JP4435006B2 - Mail communication method and mail communication server - Google Patents

Description

The present invention relates to a mail communication method and a mail communication server , and more particularly to a mail communication method for eliminating junk mail and a mail communication server using the method.

  2. Description of the Related Art Conventionally, there has been a problem of so-called junk mail in which a large amount of commercial e-mails are sent to a mobile phone with an e-mail function. Such commercial e-mails are sent using fixed software from a fixed terminal such as a personal computer connected to the Internet in order to send a large amount of e-mails at once. Set the address of the mobile phone etc. to the address that represents the sender that is one of the header information of the mail so that it is not easily understood that it is a commercial e-mail. Often sent as a spoofed email as if it were.

In order to eliminate junk e-mails pretending to be e-mails sent from such mobile phones, mobile carriers managing mobile phone communications use the source address of the header information of the e-mail as the mobile phone address. A measure is taken to prevent an e-mail that does not pass through a predetermined route of the mobile communication carrier from being sent through the mail server of the mobile communication carrier (see Non-Patent Document 1, etc., hereinafter). This is called a conventional example.)
“How to prevent spam”, [online], TU-KA Cellular Tokyo, [Search March 17, 2005], Internet <URL: www.tu-ka.co.jp/topics/safemail.html>

  The technology of the above-mentioned conventional example is used as an effective technology for eliminating junk e-mail, but since all e-mails judged to be spoofed mobile phones are eliminated, the junk e-mail is simultaneously carried In some cases, e-mails that are not junk e-mail necessary for telephone users have been eliminated. Specifically, if you are forwarding e-mails sent to your PC's e-mail address to your mobile phone, or registering your mobile phone address as a member of a so-called mailing list and receiving e-mails on the mailing list If you are using a mobile phone, even if the actual source is a mobile phone, it passes through a forwarding server or mailing list server on the Internet. Therefore, it will be excluded by the server of the mobile communication carrier.

The present invention has been made in view of the above circumstances, and provides a mail communication method and a mail communication server using the mail communication method that can distribute necessary electronic mail while eliminating junk mail. Objective.

The mail communication method of the present invention includes a first storage means for storing a character string selected by a user of a communication terminal device corresponding to at least one of known regular business operators, and header information of an electronic mail Among the above, the first designated character string designated by the user of the communication terminal device corresponding to the part of the email address to be the destination, and the header information other than the destination, the source and the subject and a second storage means for the second string specified in correspondence with the portion is stored, using the provided mail communication server as equipment operators communication network by the communication terminal apparatus is connected The mail communication method is executed when the mail communication server receives an e-mail via a communication network other than the carrier communication network. A mail route determination step for the mail communication server to determine whether or not the mail server device passed through is a mail server device managed by the authorized business operator; the result of the determination in the mail route determination step is positive A source address character string determining step for determining whether or not the mail communication server includes the selected character string in a mail address that is a source of the electronic mail; When the determination result in the column determination step is affirmative, the mail communication server does not include the first designated character string in the portion of the mail address that is the transmission destination in the header information of the received electronic mail. and the destination in the received e-mail header information, Do includes the second character string in a portion other than the sender and subject A specific partial character string determining step for determining whether or not; the mail in which the mail communication server delivers the electronic mail to the communication terminal device, except when a positive determination is made in the specific partial character string determining step A mail communication method comprising: a distribution step.

In this mail communication method, first, in the mail path determination step, when the mail communication server receives an e-mail received via a communication network other than the carrier communication network having the mail communication server, the mail communication server The mail communication server determines whether or not the mail server device that has passed last in the route to reach is a mail server device that is managed by a known authorized business operator. Here, whether or not the mail server device is managed last by a known authorized business operator can be determined by checking the server name included in the “Received” tag of the header information of the email .

If the result of the determination in the mail path determination step is affirmative, the mail communication server is selected in advance as the mail address that is the transmission source of the received email in the transmission source address character string determination step. Whether or not a character string is included . As the selected character string, other character strings including the character string representing the domain name of the mail address can be selected.

When the result of the determination in the sender address character string determination step is affirmative, the mail communication server determines whether the mail address that is the transmission destination in the header information of the received email in the specific partial character string determination step It is determined whether or not the first designated character string is included in the portion, and the second character string is not included in the portion other than the transmission destination, transmission source, and subject in the header information of the received electronic mail . Finally, in the mail delivery process, an electronic mail is delivered unless a positive determination is made in the specific partial character string determination process.
Here, “destination” means a character string included in the “To” and “Cc” tags of the header information of the e-mail. For this reason, among the necessary e-mails, the e-mail address that is the destination can be specified. Therefore, by specifying the e-mail address to be transferred or the mail address of the mailing list as the e-mail address of the destination, Mail can be delivered.
“Sender” and “subject” mean character strings included in the “From” and “Subject” tags of the header information of the e-mail, respectively. For this reason, among the necessary e-mails, various information included in the header information of the e-mail can be used. Therefore, even when a complicated condition needs to be specified for the necessary e-mail, the condition is added to the header information. By designating, it is possible to distribute necessary e-mails.

In other words, according to the mail communication method of the present invention, the mail server device that has finally passed through the route up to the mail communication server passes through a predetermined route that is a mail server device managed by the authorized business operator. In other words, in the case of an e-mail sent from a legitimate user of the e-mail address, the e-mail is distributed, and even if it does not go through a predetermined route, it is selected as the e-mail sender address If no character string is included, it is delivered. In addition, even when the specified route is not included and the selected character string is included in the e-mail source address, the e-mail header information specifies the e-mail address part to be sent to by the user. If the first specified character string is included, or if the second character string specified by the user is included in a portion other than the transmission destination, transmission source, and subject in the header information of the e-mail, the message is distributed. Therefore, according to the mail communication method of the present invention, e-mails sent with the e-mail address including the selected character string as a sender are excluded in principle, and the characters designated in the specific part are exceptionally excluded. E-mail containing a column, for example, an e-mail that contains a character string specified in a specific part via a forwarding mail server or mailing list server from a legitimate user of a mail address containing a selected character string Can be distributed and the convenience of the user can be improved.

The mail communication method of the present invention may further include a mail discarding step of discarding the electronic mail when a positive determination is made in the specific partial character string determination step . The meaning of “discard” here not only means that the electronic mail data is discarded from the storage device, but also includes not notifying the sender that the electronic mail has not been delivered. Therefore, by discarding unnecessary e-mails, not only do not deliver e-mails, but also those who send falsely that the user of the e-mail address containing the selected character string is the sender The same junk mail can be prevented from being sent by notifying the error and assuming that it has been delivered.

  In the mail communication method of the present invention, the selected character string can be a domain name related to a mobile communication carrier. Therefore, it is possible to receive necessary e-mails while excluding e-mails that are falsely transmitted from terminals associated with mobile communication carriers.

Further, in the mail communication method of the present invention, the distribution destination of the electronic mail distributed by the mail distribution step can be a mobile communication terminal device. Therefore, the user of the mobile communication terminal device can exclude a mail that is fake from the mail address including the selected character string as a transmission source, and designate a character string of a specific part for a necessary electronic mail. Can be distributed.

The mail communication server of the present invention is a mail communication server arranged as a facility of a business operator communication network to which a communication terminal device is connected, and the user of the communication terminal device can First storage means for storing a character string selected corresponding to at least one; by a user of the communication terminal device corresponding to a mail address portion to be a transmission destination in header information of the electronic mail A second storage means for storing a first designated character string designated and a second designated character string designated corresponding to a portion other than a transmission destination, a transmission source and a subject in the header information ; Determine whether the mail server device that was last passed in the route until the e-mail received via a communication network other than the article trader's communication network is not a mail server device managed by the authorized business operator E-mail path determination means; if the result of the determination by the e-mail path determination means is affirmative, it is determined whether or not the selected character string is included in the e-mail address that is the sender of the e-mail A source address character string judging means to perform;
When the result of the determination by the source address character string determination means is affirmative, the first designated character string is not included in the part of the mail address that is the transmission destination in the header information of the received electronic mail, And specific partial character string determination means for determining whether or not the second character string is included in a portion other than the transmission destination, transmission source, and subject in the header information of the received electronic mail ; and the specific partial character string determination A mail communication server comprising: mail distribution means for distributing the electronic mail to the communication terminal device, except when a positive determination is made by the means.

The meanings of terms and the like in this mail communication server are the same as those in the above-described mail communication method. Therefore, according to the mail communication server of the present invention, the e-mails sent with the e-mail address including the selected character string as a sender are excluded in principle, and the characters designated in the specific part are exceptionally excluded. E-mail containing a column, for example, an e-mail that contains a character string specified in a specific part via a forwarding mail server or mailing list server from a legitimate user of a mail address containing a selected character string Can be distributed and the convenience of the user can be improved.

The mail communication server according to the present invention may further include mail discarding means for discarding the electronic mail when a positive determination is made by the specific partial character string determination means . The meaning of “discard” here is used in the same meaning as in the mail communication method described above. Therefore, by discarding unnecessary e-mails, not only do not deliver e-mails, but also notify users who have falsely sent mail addresses that include the selected character string. First, it is possible to prevent the same spam mail from being transmitted by making the user think that it has been delivered, and to improve the convenience for the user.

As described above, according to the mail communication method and the mail communication server of the present invention, the junk e-mail transmitted with the e-mail address including the selected character string as a sender is excluded in principle, and exceptional. The e-mail including the character string designated in the specific part can be distributed, and the convenience of the user can be improved.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. In these drawings, the same or equivalent elements are denoted by the same reference numerals, and redundant description is omitted. In the following description, an e-mail that can be transmitted to and received from a mobile communication terminal or a fixed terminal via the Internet is referred to as “E-mail”.

FIG. 1 schematically shows a configuration of a communication network system 100 that is an embodiment including a mail communication server of the present invention. As shown in FIG. 1, this communication network system 100 is (a) a mobile communication terminal device having an e-mail transmission / reception function, and a mobile phone whose e-mail address is “keitai10@carrier40.ne.jp”. 10, (b) a mobile phone 20 that also has an e-mail transmission / reception function and transmits an e-mail address “keitai20@carrier21.ne.jp”, and (c) the mobile phone 10 A fixed terminal 32 for transmitting a mail with the sender address of the mail header being false as “keitai20@carrier21.ne.jp” of the mobile phone 20, (d) the Internet network 30, and (e) wireless communication with the mobile phone 10. And (f) a wireless communication between the mobile phone 20 and a mobile phone 20 having a provider function for connecting to the Internet network 30, and a professional for connecting to the Internet network 30. The carrier B mobile network 21 having the IDA function and (g) the fixed terminal 32 are mail server devices having a provider function for connecting to the Internet network 30, and the destination e-mail address is set to “keitai10 @ provider31. When the e-mail “ne.jp” is received, the provider server 31 having a function of forwarding to the e-mail address “keitai10@carrier40.ne.jp” of the mobile phone 10, and (h) the destination When an email with the email address “information@ml.provider33.ne.jp” is received, the email is sent to the email address of the mobile phone 10 and other registered email addresses, so-called And a mailing list server 33 which is a mail server device having a mailing list function.

  Here, the A operator mobile network 40 includes a base station 41 that performs direct wireless communication with the mobile phone 10, and an A operator server 50 that is a mail server for connecting to the Internet network 30. The B operator mobile network 21 includes a base station 22 that performs direct wireless communication with the mobile phone 10 and a B operator server 23 that is a mail server for connecting to the Internet network 30. In the following description, among the emails received by the business operator server 50, the email address included in the “From” tag of the header information of the email is the address managed by the business operator B, and the business operator B An e-mail that has not been transmitted directly from the server 23 to the A operator server 50 is defined as an “spoofed” mail regardless of whether or not the transmission source is fake.

  FIG. 2 schematically shows an external configuration of the mobile phone 10. As shown in FIG. 2, the mobile phone 10 includes (i) an operation unit 12 having a numeric keypad for inputting a telephone number and function keys for inputting various commands such as switching of an operation mode; ii) Display device 13 for displaying operation guidance and operation status of the mobile phone 10 and displaying created emails and received emails; and (iii) playing back audio signals sent from the communication partner during a call. A speaker for call 14, (iv) a microphone 15 for inputting sound at the time of sound collection, or for inputting sound at the time of a call, and (v) a speaker for guidance 16 for generating a ringtone or a guide sound. (Vi) An antenna 17 for performing wireless communication with the base station 41 is provided. The mobile phone 20 has the same configuration as the mobile phone 10.

  FIG. 3 schematically shows a control system inside the A company server 50. The A operator server 50 is a control unit 52 that performs overall control of the system, an Internet network transmission / reception unit 51 that performs communication with the Internet network 30, and an A company network transmission / reception that performs communication with the A operator mobile network 40. Part 53.

  Here, the control unit 52 is temporarily stored in (a) an e-mail temporary storage unit 54 that temporarily stores e-mails received mainly from the Internet 30 and (b) mainly e-mail temporary storage unit 54. It is determined whether or not the e-mail is to be distributed to each mobile phone, and the e-mail is distributed via the mail distribution management unit 55 for managing the distribution of the e-mail, and (c) the A carrier network transmitting / receiving unit 53 and the base station 41. An e-mail distribution unit 56 that distributes e-mail to the telephone 10 is provided.

  Further, the mail delivery management unit 55 includes: (i) an email path determination unit 61 that determines whether the temporarily stored email is directly transmitted from the B operator server 23; A source address determination unit 65 for determining whether or not a character string of a domain name selected in advance is included in the contents of the “From” tag representing the source address included in the header information of the temporarily stored email; (Iii) a header character string determination unit 62 for determining whether or not a character string of a list registered in advance is included in the specific part of the header information of the temporarily stored e-mail; and (iv) temporarily stored An e-mail deleting unit 63 that deletes the e-mail from the e-mail temporary storage unit 54;

  Here, the source address determination unit 65 includes a spoofed domain name list 66 that is a character string list of the previously selected domain names. The header character string determination unit 62 includes a repair list 64 that is a previously registered list.

  Next, a mail communication method in the A company server 50 of the communication network system 100 configured as described above will be described.

  FIG. 4 shows the transition of the screen displayed on the display device 13 of the mobile phone 10 for the user of the mobile phone 10 to set the impersonation domain name list 66 and the relief list 64. First, in the screen 71 of FIG. 4, the user sets the radio button of the B operator to “Do Not Receive” in order to exclude the email transmitted as the B operator's mobile phone, Transition to screen 72.

  Remedy list 1 so that the forward mail used by the user can be received among the emails that are determined to be emails impersonating the mobile phone of the carrier B on screen 72. Enter the character string “keitai10@provider31.ne.jp” in the field, and set the radio button to “forwarding / mailing list”. Next, enter the text string “provider33” in the Remedy List 2 field and set the radio button to “Free Word in Header” so that you can also receive emails from the mailing list used by the user. Press the enter button.

  By setting these screens, “carrier21.ne.jp”, which is the domain name of the email address of the mobile phone of the carrier B, is selected and registered in the spoofed domain name list 66. As shown in FIG. 5, the relief list includes a first area (specification) in which character strings included in the “To” and “Cc” tags that are transmission destinations among the tags included in the header information of the email are specified. Part) and a second area for specifying a character string of header information other than information included in a “From” tag as a transmission source, a “To” / “Cc” tag as a transmission destination, and a “Subject” tag as a subject It is divided into (specific parts). By the screen transition operation shown in the screen 72 of FIG. 4, the character string “keitai10@provider31.ne.jp” is specified in the first area and the character string “provider33” is specified in the second area. And registered.

  FIG. 6 shows a sequence diagram for processing of the A company server 50 when an e-mail is directly transmitted from the mobile phone 20 to the mobile phone 10. After the setting shown in FIG. 4, when the user of the mobile phone 20 creates an e-mail with the mobile phone 20 and transmits the e-mail as the destination, the e-mail is sent to the B operator server 23 and the Internet network 30. To the A company server 50. The transmitted e-mail is received by the Internet network transmission / reception unit 51 of the A company server 50 and temporarily stored in the e-mail temporary storage unit 54. The temporarily stored email temporary storage unit 54 requests the email path determination unit 61 to determine the mail path.

  The e-mail route determination unit 61 that has received the determination request performs an e-mail route determination process S10. As shown in FIG. 7, the e-mail route determination process S10 first confirms whether or not the e-mail path determination process S10 is directly received from the B carrier server 23 in step S11. In the present embodiment, of the information indicated in the “Received” tag of the header information of the email, the information indicating the mail server that has passed through the last includes the character string “carrier 23” indicating that it is the B carrier server. Judging by whether or not.

  In the case of the sequence of FIG. 6, since it is directly transmitted from the carrier B server 23, among the information indicated by the “Received” tag, the character “carrier 23” In step S11, a positive determination is made. Accordingly, the process proceeds to step S13 in FIG. 7, a distribution request is made to the e-mail distribution unit 56, and the e-mail route determination process S10 is terminated. Returning to FIG. 6, the e-mail delivery unit 56 requested to deliver takes out the e-mail from the e-mail temporary storage unit 54 and delivers it to the mobile phone 10.

  FIG. 8 shows a sequence diagram in the case of transmission from the fixed terminal 32 to the mobile phone 10. In the header information of the email, the transmission source address is the domain name of the carrier B “carrier21.ne ".jp" has been sent falsely to include the character string. First, in the fixed terminal 32, when an e-mail with a false source address is created and the e-mail is transmitted to the mobile phone 10, the e-mail is transmitted to the A operator server 50 via the provider server 31 and the Internet network 30. The

  The transmitted E-mail is received by the Internet network transmission / reception unit 51 of the A company server 50 and temporarily stored in the E-mail temporary storage unit 54 as in the case of the sequence diagram of FIG. The temporarily stored e-mail storage unit 54 requests the e-mail path determination unit 61 to send an e-mail path determination process S10. The e-mail route determination unit 61 that has received the determination request performs an e-mail route determination process S10. As shown in FIG. 7, the e-mail route determination process S10 first confirms whether or not the e-mail path determination process S10 is directly received from the B carrier server 23 in step S11.

  In the case of the sequence in FIG. 8, since it is transmitted from the provider server 31, among the information indicated by the “Received” tag, the character string “carrier 23” is included in the information indicating the mail server that has passed through last. Not included, a negative determination is made in step S11, and the process proceeds to step S12. In step S12, a transmission source address determination request is made.

  Returning to FIG. 8, the transmission source address determination unit 65 that has received the transmission source address determination request performs a transmission source address determination process S <b> 30. As shown in FIG. 9, the source address determination process S30 determines whether there is a character string registered in the spoofed domain name list 66 in the character string in the “From” tag of the header information of the email in step S31. Whether it is determined. Here, the character string in the “From” tag includes “carrier21.ne.jp”, and since the same character string “carrier21.ne.jp” is registered in the spoofed domain name list 66, it is positive. Determination is made and the process proceeds to step S32. In step S32, a header character string determination request is made. On the other hand, if a negative determination is made in step S31, a distribution request is made as in step 13 of FIG.

  Returning to FIG. 8, when a header character string determination request is made, the header character string determination unit 62 performs a header character string determination process S20. In step S21, the header character string determination process S20 is registered in the first area of the relief list 64 in the information included in the “To” and “Cc” tags of the header information of the email in step S21. It is determined whether or not the specified character string is included. Here, the information included in the “To” and “Cc” tags of the email is only “keitai10@carrier40.ne.jp”, and the character string stored in the first area is “keitai10@provider31.ne.jp”. Therefore, a negative determination is made.

  Therefore, the process proceeds to step S22 in FIG. 10, and the character string registered in the second area of the repair list 64 is added to the header information other than the information included in the “From”, “To”, “Cc”, and “Subject” tags. Whether or not is included. Here, since the information stored in the second area is “provider33” and is not included in the header information of the email, a negative determination is also made in step 22, and the process proceeds to step S 23. Is requested to be deleted. Returning to FIG. 8, the e-mail deletion unit 63 requested to delete deletes the e-mail temporarily stored in the e-mail temporary storage unit 54.

  FIG. 11 is a sequence diagram showing processing when the mobile phone 20 transmits to the e-mail address “keitai10@provider31.ne.jp”. First, the mobile phone 20 creates an e-mail and transmits the e-mail with the destination address “keitai10@provider31.ne.jp”. The e-mail is received by the provider server 31 via the B operator server 23 and the Internet network 30. As previously set, the provider server 31 changes the transmission destination to “keitai10@carrier40.ne.jp” and transfers the e-mail to the mobile phone 10. Here, at the time of forwarding, the content of the “To” tag in the header information of the email is not changed, and remains “keitai10@provider31.ne.jp”, and in the area called the envelope (not shown) "Keitai10@carrier40.ne.jp", which is the transmission destination address, is described and transmitted.

  The transferred e-mail is transmitted to the A company server 50 via the Internet network 30 again. The transmitted E-mail is received by the Internet network transmission / reception unit 51 of the A company server 50 and temporarily stored in the E-mail temporary storage unit 54 as in the case of the sequence diagram of FIG. The temporarily stored e-mail temporary storage unit 54 requests the e-mail path determination process S10, and the e-mail path determination unit 61 that receives the determination request performs the e-mail path determination process S10. As shown in FIG. 7, the e-mail route determination process S10 first confirms whether or not the e-mail path determination process S10 is directly received from the B carrier server 23 in step S11.

  In the case of the sequence of FIG. 11, since it is finally transmitted from the provider server 31, among the information indicated by the “Received” tag, the information indicating the mail server that has passed through lastly includes “carrier 23”. The character string is not included and a negative determination is made in step S11, and the process proceeds to step S12. In step S12, a transmission source address determination request is made.

  Returning to FIG. 11, the transmission source address determination unit 65 that has received the transmission source address determination request performs a transmission source address determination process S <b> 30. As shown in FIG. 9, the source address determination process S30 determines whether there is a character string registered in the spoofed domain name list 66 in the character string in the “From” tag of the header information of the email in step S31. Whether it is determined. Here, the character string in the “From” tag is “keitai20@carrier21.ne.jp”, which includes the character string “carrier21.ne.jp” registered in the spoofed domain name list 66. Determination is made, and the process proceeds to step S32. In step S32, a header character string determination request is made.

  Returning to FIG. 11, when a determination request for a header character string is made, the header character string determination unit 62 performs a header character string determination process S20. In step S21, the header character string determination process S20 is registered in the first area of the relief list 64 in the information included in the “To” and “Cc” tags of the header information of the email in step S21. It is determined whether or not the specified character string is included. Here, the information included in the “To” and “Cc” tags of the email is “keitai10@provider31.ne.jp”, and the character string stored in the first area is “keitai10@provider31.ne.jp”. Therefore, they agree with each other and a positive determination is made in step S21.

  If a positive determination is made in step S21, the process proceeds to step S24, and a distribution request is made. Returning to FIG. 11, the e-mail delivery unit 56 requested to deliver takes out the e-mail from the e-mail temporary storage unit 54 and delivers it to the mobile phone 10.

  FIG. 12 is a sequence diagram showing processing when the mobile phone 20 transmits to the e-mail address “information@ml.provider33.ne.jp”. First, in the mobile phone 20, an e-mail is created, and the e-mail is transmitted with the destination address “information@ml.provider33.ne.jp”. The e-mail is received by the mailing list server 33 via the B operator server 23 and the Internet network 30. The mailing list server 33 transmits an e-mail using “keitai10@carrier40.ne.jp”, which is one of transmission lists registered in advance, as a transmission destination. Here, at the time of transmission, the content of the “To” tag in the header information of the email is not changed and remains “information@ml.provider33.ne.jp”, and is not shown in an area called an envelope (not shown). “Keitai10@carrier40.ne.jp”, which is the actual destination address, is described. Similarly, in the header information, a “Received” tag is added and “provider33.com” is described so as to indicate that the mail has passed through the mailing list server 33.

  The transmitted E-mail is received by the Internet network transmission / reception unit 51 of the A company server 50 via the Internet network 30 again, as in the sequence diagram of FIG. Saved. The temporarily stored e-mail temporary storage unit 54 requests the e-mail path determination process S10, and the e-mail path determination unit 61 that receives the determination request performs the e-mail path determination process S10. As shown in FIG. 7, the e-mail route determination process S10 first confirms whether or not the e-mail route determination process S10 has been received directly from the B carrier server 23 in step S11.

  In the case of the sequence of FIG. 12, since it is finally transmitted from the mailing list server 33, the information indicating the mail server that has passed through in the information indicated by the “Received” tag includes “carrier 23”. The character string is not included and a negative determination is made in step S11, and the process proceeds to step S12. In step S12, a transmission source address determination request is made.

  Returning to FIG. 12, the transmission source address determination unit 65 that has received the transmission source address determination request performs a transmission source address determination process S <b> 30. As shown in FIG. 9, the source address determination process S30 determines whether there is a character string registered in the spoofed domain name list 66 in the character string in the “From” tag of the header information of the email in step S31. Whether it is determined. Here, the character string in the “From” tag is “keitai20@carrier21.ne.jp”, which includes the character string “carrier21.ne.jp” registered in the spoofed domain name list 66. Determination is made, and the process proceeds to step S32. In step S32, a header character string determination request is made.

  Returning to FIG. 12, when a determination request for a header character string is made, the header character string determination unit 62 performs a header character string determination process S20. As shown in FIG. 10, the header character string determination processing S20 stores the information included in the “To” and “Cc” tags of the header information of the email in the first area of the relief list 64 in step S21. It is determined whether or not the specified character string is included. Here, the information included in the “To” and “Cc” tags of the email is “information@ml.provider33.ne.jp”, and the character string stored in the first area is “keitai10@provider31.ne.jp”. Therefore, the character string stored in the first area is not included in the “To” and “Cc” tags of the email, and a negative determination is made in step S21.

  If a negative determination is made in step S21, the process proceeds to step S22. In step S22, the character string stored in the second area of the relief list 64 is included in the header information other than the information of the “From”, “To”, “Cc”, and “Subject” tags of the header information of the email. Determine whether or not. Here, the information stored in the second area is “provider33”, and “Received” tag in the header information of the e-mail describes “provider33.com” attached when the mailing list server 33 is passed. Therefore, the “proveder33” of the information stored in the second area is included in the header information other than the “From”, “To”, “Cc”, and “Subject” tag information, and a positive determination is made. Is done.

  If a positive determination is made in step S22, the process proceeds to step S24, and a distribution request is made. Returning to FIG. 11, the e-mail delivery unit 56 requested to deliver takes out the e-mail from the e-mail temporary storage unit 54 and delivers it to the mobile phone 10.

  As described above, in the present embodiment, when an e-mail is transmitted directly from the mobile phone 20 shown in FIG. 6 to the mobile phone 10, the e-mail route determination unit 61 directly from the B operator server 23. It determines with it being the E-mail transmitted to A provider server 50, and performs a distribution request. Upon receiving the distribution request, the e-mail distribution unit 56 distributes the e-mail to the mobile phone 10.

  Also, as shown in FIG. 8, when the transmission source address is assumed to be the mobile phone 20 and transmitted from the fixed terminal 32, the e-mail route determination unit 61 directly transmits the A operator from the B operator server 23. It judges that it is not the email transmitted to the server 50, and requests | requires determination further from the transmission source address determination part 65. FIG. When the source address determination unit 65 determines that the character string registered in the impersonation domain name list 66 is included in the “From” tag of the header information of the email, the transmission source address determination unit 65 requests further determination from the header character string determination unit 62. To do. When the header character string determination unit 62 determines that there is no character string registered in the relief list 64 in the header information of the email, the header character string determination unit 62 requests deletion of the email. The e-mail deleting unit 63 requested to delete the e-mail deletes the e-mail.

  As shown in FIG. 11, when the email transmitted from the mobile phone 20 is transferred by the provider server 31 and transmitted to the mobile phone 10, the email route determination unit 61 It is determined that the email is not directly transmitted from the server 23 to the A provider server 50, and a further determination is requested to the transmission source address determination unit 65. When the source address determination unit 65 determines that the character string registered in the impersonation domain name list 66 is included in the “From” tag of the header information of the email, the transmission source address determination unit 65 requests further determination from the header character string determination unit 62. To do. When the header character string determination unit 62 determines that the character string of the email address of the provider server 31 registered in the rescue list 64 is present in the “To” tag of the header information of the email, the distribution request is issued. Do. Upon receiving the distribution request, the e-mail distribution unit 56 distributes the e-mail to the mobile phone 10.

  In addition, as shown in FIG. 12, when the email transmitted from the mobile phone 20 is transferred by the provider server 31 and transmitted to the mobile phone 10, the email path determination unit 61 It is determined that the email is not directly transmitted from the server 23 to the A provider server 50, and a further determination is requested to the transmission source address determination unit 65. When the source address determination unit 65 determines that the character string registered in the impersonation domain name list 66 is included in the “From” tag of the header information of the email, the transmission source address determination unit 65 requests further determination from the header character string determination unit 62. To do. When the header character string determination unit 62 determines that there is a character string of the server name of the mailing list server 33 registered in the relief list 64 in the “Received” tag of the header information of the email, it makes a distribution request. . Upon receiving the distribution request, the e-mail distribution unit 56 distributes the e-mail to the mobile phone 10.

  Therefore, according to the present embodiment, the user of the mobile phone 10 is an e-mail whose source is an address including the domain name of the B operator, and the E that has passed through the mail server other than the B operator last. As for email, in principle, it is eliminated as spoofed mail, and necessary emails from the forwarding mail server and mailing list server specified in the relief list are delivered, so that convenience for users can be improved. .

  In this embodiment, since the selected character string is a character string registered in the spoofed domain name list 66 and is the domain name of the mail address of the mobile phone, the user can use the terminal associated with the mobile communication carrier. It is possible to receive necessary e-mails while excluding e-mails pretending to be e-mails sent from.

  In the present embodiment, the specific part is the content of the “From” tag that is the destination mail address in the header information of the email, and the mail address to be transferred is specified. E-mails sent to e-mail addresses can be received.

  In the present embodiment, the specific parts are the contents of the “To” and “Cc” tags that are the transmission destination, the “From” tag that is the transmission source, and the “Subject” tag that is the subject of the email header information. Since a part of the mailing list server name is specified, the user can receive an email transmitted to the mailing list address.

  In the present embodiment, the distribution destination of the distributed e-mail is the mobile phone 10 which is a mobile communication terminal device, and the character string specified in advance is specified by the user of the mobile phone 10, so it is impersonated. Mail can be excluded, and necessary e-mail can be received by designating a character string of a specific part.

In the above embodiment, the mail communication server is arranged in the communication network of the mobile communication carrier, but may be arranged in the carrier communication network other than the mobile communication carrier. Good.

In the embodiment described above, the mail communication server is set to be implemented by a single apparatus, it may be implemented by a plurality of devices.

  In the above embodiment, in order to receive an email transmitted from the mailing list server 33, “provider33”, which is a part of the server name of the mailing list server, is registered in the second area of the relief list. The mailing list email address “information@ml.provider33.ne.jp” may be registered in the first area of the relief list.

  In the above embodiment, the e-mail that is determined not to be distributed is deleted. However, it may be returned to the e-mail address that is the transmission source that the e-mail is not distributed.

  Further, in the above-described embodiment, the specific part of the email is divided into the areas of the header information transmission destination tags “To” and “Cc”, the header information transmission source tag “From”, the transmission destination tags “To” and “Cc”. ”And an area other than the subject tag“ Subject ”, but other header information or an information portion included in other emails such as an envelope information portion indicating an actual destination of the email may be used. .

  In the above embodiment, the e-mails subject to the relief list are the e-mails transmitted by the forwarded e-mails and the mailing list, but via the so-called web mail or other server device transmitted from the web server. Of course, the e-mails that are sent can also be included in the relief list.

  In the above embodiment, the e-mail is transmitted from a fixed terminal that pretends to be the e-mail address of the mobile phone. However, when the e-mail address of a terminal device other than the mobile phone is pretending to be the sender. Can also be used by changing the selected mail address.

As described above, the mail communication method and mail communication server of the present invention can be applied to a mail communication system.

1 is a diagram schematically showing a communication network system 100 as an embodiment including a mail communication server of the present invention. FIG. It is a figure which shows schematically the external appearance structure of the mobile telephone 10 of FIG. It is a figure which shows schematically the control system inside the A provider server 50 of FIG. It is a figure which shows the screen transition at the time of registering a character string to the impersonation domain name list | wrist 66 and relief list | wrist 64 shown by FIG. It is a figure which shows the data structure of the relief list 64 of FIG. It is a sequence diagram showing the process of A provider server 50 when E-mail is directly transmitted from B provider server 23 of FIG. It is a flowchart for demonstrating the email path | route determination process S10 of FIG. It is a sequence diagram showing the process of the A provider server 50 when the email which spoofed the transmission source address is transmitted from the provider server 31 of FIG. It is a flowchart for demonstrating the transmission source address determination process S30 of FIG. It is a flowchart for demonstrating the header character string determination process S20 of FIG. It is a sequence diagram showing the process of A provider server 50 when the email transmitted by the provider server 31 of FIG. 1 is transmitted. It is a sequence diagram showing the process of the A provider server 50 when E-mail is transmitted from the mailing list server 33 of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10, 20 ... Mobile phone, 12 ... Operation part, 13 ... Display apparatus, 14 ... Speaker for call, 15 ... Microphone, 16 ... Speaker for guidance, 17 ... Antenna, 21 ... B carrier mobile network, 22 ... Base station, 23 ... B operator server, 30 ... Internet network, 31 ... provider server, 32 ... fixed terminal, 33 ... mailing list server, 40 ... A operator mobile network, 41 ... base station, 50 ... A operator server, 51 ... Internet Network transmission / reception unit 52 ... Control unit 53 ... A carrier network transmission / reception unit 54 ... E-mail temporary storage unit 55 ... E-mail distribution management unit 56 ... E-mail distribution unit (mail distribution means) 61 ... E-mail Route determination unit (mail route determination unit), 62 ... header character string determination unit (specific partial character string determination unit), 63 ... email deletion unit, 64 ... relief list, 65 ... source address Determination unit (source address string determination means), 66 ... spoofed domain name list, 100 ... communication network system.

Claims (6)

The first storage means for storing a character string selected corresponding to at least one of the known legitimate operators by the user of the communication terminal device , and the transmission destination of the header information of the e-mail The first designated character string designated by the user of the communication terminal device corresponding to the mail address part, and the header information, designated in correspondence with the parts other than the transmission destination, the transmission source and the subject in a second and a storage means, the mail communication method of the communication terminal apparatus is performed using disposed mail communication server as equipment operators communication network connected to the second string is stored There,
When the mail communication server receives an e-mail via a communication network other than the carrier communication network, the mail server device that has passed through the route to reach the mail communication server is the regular carrier. A mail path determination step for the mail communication server to determine whether or not the mail server device is managed by the mail communication server;
If the result of the determination in the mail path determination step is affirmative, the mail communication server determines whether or not the mail address that is the sender of the e-mail includes the selected character string A sender address character string determination step;
When the result of the determination in the source address character string determination step is affirmative, the mail communication server uses the first designation in the part of the mail address that is the transmission destination in the header information of the received electronic mail. A specific partial character string determination step of determining whether or not the second character string is included in a portion other than a transmission destination, a transmission source, and a subject in the header information of the received e-mail ;
A mail distribution step in which the mail communication server distributes the electronic mail to the communication terminal device, except when a positive determination is made in the specific partial character string determination step;
An e-mail communication method comprising:   The mail communication method according to claim 1, further comprising a mail discarding step of discarding the electronic mail when a positive determination is made in the specific partial character string determination step.   The mail communication method according to claim 1 or 2, wherein the selected character string is a domain name related to a mobile communication carrier. The mail communication method according to any one of claims 1 to 3 , wherein a delivery destination of the mail delivered by the mail delivery step is a mobile communication terminal device. A mail communication server arranged as a facility of a carrier communication network to which a communication terminal device is connected,
First storage means for storing a character string selected by a user of the communication terminal device in correspondence with at least one of known regular business operators;
Of the header information of the e-mail, the first designated character string designated by the user of the communication terminal device corresponding to the part of the mail address that is the destination, and the destination information, the transmission of the header information Second storage means for storing a second designated character string designated corresponding to a portion other than the original and subject ;
Mail for determining whether or not the mail server device that has been lastly routed in the route until the e-mail received via a communication network other than the carrier communication network is not a mail server device managed by the authorized carrier Route determination means;
If the result of the determination by the mail path determination means is affirmative, a sender address character string determination that determines whether or not the selected character string is included in the mail address that is the sender of the electronic mail Means;
When the result of the determination by the source address character string determination means is affirmative, the first designated character string is not included in the part of the mail address that is the transmission destination in the header information of the received electronic mail, And specific partial character string determination means for determining whether or not the second character string is included in a portion other than the transmission destination, transmission source, and subject in the header information of the received electronic mail ;
Mail distribution means for distributing the electronic mail to the communication terminal device, except when a positive determination is made by the specific partial character string determination means;
A mail communication server characterized by comprising: The mail communication server according to claim 5 , further comprising: a mail discarding unit that discards the electronic mail when a positive determination is made by the specific partial character string determination unit.

Images