletion according to claim 10, 11 or 13, wherein the second e-mail transmission / reception terminal executes at least the generation and transmission of the deletion approval mail without depending on an operator's instruction operation. Method. The e-mail deletion method according to claim 10 or 12, wherein the first e-mail transmission / reception terminal executes at least the generation and transmission of the deletion execution instruction mail without depending on an instruction operation by an operator. . An e-mail deletion program for causing a computer to execute the e-mail deletion method according to any one of claims 10 to 15 .

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