JP3715621B2 - E-mail determination apparatus, e-mail determination program, and recording medium storing the program - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an e-mail determination apparatus capable of preventing transmission of an e-mail including an inappropriate mail header, an e-mail determination program, and a recording medium storing the program.
[0002]
[Prior art]
The mail magazine distribution server, when a mail magazine manuscript is sent in the form of a Japanese e-mail from the mail magazine creator, attaches a mail header suitable for Japanese to the mail magazine and returns it as an e-mail. When the e-mail magazine creator confirms that the e-mail is correctly displayed, the e-mail magazine creator grants the e-mail magazine distribution server permission to send. With this transmission permission, the mail magazine distribution server distributes the e-mail to the reader as a mail magazine.
[0003]
The following patent documents disclose techniques similar to the above.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 11-184778
[Problems to be solved by the invention]
However, an e-mail having an inappropriate mail header may be transmitted to the mail magazine creator due to a problem in the mail magazine distribution server. In addition, since the mail magazine distribution server does not have a function for correcting illegal characters such as half-width kana characters, an electronic mail containing the illegal characters may be transmitted.
[0006]
Originally, by displaying mail software used by the mail magazine creator, such illegal characters and inappropriate mail headers are discovered, but depending on the mail software, illegal characters such as half-width kana characters and inappropriate mail Since the header is corrected and displayed, in that case, the mail magazine creator permits transmission. Then, depending on the e-mail software used by e-mail magazine readers, it will be displayed inappropriately. Accordingly, the present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide an e-mail determination device that can prevent transmission of an e-mail including an inappropriate e-mail header. is there.
[0007]
It is also an object of the present invention to provide an e-mail determination device that can prevent transmission of both e-mails including illegal characters and e-mails including inappropriate mail headers.
[0008]
[Means for Solving the Problems]
In order to solve the above-described conventional problems, the present invention of claim 1 is directed to the subject of the e-mail when the e-mail generated and stored in the e-mail generation / transmission apparatus that generates and transmits the e-mail arrives. A first e-mail determination unit that determines whether or not a subject line indicating an attribute includes a character string indicating a rule corresponding to a predetermined 2-byte language; and an attribute of the text of the incoming e-mail It is determined whether or not the text attribute line includes a character string indicating the character set corresponding to the 2-byte language, and the text encoding attribute line indicating the encoding attribute of the text of the email is a unit for the encoding. Second e-mail determining means for determining whether or not a character string indicating the number of bits is included; and the first e-mail determining means or the second e-mail determining means E-mail transmission for performing communication for permitting transmission of the e-mail stored in the e-mail generation / transmission apparatus to the e-mail generation / transmission apparatus when a negative determination is not made by the e-mail determination means An e-mail determination device characterized by having permission means is used as the solution means.
[0009]
Further, according to the present invention of claim 2, when the character information that has arrived as the manuscript of the e-mail includes illegal characters that are ineligible for the e-mail, the character information does not include the illegal characters and the predetermined two bytes. A subject manuscript judging means for judging whether the character information includes a character in the language or the character information does not contain the illegal character or the character in the two-byte language, and the manuscript in the body of the e-mail When the incoming character information includes the illegal character, the incoming character information does not include the illegal character, and includes the 2-byte language character, and the incoming character information includes the illegal character and the 2-byte language It is determined that the body manuscript judging means for determining which of the cases where no character is included, and the case where the subject manuscript judging means contains a 2-byte language character. An e-mail is generated and stored in an e-mail generation / transmission device that generates and transmits an e-mail based on the character information that is the determination target at that time and the character information that is the determination target of the text document determination unit. First email determination means for determining whether or not a character string indicating a rule corresponding to the 2-byte language is included in a subject line indicating a subject attribute of the email when the email arrives; The electronic mail generation / transmission apparatus based on the character information that is the determination target of the subject document determination unit and the character information that is the determination target when the text document determination unit includes a character including a 2-byte language character When the e-mail is generated and stored and the e-mail arrives, the body attribute line indicating the attribute of the body of the e-mail corresponds to the 2-byte language. It is determined whether or not a character string indicating the character set is included, and whether or not a character string indicating the number of unit bits at the time of encoding is included in the body encoding attribute line indicating the encoding attribute of the body of the email A second e-mail determination unit that determines whether or not the first e-mail determination unit or the second e-mail determination unit makes a negative determination to the e-mail generation and transmission device An e-mail determination device comprising: an e-mail transmission permission unit that performs communication for permitting transmission of the e-mail stored in the e-mail generation / transmission device.
[0010]
Further, the present invention of claim 3 is characterized in that the e-mail transmission permission means performs the communication for permitting the transmission of the e-mail by e-mail. To do.
[0011]
According to a fourth aspect of the present invention, there is provided an e-mail determination program for causing a computer to function each unit of the e-mail determination apparatus according to any one of the first to third aspects.
[0012]
According to a fifth aspect of the present invention, there is provided a recording medium storing an e-mail determination program that causes a computer to function each unit of the e-mail determination apparatus according to any one of the first to third aspects.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that “illegal characters” refers to characters that are ineligible for the subject (title) or body of an e-mail. Hereinafter, a half-width kana character is taken as an example. “Double-byte language” refers to a language such as a country that uses a number of characters that cannot be represented by only one-byte character (one-byte character). For example, Japanese, Korean, Chinese and Thai. The following is an example of Japanese. The “2-byte character” is a character represented by 2 bytes. Hereinafter, a 2-byte character such as a Japanese kanji in a 2-byte language is taken as an example. In addition, a mail magazine distributed as an e-mail is an example of e-mail.
[0014]
FIG. 1 is a diagram showing the configuration of a network including a check server 1 to which the present invention is applied.
[0015]
The check server 1 corresponding to the electronic mail determination apparatus of the present invention and the mail magazine distribution server 2 corresponding to the electronic mail generation / transmission apparatus of the present invention are connected via a communication line. The check server 1 is connected to a computer system (referred to as a mail magazine creator device) 3 used by a mail magazine creator via a communication line. The mail magazine distribution server 2 is connected via a communication line to a computer system (called a mail magazine reader device) 4 used for each mail magazine reader.
[0016]
FIG. 2 is a diagram illustrating a configuration of the check server 1.
[0017]
The check server 1 includes a database DB1 that stores 1-byte characters other than single-byte kana characters, a database DB2 that stores 2-byte Japanese characters, and characters that have arrived from the mail magazine creator device 3 as a manuscript for a mail magazine subject. When the information contains half-width kana characters, when the character information does not contain half-width kana characters and contains Japanese 2-byte characters, and when the character information does not contain half-width kana characters and Japanese double-byte characters Subject manuscript determination means 11 for determining whether the character information has arrived, and when the character information that has arrived as the manuscript of the main body of the e-mail magazine includes a half-width kana character, The case where Japanese double-byte characters are included and the incoming character information does not include half-width kana characters and Japanese double-byte characters. The text document determination means 12 for determining which of the cases, and the character information and the text document that were the object of determination when the subject document determination means 11 determines that it contains Japanese 2-byte characters When the mail magazine is generated and stored in the mail magazine distribution server 2 based on the character information that is the determination target of the determination means 12, and the mail magazine arrives, the subject line indicating the subject attribute of the mail magazine is displayed in Japan. The first e-mail determination unit 13 that determines whether or not a character string indicating a rule corresponding to a word is included, and the character information and the text document determination unit 12 that are subject to determination by the subject document determination unit 11 are two. The mail magazine distribution server 2 uses the mail information based on the character information that is the object of determination when it is determined that it contains a byte language character. Is generated and stored and the mail magazine arrives, it is determined whether or not the text attribute line indicating the text attribute of the mail magazine contains a character string indicating a character set corresponding to Japanese. A second e-mail determining means for determining whether or not a character string indicating the number of unit bits at the time of encoding is included in the body encoding attribute line indicating the encoding attribute of the body of the mail magazine; To permit the mail magazine distribution server 2 to transmit the mail magazine stored in the mail magazine distribution server 2 when the mail determination unit 13 or the second e-mail determination unit 14 does not make a negative determination. This is a computer system provided with e-mail transmission permission means 15 for transmitting the e-mail.
[0018]
Next, the operation of each server and computer system in FIG. 1 will be described.
[0019]
FIG. 3 is a diagram for explaining the flow of determination processing for a mail magazine document performed by the check server 1. The mail magazine creator device 3 generates character information d1 composed of one or more characters as a mail magazine subject manuscript by the operation of the mail magazine creator, and the character magazine composed of one or more characters as a mail magazine text manuscript. Information d2 is generated, and these character information d1 and d2 are transmitted to the check server 1 (step S1).
[0020]
When the check server 1 receives the character information d1 and d2 that has arrived from the mail magazine creator device 3, the subject manuscript determination means 11 displays each character of the character information d1, each character of the database DB1, and each character information d1. The character is compared with each character in the database DB2 (step S3).
[0021]
When the subject document determination unit 11 includes the character information d1 including a half-width kana character (case 1), the character information d1 does not include the half-width kana character, and includes a Japanese 2-byte character (case 2). It is determined whether the character information d1 does not include a half-width kana character or a Japanese 2-byte character (case 3) (step S5).
[0022]
In case 2, the subject document determination means 11 sets a flag indicating that it includes Japanese 2-byte characters in the character information d1 (step S7).
[0023]
When step S7 is completed or when it is determined as case 3 in step S5, the body document determination means 12 displays each character of the character information d2 and each character of the database DB1, and each character of the character information d2 and the database. Each character of DB2 is compared (step S9).
[0024]
Then, when the text document determination unit 12 includes the character information d2 including a half-width kana character (case 4), the character information d2 does not include the half-width kana character, and includes a Japanese 2-byte character (case 5). Whether the character information d2 does not include a half-width kana character or a Japanese 2-byte character (case 6) is determined (step S11).
[0025]
In case 5, the text document determination means 12 sets a flag in the character information d2 meaning that it includes Japanese 2-byte characters (step S13).
[0026]
In case 1 or case 4, the text document determination means 12 displays that the document contains illegal characters on the screen of the mail magazine creator apparatus 3 (step S15), and ends the process.
[0027]
When step S13 is completed or when it is determined as case 6 in step S11, the check server 1 transmits the character information d1 and d2 that have undergone such processing to the mail magazine distribution server 2 (step S17).
[0028]
FIG. 4 is a diagram for explaining the flow of the e-mail determination process performed by the check server 1. The mail magazine distribution server 2 creates a mail magazine based on the character information d1 and d2 that arrived in step S17, stores this mail magazine, transmits it to the check server 1, and allows transmission from the check server 1. (Step S21).
[0029]
At this time, the character string “=? Iso-2022-jp?” Indicating the rule corresponding to Japanese is included in the subject line (Subject line) indicating the attribute of the subject in the mail header of this mail magazine. In addition, a text string “charset = iso-2022-jp” indicating a character set corresponding to Japanese is included in the text attribute line (Content-Type line) indicating the attribute of the text in the mail header of the mail magazine. In addition, a text string “7 bit” indicating the number of unit bits at the time of encoding is included in the text encoding attribute line (Content-Transfer-Encoding line) indicating the encoding attribute of the mail magazine text.
[0030]
However, since these may not be included in the mail header of the mail magazine for some reason, the following processing is performed.
[0031]
When the check server 1 receives the mail magazine, the first e-mail determination unit 13 reads the mail magazine subject (step S23). Then, it is determined whether or not a flag having a meaning including Japanese is set in the subject (step S25). If YES is determined, it is determined whether or not the character string “=? Iso-2022-jp?” Is included in the subject line of the mail header (step S27).
[0032]
If NO is determined in step S25 or YES is determined in step S27, the second e-mail determination unit 14 reads the text of the mail magazine (step S29). Then, it is determined whether or not a flag having a meaning including Japanese is set in the text (step S31). If YES is determined here, the second e-mail determining unit 14 sets the character string “charset =” indicating the character set corresponding to Japanese in the body attribute line (Content-Type line) of the mail header of the mail magazine. It is determined whether or not “iso-2022-jp” is included (step S33). If it is determined as YES, whether or not the text encoding attribute line (Content-Transfer-Encoding line) of the mail header of the mail magazine includes the character string “7bit” indicating the number of unit bits at the time of the encoding is determined. Determination is made (step S35).
[0033]
When it is determined NO in step S27, 33 or 35, the check server 1 displays on the screen of the mail magazine creator device 3 that the mail header of the mail magazine is ineligible (step S37). Finish the process.
[0034]
If it is determined NO in step S31 or YES in step S35, the check server 1 permits transmission to the mail magazine distribution server 2 by e-mail (step S39).
[0035]
When the mail magazine distribution server 2 receives the e-mail transmission permission from the check server 1, the mail magazine distribution server 2 transmits the stored mail magazine to each mail magazine reader device 4 (step S41).
[0036]
Even if a national character and / or machine-dependent character that cannot be represented by only one byte character is stored as an illegal character in the database DB1 together with, for example, a single-byte kana character or the like, the same effect can be obtained. .
[0037]
The transmission permission in step S39 may be performed by a communication protocol other than e-mail.
[0038]
Further, if it is not necessary to determine illegal characters due to reasons such as the reliability of the mail magazine creator, the character check server 1 transfers the incoming character information d1 and d2 to the mail magazine distribution server 2 as they are. A modified example in which the subject original determination unit 11 and the text original determination unit 12 are excluded may be employed.
[0039]
If the mail magazine distribution server 2 is compatible with other languages such as Korean, Chinese (7 bit), and Chinese (8 bit), the character string “iso-2022-jp” in the above embodiment is used. Set "ISO-2022-KR", "GB2312", "HZ-GB-2312" instead of, and set "8bit" instead of the character string "7bit" for Chinese (8bit) do it.
[0040]
The computer program that causes the above-described check server 1 and each of its modifications to function is the e-mail determination program of the present invention, which is a semiconductor memory, magnetic disk, optical disk, magneto-optical disk, magnetic tape, or the like. It can be widely distributed by being stored in a computer-readable recording medium or transmitted through a communication network such as the Internet.
[0041]
【The invention's effect】
As described above, according to the first aspect of the present invention, it is determined whether or not a character string indicating a rule corresponding to a predetermined 2-byte language is included in a subject line indicating an attribute of an email subject. And determining whether or not a text string indicating a character set corresponding to the 2-byte language is included in a body attribute line indicating an attribute of the body of the electronic mail. Second e-mail determining means for determining whether or not a character string indicating the number of unit bits at the time of encoding is included in the main body encoding attribute line indicating the encoding attribute of the main body, and first e-mail determination Stored in the e-mail generation / transmission apparatus in the case where no negative determination is made by the means or the second e-mail determination means The so and an e-mail transmission permitting means for performing communication to allow transmission of e-mail, can be prevented transmission of containing inappropriate mail header email.
[0042]
Further, according to the present invention of claim 2, the character information that has arrived as the manuscript for the subject of the e-mail includes an illegal character that is ineligible for the e-mail, and the character information is predetermined without including the illegal character. A subject manuscript determination means for determining whether the character information includes a character in a 2-byte language or a case in which the character information does not include the illegal character or a character in the 2-byte language; and the body of the e-mail When the character information that has arrived as the original document includes the illegal character, the character information that has arrived does not include the illegal character, and includes the character of the 2-byte language, and the incoming character information includes the illegal character and the 2-byte character When the body document determining means for determining which of the cases where the language characters are not included, and the subject document determining means include characters of a 2-byte language When the e-mail is generated and stored in the e-mail generation / transmission apparatus based on the character information that is the determination target when the determination is made and the character information that is the determination target of the text document determination unit, the e-mail arrives A first e-mail determining unit for determining whether or not a character string indicating a rule corresponding to the 2-byte language is included in a subject line indicating a subject attribute of the e-mail; and the subject document determining unit An e-mail is generated by the e-mail generation / transmission device based on the character information that was the determination target and the character information that was the determination target when the body document determination means determined to include characters of a 2-byte language When the stored e-mail arrives, the character set corresponding to the 2-byte language is set in the body attribute line indicating the attribute of the body of the e-mail. And whether or not a character string indicating the number of unit bits at the time of encoding is included in the body encoding attribute line indicating the encoding attribute of the body of the e-mail. Second electronic mail determination means for determining and the electronic mail generation / transmission apparatus when the negative determination is not made by the first electronic mail determination means or the second electronic mail determination means. An e-mail transmission permission means for performing communication for permitting the transmission of the e-mail stored in the e-mail generation / transmission device, so that an e-mail including illegal characters and an e-mail including an inappropriate mail header Any transmission can be prevented.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a network including a check server 1 to which the present invention is applied.
FIG. 2 is a diagram showing a configuration of a check server 1;
FIG. 3 is a diagram for explaining a flow of determination processing for a mail magazine document performed by the check server 1;
FIG. 4 is a diagram illustrating a flow of e-mail determination processing performed by the check server 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Check server 2 Mail magazine delivery server 3 Mail magazine creator apparatus 4 Mail magazine reader apparatus 11 Subject manuscript judgment means 12 Body manuscript judgment means 13 First e-mail judgment means 14 Second e-mail judgment means 15 E-mail transmission permission DB1, DB2 database

Claims (5)

When the e-mail generated and stored by the e-mail generation / transmission apparatus that generates and transmits an e-mail arrives, a rule corresponding to a 2-byte language predetermined in the subject line indicating the subject attribute of the e-mail is shown. First e-mail determining means for determining whether or not a character string is included;
It is determined whether or not a text string indicating a character set corresponding to the 2-byte language is included in a text attribute line indicating an attribute of the text of the incoming email, and indicates an encoding attribute of the text of the email A second e-mail determination unit that determines whether or not the text encoding attribute line includes a character string indicating the number of unit bits at the time of encoding;
The e-mail stored in the e-mail generation / transmission apparatus with respect to the e-mail generation / transmission apparatus when a negative determination is not made by the first e-mail determination means or the second e-mail determination means And an e-mail transmission permission means for performing communication for permitting transmission of the e-mail. When the character information that has arrived as the manuscript of the e-mail includes illegal characters that are ineligible for the e-mail, and when the character information includes characters of a predetermined 2-byte language without including the illegal characters, and the character information A subject manuscript determination means for determining which of the illegal character and the character of the two-byte language is not included,
The case where the character information that has arrived as the manuscript of the e-mail includes the illegal character, the case where the incoming character information does not contain the illegal character, and the character in the 2-byte language, and the character information that has arrived A text manuscript judging means for judging whether it is an illegal character or a case where a character of a 2-byte language is not included;
An e-mail is generated and transmitted based on the character information that is a determination target when it is determined that the subject document determination unit includes a character in a 2-byte language and the character information that is the determination target of the body document determination unit. When the e-mail is generated and stored in the e-mail generation / transmission apparatus and the e-mail arrives, the subject line indicating the subject attribute of the e-mail includes a character string indicating the rule corresponding to the 2-byte language. First e-mail determining means for determining whether or not
The electronic mail generation / transmission apparatus based on the character information that is the determination target of the subject document determination unit and the character information that is the determination target when the text document determination unit includes a character including a 2-byte language character Whether or not a character string indicating a character set corresponding to the 2-byte language is included in the body attribute line indicating the attribute of the body of the e-mail when the e-mail is generated and stored in Second e-mail determination means for determining whether or not a character string indicating the number of unit bits in the encoding is included in the body encoding attribute line indicating the encoding attribute of the e-mail body ,
The e-mail stored in the e-mail generation / transmission apparatus with respect to the e-mail generation / transmission apparatus when a negative determination is not made by the first e-mail determination means or the second e-mail determination means And an e-mail transmission permission means for performing communication for permitting transmission of the e-mail. 3. The e-mail determination device according to claim 2, wherein the e-mail transmission permission unit performs the communication for permitting the e-mail transmission by e-mail. An e-mail determination program for causing a computer to function each means of the e-mail determination device according to claim 1. 4. A recording medium storing an e-mail determination program that causes a computer to function each means of the e-mail determination apparatus according to claim 1.

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