JP2009187339A - E-mail apparatus, e-mail system, e-mail inspection method and e-mail inspection program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To discriminate the inspection object part and inspection exempt part of e-mail. <P>SOLUTION: An e-mail apparatus is provided with an inspection object discrimination part for discriminating the inspection object part and the inspection exempt part when inspecting whether or not secret information is included in the e-mail, and a secret information inspection part for inspecting whether or not the secret information is included in the inspection object part. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electronic mail device, an electronic mail system, an electronic mail inspection method, and an electronic mail inspection program. In particular, the present invention relates to an electronic mail apparatus, an electronic mail system, an electronic mail inspection method, and an electronic mail inspection program for discriminating a portion to be inspected and a portion not to be inspected.

  When sending an e-mail, there is a need to perform confidential information inspection (eg, personal information inspection) of the contents including the mail text, to detect confidential information (eg, personal information) and prevent leakage in advance. .

  Patent Document 1 discloses a character string inspection device that inspects character data when an e-mail is transmitted, and detects secret leakage or slander in advance. In addition, as a document related to the present invention, Patent Document 2 is a network printing system that excludes a signature included in a mail body from a print target, and Patent Document 3 is a personal information extraction that automatically extracts personal information from a signature unit. An apparatus is disclosed.

JP 2004-227056 A JP-A-9-244969 JP 2007-047917 A

  Since the character string inspection device described in Patent Document 1 described above makes the entire body of an e-mail subject to inspection, it should be determined that there is no confidential information without detecting confidential information. There was a problem that it was determined that there was confidential information. For example, the character string inspection device described in Patent Document 1 has a problem in that it detects the signature part of the e-mail creator and discriminates that there is “personal information”. The reason is that the above-described character string inspection device cannot discriminate between the inspection target part and the non-inspection part (for example, the signature part of the mail creator) of the electronic mail.

  An object of the present invention is to provide an electronic mail apparatus, an electronic mail system, an electronic mail inspection method, and an electronic mail inspection program that solve the above-described problems.

  The electronic mail apparatus according to the present invention includes an inspection target determination unit that determines an inspection target part and a non-inspection part when inspecting whether or not the confidential information is included in the electronic mail, and secret information in the inspection target part. And a secret information inspecting unit for inspecting whether or not is included.

  The electronic mail system of the present invention includes a first electronic mail device that transmits an electronic mail and a second electronic mail device that receives the electronic mail, and the first electronic mail device includes secret information in the electronic mail. A test object discriminating unit for discriminating between a test target part and a non-test target part, and a secret information test unit for testing whether the test target part contains secret information With.

  In the e-mail inspection method of the present invention, when inspecting whether or not confidential information is included in an e-mail, the inspection target part and the non-inspection part are discriminated, and whether the inspection target part includes secret information Check for no.

  The program of the present invention is a means for discriminating between a part to be inspected and a part not to be inspected when checking whether or not secret information is included in an e-mail. It functions as a means for inspecting whether or not.

  The present invention has an effect that when inspecting whether or not confidential information is included in an e-mail, it is possible to discriminate between the inspection target part and the non-inspection part of the e-mail.

  Next, a first embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a diagram showing the configuration of the first embodiment, and is an explanatory diagram of the outline of the present invention. FIG. 1A is a diagram showing a configuration of the electronic mail apparatus 110.

  The electronic mail apparatus 110 is an information processing apparatus including a CPU (Central Processing Unit) that operates under program control, and implements the following functions according to programs stored in a program storage medium.

  The electronic mail apparatus 110 includes an inspection object determination unit 051 and a secret information inspection unit 610.

  The inspection object determination unit 051 determines an inspection object part and an inspection object non-inspection part when inspecting whether or not confidential information is included in the e-mail.

  The secret information inspection unit 610 inspects whether or not secret information is included in the inspection target part.

  FIG. 1B is a diagram showing the configuration of the electronic mail system 001.

  The e-mail system 001 includes an e-mail device 110a, an e-mail device 110b, and a network 100.

  The electronic mail device 110a includes the same function as the electronic mail device 110 described above, and transmits an electronic mail to the electronic mail device 110b. The electronic mail device 110a can be called a first electronic mail device. The electronic mail apparatus 110b receives an electronic mail from the electronic mail apparatus 110a. The e-mail device 110b can be referred to as a second e-mail device.

  Next, effects of the first exemplary embodiment of the present invention will be described.

  The first embodiment of the present invention has an effect that when checking whether or not confidential information is included in an e-mail, it is possible to discriminate between the inspection target part and the non-inspection part of the e-mail. Play. The reason is that when the e-mail device 110 or the e-mail device 110a inspects whether or not the confidential information is included in the e-mail, the e-mail device 110 or the e-mail device 110a includes It is for including.

  Next, a second embodiment of the present invention will be described in detail with reference to the drawings.

  The configuration of the second embodiment of the present invention will be described.

  FIG. 2 is a diagram showing a configuration of the electronic mail system 001.

  The electronic mail system 001 includes a terminal device 010, a mail server 011, a mail filtering server 012, and a mail encryption server 013. The terminal device 010, the mail server 011, the mail filtering server 012 and the mail encryption server 013 are information processing apparatuses including a CPU (Central Processing Unit) that operates under program control. These information processing apparatuses realize respective functions in accordance with programs stored in the program storage medium.

  The terminal device 010 is an information processing device such as a personal computer (Personal Computer), and transmits and receives electronic mail. The terminal device 010 can be called an electronic mail device. The terminal device 010 on the transmission side can be called a first electronic mail device, and the terminal device 010 on the reception side can be called a second electronic mail device.

  The mail server 011 is a server that transmits mail of the terminal device 010 in conformity with, for example, the SMTP (Simple Mail Transfer Protocol) protocol.

  The mail filtering server 012 is a server that detects when the header of an electronic mail transmitted by the terminal device 010 includes an automatic encryption flag.

  The mail encryption server 013 is a server that encrypts the electronic mail when the automatic encryption flag is detected in the mail filtering server 012.

  The network 100 is a network such as an in-house LAN (Local Area Network) or the Internet.

  FIG. 3 is a diagram illustrating a configuration of the terminal device 010.

  The terminal device 010 executes a mail program by the CPU and realizes the following functions. The terminal device 010 includes a mailer 111 (MUA: Mail User Agent).

  The mailer 111 includes a mail creating unit 021 that is a general mail function for sending and receiving mails, a mail sending unit 023, and a mail encryption unit 022 that performs encryption.

  Further, the mailer 111 includes a mail inspection unit 031 and a transmission control selection unit 032 that are plugged in as an electronic mail inspection program.

  The mail inspection unit 031 includes a mail input unit 041, an inspection object determination unit 051, a personal information inspection unit 061, and a transmission control unit 071.

  The mail input unit 041 inputs the email created by the mail creation unit 021. Here, the e-mail is e-mail data including a header and a body (text) described later in FIG.

  The inspection target determination unit 051 determines an inspection target part and a non-inspection part when inspecting whether or not personal information is included in the input electronic mail.

  The personal information inspection unit 061 inspects whether or not personal information is included in the inspection target portion of the e-mail.

  The transmission control unit 071 and the transmission control selection unit 032 confirm the transmission method to the user when personal information is detected by e-mail (selection of “suspend”, “encryption”, “add flag”, “replace”) I do. Depending on the selection result, the transmission control unit 071 executes the selected process.

  FIG. 4 is a diagram illustrating the configuration of the mail input unit 041.

  The mail input unit 041 includes a mail data input unit 042, a reply determination unit 043, and a stored mail management DB 044 (Data Base).

  The mail data input unit 042 inputs an e-mail from the mail creation unit 021.

  The reply determination unit 043 determines whether the created electronic mail is a reply mail. If the created electronic mail is a reply mail, the reply determination unit 043 adds a reply flag to the field of the electronic mail in the stored mail management DB 044 described later. Further, the reply determination unit 043 inputs the original electronic mail that is the source of the reply mail from the stored mail management DB 044 and outputs it to the inspection target determination unit 051 together with the electronic mail to be transmitted.

  The stored mail management DB 044 stores e-mails received by the mailer 111 in the past. The stored mail management DB 044 stores the e-mail every time the mailer 111 receives the e-mail. The stored mail management DB 044 can search for e-mails received by the mailer 111 in the past using, for example, an identifier “Message-Id” that can uniquely identify the e-mail.

  FIG. 5 is a diagram illustrating a configuration of the inspection object determination unit 051.

  The inspection target determination unit 051 includes a reply flag determination unit 052, a quoted part determination unit 053, a signature determination unit 054, an inspection target part determination unit 055, and a signature profile 056.

  The reply flag determination unit 052 determines whether or not the reply flag is in the column of the electronic mail in the stored mail management DB 044.

  The quoted part determination unit 053 searches for the character string (quoted part) of the original electronic mail in the body of the electronic mail (reply mail). Then, an inspection target part determination unit 055 described later determines a part excluding the cited part as an inspection target part.

  The signature discriminating unit 054 searches the text of the e-mail for the character string of the e-mail creator's signature. Then, a later-described inspection target part determination unit 055 determines a part excluding the signature part as an inspection target part.

  The inspection target part determining unit 055 determines the part excluding the quoted part and the signature part in the body of the electronic mail as the inspection target part.

  The signature profile 056 stores the signature of the e-mail creator (the user who is logged in to the terminal device 010) shown in FIG. 9 from a signature storage unit (not shown) of the mailer 111 and stores it.

  FIG. 6 is a diagram illustrating a configuration of the personal information inspection unit 061.

  The personal information inspection unit 061 includes an inspection target partial input unit 062, a personal information search unit 063, and a personal information profile 064.

  The inspection target part input unit 062 inputs an inspection target part of the e-mail.

  The personal information search unit 063 performs personal information search of the inspection target part. For example, the personal information search unit 063 performs a search using character strings such as names and addresses stored in the personal information profile 064 as keys. When personal information is included in the inspection target part, the personal information search unit 063 outputs an e-mail and personal information data (position, corresponding character string, etc.) to the transmission control unit 071. When personal information is not included in the inspection target part, the personal information search unit 063 outputs an e-mail to the mail transmission unit 023.

  The personal information profile 064 stores character strings such as names and addresses.

  FIG. 7 is a diagram illustrating a configuration of the transmission control unit 071 and the transmission control selection unit 032.

  The transmission control unit 071 inputs the transmission method selected by the user from the transmission control selection unit 032 (“interruption”, “encryption”, “flag addition”, “replacement”) and executes processing. In the case of “encryption”, an e-mail is output to the mail encryption unit 022, and the e-mail encryption unit 022 encrypts the e-mail.

  The transmission control selection unit 032 displays a transmission method confirmation screen according to an instruction from the transmission control unit 071, and selects a transmission method by an operation performed by a user (for example, an e-mail creator) on the transmission method confirmation screen.

  FIG. 8 is a diagram showing the configuration of the e-mail. As shown in FIG. 8A, the e-mail includes a header and a body (text).

  FIGS. 8B and 8C are diagrams showing examples of the header and body (text) of the original e-mail. The stored mail management DB 044 stores the e-mail whenever the mailer 111 receives an e-mail including such a header and body. Here, the meaning of “original” in the original electronic mail means an original electronic mail corresponding to a reply mail described later with reference to FIGS. In the header of the original electronic mail in FIG. 8B, the item indicated by “Message-Id: <ΔΔΔΔ>” is an identifier item that can uniquely identify the original electronic mail.

  FIGS. 8D and 8E are diagrams showing an example of a header and body (text) of a reply mail for the original electronic mail. In the reply mail header for the original electronic mail in FIG. 8D, the item indicated by “References: <ΔΔΔΔ>” indicates that this electronic mail is a reply mail because of the presence of this item. It is an item. In addition, “<ΔΔΔΔ>” is “Message-Id” of the original electronic mail of this reply mail. Therefore, the reply determination unit 043 can obtain “Message-Id” of the original e-mail by examining the item “References” in the header of the reply e-mail, and search the stored e-mail management DB 044 for the original e-mail. it can.

  FIG. 9 is a diagram showing the signature of the e-mail creator. A signature profile 056 stores the signature of the e-mail creator.

  Above, description of the structure of the 2nd Embodiment of this invention is complete | finished.

  Next, the operation of the second exemplary embodiment of the present invention will be described.

  FIG. 10 is a flowchart showing the operation of the mail input unit 041.

  The mail data input unit 042 inputs an e-mail from the mail creation unit 021 (A1).

  Next, the reply determination unit 043 determines whether the created electronic mail is a reply mail (A2). For example, as shown in FIG. 8D, the reply determination unit 043 can determine whether the created electronic mail is a reply mail depending on whether or not there is an item “References” in the mail header of the electronic mail. .

  Next, when the created electronic mail is a reply mail (A2, Yes), the reply determination unit 043 adds a reply flag to the item of the electronic mail in the stored mail management DB 044 (A3).

  Next, the reply determination unit 043 inputs the original e-mail that is the source of the reply mail from the stored mail management DB 044 (A4). For example, the reply determination unit 043, as shown in FIG. 8D, the “Message-Id” of the original email stored in the “Reference” item of the header of the reply mail “<” in the case of FIG. 8D “< △△△△ ＞ ”)”. Then, the reply determination unit 043 searches the stored mail management DB 044 using “Message-Id” of the original e-mail that is the source of this reply mail as a key, thereby inputting the original e-mail from the stored mail management DB 044. Can do. When a reply is made to a received e-mail, a reply is made to the e-mail, and a reply is made to the e-mail, that is, a reply e-mail is sent multiple times The reply determination unit 043 inputs the latest original e-mail.

  Next, when the created electronic mail is not a reply mail (A2, No), or when the process of step A3 is terminated, the operation of the present embodiment proceeds to the process of step B1. The reply determination unit 043 outputs the electronic mail and the original electronic mail (in the case of a reply mail) to the inspection target determination unit 051.

  FIG. 11 is a flowchart showing the operation of the inspection object determination unit 051.

  The reply flag determination unit 052 determines whether or not there is a reply flag in the item of the electronic mail in the stored mail management DB 044 (B1).

  When there is a reply flag in the item of the e-mail in the stored mail management DB 044 (B1, Yes), the quoted part determining unit 053 determines the cited part in the body of the email (B2). When there is no reply flag in the item of the e-mail in the stored mail management DB 044 (B1, No), the operation of the inspection object determination unit 051 skips the process of step B2 and proceeds to the process of step B3.

  FIG. 12 is a flowchart for explaining details of Step B2.

  The quoted part determination unit 053 inputs the e-mail and the original e-mail that is the source of the e-mail (reply mail) (B21). That is, the quoted part determination unit 053 sends the e-mail shown in FIGS. 8D and 8E and the original e-mail shown in FIGS. 8B and 8C from the reply determination unit 043 of the mail input unit 041. input.

  Next, the quoted part determination unit 053 searches for the character string in the body of the original electronic mail in the body of the electronic mail (reply mail) (B22). When the quoted part determining unit 053 finds the character string of the original e-mail in the body of the e-mail (reply mail) (B23, Yes), the cited part determining unit 053 determines the range (line) of the quoted part. (B24). That is, the quoted part determination unit 053 determines the range (line) of the original electronic mail character string in the body of the reply mail.

  When the quoted part determination unit 053 does not find the character string of the original e-mail in the body of the e-mail (reply mail) (B23, No), the process of step B24 is skipped. Above, the process of step B2 is complete | finished.

  In the present embodiment, the quoted part determining unit 053 performs the character string of the body (text) of the original email shown in FIG. 8 (c) in the body (text) of the email shown in FIG. 8 (e). Search for. Then, the quoted part determination unit 053 finds the character string of the body (text) of the original e-mail and determines the range (line) of the quoted part.

  Next, the signature discriminating unit 054 discriminates the signature part in the body of the e-mail (B3).

  FIG. 13 is a flowchart illustrating the details of step B3.

  The signature determination unit 054 inputs the e-mail and the e-mail creator's signature (B31). That is, the signature determination unit 054 inputs the e-mail shown in FIGS. 8D and 8E from the mail input unit 041. The signature determination unit 054 inputs the signature of the e-mail creator shown in FIG. 9 from the signature profile 056.

  Next, the signature discriminating unit 054 searches the text of the e-mail for the character string of the e-mail creator's signature (B32). When the signature determination unit 054 finds the character string of the email creator's signature in the body of the email (B33, Yes), the signature determination unit 054 determines the range (row) of the signature part (B34). ). That is, the signature determination unit 054 determines the range (line) of the character string of the signature of the email creator in the body of the email.

  If the signature determination unit 054 does not find the character string of the signature of the email creator in the body of the email (B33, No), the process of step B34 is skipped. Above, the process of step B3 is complete | finished.

  In the present embodiment, the signature discriminating unit 054 searches for the character string of the signature of the email creator shown in FIG. 9 in the body (text) of the email shown in FIG. Then, the signature determination unit 054 finds the character string of the signature of the e-mail creator and determines the range (row) of the character string of the signature of the e-mail creator.

Next, the inspection target part determination unit 055 determines the inspection target part in the body of the email (B4). That is, when the range (row) of the quoted part is determined in the process of step B2,
The inspection target part determination unit 055 determines the range (line) of the character string of the original e-mail as the non-inspection part. When the range (row) of the character string of the signature of the e-mail creator is determined in the process of step B3, the inspection target part determination unit 055 determines the range (line) of the character string of the signature of the e-mail creator. Is determined as a part not subject to inspection. Then, the inspection target part determination unit 055 determines a part excluding the non-inspection part as an inspection target part.

  In Steps B2 and B3, if the original e-mail character string and the e-mail creator's signature character string are not found in the e-mail body, the inspection target part determination unit 055 determines that all of the e-mail body This part is determined as the inspection target part. In the present embodiment, the character string of the original electronic mail and the character string of the signature of the electronic mail creator are found in the electronic mail text. Therefore, the inspection target part determination unit 055 determines the part other than the signature of the email creator and the original electronic mail part as the inspection target part in the body (text) of the electronic mail shown in FIG. .

  The inspection object determination unit 051 outputs the e-mail and the data of the inspection object part to the personal information inspection unit 061.

  FIG. 14 is a flowchart showing the operation of the personal information inspection unit 061.

  The inspection target part input unit 062 inputs the inspection target part of the e-mail (C1).

  Next, the personal information search unit 063 performs personal information search of the inspection target part (C2). For example, the personal information search unit 063 performs a search using a character string such as a person name and address stored in the personal information profile 064 as a key, and checks whether the personal information is included in the inspection target portion of the e-mail. Also, the personal information search unit 063 inspects, for example, whether or not the same number as the number of digits of the telephone number or credit card card number is continuous.

  Next, when personal information is included in the inspection target part (C3, Yes), the personal information inspection unit 061 transmits the electronic mail and the detected personal information data (position, corresponding character string, etc.) to the transmission control unit. 071, and the operation of the present embodiment proceeds to the processing of step D1 described later.

  When personal information is not included in the portion to be inspected (C3, No), the personal information inspection unit 061 outputs an e-mail to the mail transmission unit 023, and the operation of the present embodiment is the processing of step D7 described later. Migrate to

  FIG. 15 is a flowchart showing operations of the transmission control unit 071 and the transmission control selection unit 032.

  The transmission control selection unit 032 displays a transmission method confirmation screen (D1). For example, the transmission control selection unit 032 displays a transmission method confirmation screen on the display of the terminal device 010 or the like. The transmission method confirmation screen displays an e-mail text in which the detected personal information portion is shaded, and transmission method options (“suspend”, “encryption”, “flag”, “replacement”).

  Next, the transmission control selection unit 032 selects a transmission method by an operation of a user (eg, an e-mail creator) (D2). For example, when the e-mail creator clicks a transmission method option on the transmission method confirmation screen with a mouse or the like, the transmission control selection unit 032 selects the option and outputs the selection result to the transmission control unit 071.

  Next, when the selected transmission method is “interruption” (D3, Yes), the transmission control unit 071 drafts and stores the e-mail (D8), and the process ends.

  When the selected transmission method is not “interrupt” (D3, No), and when the selected transmission method is “encryption” (D4, Yes), the mail encryption unit 022 displays the entire electronic mail (electronic The mail body and attached file are encrypted (D9). The mail encryption unit 022 encrypts an electronic mail using S / MINE (Secure Multipurpose Internet Mail Extensions) or OpenPGP (Pretty Good Privacy).

  When the selected transmission method is not “encryption” (D4, No) and the selected transmission method is “flag addition” (D5, Yes), the transmission control unit 071 automatically encrypts the e-mail. A new mail header including the conversion flag is added (D10).

  When the selected transmission method is not “flag addition” (D5, No), and when the selected transmission method is “replacement” (D6, Yes), the transmission control unit 071 converts the character string of the personal information. Replace with another character string (D11). For example, the transmission control unit 071 replaces a character string of personal information with a character string such as “*”.

  When personal information is not included in the inspection target part (C3, No), when the selected transmission method is not “replacement” (D6, No), or the transmission control unit 071 encrypts the email If it does (D9), the mail transmission unit 023 transmits an electronic mail (D7). Also, when the transmission control unit 071 adds a flag to the header part of the e-mail (D10), or when the transmission control unit 071 replaces the character string of the personal information with another character string (D11), the e-mail is transmitted. The unit 023 transmits an electronic mail (D7).

  When the transmission control unit 071 adds a new mail header including an automatic encryption flag to the header part of the email (D10), the mail filtering server 012 detects the automatic encryption flag of the transmitted email. Then, the mail encryption server 013 deletes the mail header, and then encrypts the entire electronic mail (including the electronic mail text and attached file). Thus, the encryption may be executed by the mail encryption unit 022 of the terminal device 010, or may be executed by the mail filtering server 012 and the mail encryption server 013. When the mail filtering server 012 and the mail encryption server 013 perform encryption, the key management can be unified.

  Above, description of operation | movement of the 2nd Embodiment of this invention is complete | finished.

  Next, a modification of the second embodiment of the present invention will be described.

  In the above description, the quoted part discrimination (B2) is performed by the quoted part discriminating unit 053 searching for the character string of the original electronic mail in the body of the reply mail (email) (B22). Instead, if there is a “>” symbol or the like in the first column of the original e-mail character string in the body of the reply e-mail, the quoted part determination unit 053 uses the “>” symbol to The range (line) of the character string of the mail may be determined.

  Next, effects of the second exemplary embodiment of the present invention will be described.

  The second embodiment of the present invention has the effect that when inspecting whether or not confidential information is included in an e-mail, it is possible to discriminate between the inspection target part and the non-inspection part of the e-mail. Play. The reason is that an inspection object discriminating unit 051 for discriminating between the inspection object part and the non-inspection part is provided.

  When a user sends an e-mail, the user wants the user to detect the personal information in advance and prevent leakage by performing a personal information inspection of the entire e-mail (including attached files) including the e-mail body. Exists. However, if the mailer inspects the entire e-mail as it is, the mailer recognizes the signature part as personal information and recognizes all mails with the signature part as "personal information exists" was there. For this reason, it is necessary for the user to check the mail again. As a result, the mailer cannot automatically perform the personal information inspection. As a workaround, there is a method of “only the attached file is inspected”, but with this method, the e-mail text cannot be inspected. The second embodiment of the present invention can automatically perform personal information inspection on an electronic mail including a mail text.

It is a figure which shows the structure of 1st Embodiment, and is an outline explanatory drawing of this invention. 1 is a diagram illustrating a configuration of an electronic mail system 001. FIG. It is a figure which shows the structure of the terminal device 010. It is a figure which shows the structure of the mail input part 041. FIG. It is a figure which shows the structure of the test object discrimination | determination part 051. FIG. It is a figure which shows the structure of the personal information test | inspection part 061. FIG. It is a figure which shows the structure of the transmission control part 071 and the transmission control selection part 032. It is a figure which shows the structure of an email. It is a figure which shows a signature of an e-mail creator. It is a flowchart which shows operation | movement of the mail input part 041. It is a flowchart which shows operation | movement of the test object discrimination | determination part 051. It is a flowchart explaining the detail of step B2. It is a flowchart explaining the detail of step B3. It is a flowchart which shows operation | movement of the personal information test | inspection part 061. 10 is a flowchart showing operations of a transmission control unit 071 and a transmission control selection unit 032.

Explanation of symbols

010 Terminal device 011 Mail server 012 Mail filtering server 013 Mail encryption server 021 Mail creation part 022 Mail encryption part 023 Mail transmission part 031 Mail inspection part 032 Transmission control selection part 041 Mail input part 042 Mail data input part 043 Reply determination part 044 Stored mail management DB
051 Inspection object determination unit 052 Reply flag determination unit 053 Cited part determination unit 054 Signature determination unit 055 Inspection object part determination unit 056 Signature profile 061 Personal information inspection unit 062 Inspection object part input unit 063 Personal information search unit 064 Personal information profile 071 Transmission Control unit 100 Network 110, 110a, 110b E-mail device 111 Mailer 610 Secret information inspection unit

Claims (12)

When inspecting whether or not confidential information is included in the e-mail, an inspection object determination unit that determines an inspection object part and an uninspection part;
An electronic mail apparatus comprising: a secret information inspection unit that inspects whether or not secret information is included in the inspection target part. The inspection object determination unit,
The electronic mail apparatus according to claim 1, further comprising: a signature determination unit that determines a signature part in the body of the electronic mail as a part not to be inspected. A signature profile for storing the signature of the email creator;
The signature discrimination unit
The electronic mail apparatus according to claim 2, wherein a character string of the electronic mail creator's signature stored in the signature profile is searched in a body of the electronic mail. When the e-mail is a reply mail, the inspection object determination unit
The electronic mail apparatus according to any one of claims 1 to 3, further comprising: a citation portion determination unit that determines a citation portion in the body of the electronic mail as a non-inspection portion. Stored mail management DB for storing e-mails received by e-mail devices in the past
Including
The cited part determination unit
The electronic mail device according to claim 4, wherein a character string of the original electronic mail returned by the electronic mail stored in the stored mail management DB is searched in a text of the electronic mail. A first e-mail device for sending e-mail;
A second e-mail device for receiving e-mail;
An electronic mail system, wherein the first electronic mail apparatus is the electronic mail apparatus according to any one of claims 1 to 5. When inspecting whether or not confidential information is included in the e-mail, the part to be inspected and the part not to be inspected are determined,
An e-mail inspection method for inspecting whether or not confidential information is included in the inspection target part. The e-mail inspection method according to claim 7, wherein a signature part in the body of the e-mail is determined as a non-inspection part. The e-mail inspection method according to claim 8, wherein a character string of the e-mail creator's signature is searched in a body of the e-mail. The e-mail inspection method according to claim 7, wherein when the e-mail is a reply e-mail, a quoted portion in the body of the e-mail is determined as a non-inspection portion. The e-mail inspection method according to claim 10, wherein a character string of the original e-mail returned by the e-mail is searched in a body of the e-mail. On the computer,
When inspecting whether or not confidential information is included in an e-mail, means for discriminating between a part to be inspected and a part not to be inspected. Program for.

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