JP2011204278A - Message transmission address confirmation device, message transmission address confirmation method, message transmission address confirmation program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent errors in a message transmission address, while dipensing with a keyword to be registered, in advance, without having to load a load on a transmitting person.SOLUTION: An address-detecting unit 22 determines the consistency of an address detected from the text of a received electronic mail, with an address retrieved from a message accumulation unit 26 corresponding to the address to be transmitted of the electronic mail, and confirms the propriety of transmission to a supervisor terminal 3, when there is no consistency. A mail text check unit 23 classifies the electronic mail of which the address to be transmitted is matched with that of the received electronic mail, into a correct category, and unmatched one into an error category, as to the electronic mail stored in the message accumulation unit 26, calculates an error probability of each word belonging to the error category, by using an appearance frequency of the word in the correct category and an appearance frequency of the word in the error category, and inquires conformation on the propriety of transmission, to the supervisor terminal 3, when the error probability corresponding to the word included in the received electronic mail is a defined value or more.

Description

  The present invention relates to a technique for confirming whether or not there is an error in a transmission destination of a message transmitted and received electronically.

  Currently, systems that send and receive messages electronically, such as e-mail and instant messages, are indispensable communication tools in the business scene from the viewpoint of convenience and speed. It is a major source of security incidents due to mistakes. The occurrence status is classified as follows.

  1. Incorrect destination entry when sending e-mail to first contact.

  2. Mistakes in selecting a destination from the address book or misdesignation errors due to autocomplete.

  3. Mistakes due to careless all-replies.

  As these countermeasures, there is a method in which attention and confirmation by the sender are thoroughly performed, such as a product disclosed in Non-Patent Document 1. The existing products (i) warn the sender by hop-up when matching the pre-registered keyword conditions and ask for confirmation of the destination, (ii) at the time of confirmation `` subject '' `` attached file '' `` A mechanism that prompts the sender's attention by presenting information such as keyword search results, email address, encryption, trusted domain, and transmission history, as well as judging and warning the email. Was offered.

Internet, <http: www.ntts.co.jp/products/ccraftmail/>

  However, the above-described mechanism has a problem that since the sender himself checks the destination address, the check is not performed as he gets used to. Also, it is necessary to perform maintenance work continuously for keyword pre-registration.

  The present invention has been made in view of the above, and an object of the present invention is to prevent an error in the transmission destination of a message without placing a burden on the sender and eliminating the need for keyword pre-registration. There is to do.

  According to a first aspect of the present invention, there is provided a database for storing a destination address and destination of a message transmitted in the past in association with each other, and a memory for receiving a message addressed to a destination terminal transmitted from a sender terminal. And receiving means for storing in the body of the received message and storing the destination in the storage means, searching for the corresponding destination from the database using the destination address of the message and storing in the storage means, The destination detection means for determining the identity between the destination detected from the text and the destination retrieved from the database, and if the result of the determination is that there is no identity, whether or not the message can be transmitted to the supervisor terminal A confirmation processing means for sending a confirmation request, and when the supervisor terminal obtains transmission permission, the message is read from the storage means. A message destination confirmation apparatus characterized by having a transmission means for transmitting to the destination terminal out.

  In the present invention, when there is no identity between the destination detected from the body of the received message and the destination retrieved from the database corresponding to the destination address of the message, the supervisor terminal receives the message. By confirming whether or not transmission is possible, it is possible to prevent a transmission destination error without imposing a burden on the sender. In particular, by incorporating a confirmation mechanism by the supervisor, it becomes possible to detect errors that are difficult for the sender to notice. In addition, since the destinations are compared, it is not necessary to pre-register keywords.

  In the message transmission destination confirmation apparatus, the detection unit detects a title from the text of the message, and detects a word before a character string indicating the title as a destination.

  In the present invention, since the destination is generally described before the title in the text of the message, the destination is surely detected by detecting the word before the character string indicating the title. I can do it.

  Further, the present invention relates to a step of associating and storing a destination address and a destination of a message transmitted in the past by a database, and a message addressed to a destination terminal transmitted from the sender terminal by the receiving means. Are stored in the storage means, and the destination detection means detects the destination from the body of the received message and stores it in the storage means, and uses the destination address of the message to retrieve the corresponding destination from the database. If the result of the determination by the step of determining the identity between the destination detected from the text and the destination detected from the database and the confirmation processing means are not identical, A notification requesting confirmation of whether or not the message can be transmitted to the supervisor terminal; Ri, when the transmission permission from the supervisor terminal is obtained, a message destination confirmation method characterized by comprising the steps of: transmitting by reading the message from the storage means to the destination terminal.

  Further, the present invention relates to a process of storing a destination address and a destination of a message transmitted in the past in association with each other in a database, and receiving and storing a message addressed to the destination terminal transmitted from the sender terminal. Processing to be stored in the means, the destination is detected from the body of the received message and stored in the storage means, the corresponding destination is searched from the database using the destination address of the message, and stored in the storage means, A process for determining the identity of the destination detected from the text and the destination retrieved from the database, and if the result of the determination is that there is no identity, the supervisor terminal confirms whether the message can be transmitted. Processing for performing the requested notification, and when transmission permission is obtained from the supervisor terminal, the message is read from the storage means and the transmission tip A message destination confirmation program characterized by executing a process of transmitting, to the computer to.

  The second aspect of the present invention includes a database for storing messages transmitted in the past, a receiving unit for receiving a message addressed to a transmission destination terminal transmitted from a sender terminal, and storing the message in a storage unit, and the database For messages in the middle, those that match the received message and destination address are classified into the correct category, and those that do not match are classified into the wrong category, and the appearance frequency of words in the correct category and the appearance frequency of words in the incorrect category are used. A calculation means for calculating an error probability indicating the probability of belonging to the error category for each word and storing it in the storage means, and an error probability corresponding to the word included in the received message is read from the storage means and set in advance. Text check means for determining whether the error probability is greater than or equal to the specified value, and monitoring if the error probability is greater than or equal to the specified value. A confirmation processing means for making a request for confirmation of permission to send the message to the supervisor terminal, and when the supervisor terminal obtains the transmission permission, the message is read from the storage means and transmitted to the destination terminal. A message transmission destination confirmation apparatus comprising: a transmission unit;

  In the present invention, regarding messages stored in the database, messages that match the received message and destination address are classified as a correct category, and messages that do not match are classified as an incorrect category. Then, using the appearance frequency of the words in the correct category and the appearance frequency of the words in the incorrect category, an error probability indicating the probability of belonging to the incorrect category is calculated for each word, and the word included in the message received from this If the error probability is equal to or greater than a specified value, the supervisor terminal is requested to confirm whether or not the message can be transmitted. As a result, it is possible to prevent a transmission destination error without imposing a burden on the sender. In particular, by incorporating a confirmation mechanism by the supervisor, it becomes possible to detect errors that are difficult for the sender to notice. Further, since the messages in the database are classified into the correct category and the incorrect category and the error probability is obtained, keyword pre-registration is unnecessary.

  In the message transmission destination confirmation apparatus, the calculation unit classifies messages in the database whose received address and source address match, into a correct category and an incorrect category.

  In the present invention, by classifying the received message and the one whose source address matches, only the messages transmitted by the same sender in the past are classified as targets. Calculation accuracy can be increased.

  In the message transmission destination confirmation device, the body check unit obtains an average of the error probabilities having a large value for a certain number of the error probabilities read from the storage unit, and compares the average value with a specified value. Features.

  In the present invention, by comparing the average value obtained only from the error probability having a large value with the specified value, the supervisor can be surely confirmed about a message whose destination is suspicious.

  According to the present invention, a message stored in the past is stored in the database, and a message addressed to the destination terminal transmitted from the sender terminal is received and stored in the storage unit by the receiving unit. Steps and body check means classify the messages in the database that match the received message and the destination address into the correct category, and those that do not match into the incorrect category. Using the appearance frequency of the word in the category, the error probability indicating the probability of belonging to the error category for each word is calculated and stored in the storage means, and the error probability corresponding to the word included in the received message is stored from the storage means. A step of reading and reading a predetermined value set in advance, and determining whether the error probability is equal to or higher than a predetermined value; A step of notifying the supervisor terminal to confirm whether or not the message can be transmitted when the error probability is equal to or greater than a predetermined value by the confirmation processing means; and a transmission permission is obtained from the supervisor terminal by the transmission means. And a step of reading the message from the storage means and transmitting the message to the destination terminal.

  The present invention also includes a process of storing a previously transmitted message in a database, a process of receiving a message addressed to a destination terminal transmitted from a sender terminal, and storing the message in a storage unit, and the database For messages in the middle, those that match the received message and destination address are classified into the correct category, and those that do not match are classified into the wrong category, and the appearance frequency of words in the correct category and the appearance frequency of words in the incorrect category are used. Then, the error probability indicating the probability belonging to the error category for each word is calculated and stored in the storage means, the error probability corresponding to the word included in the received message is read from the storage means, and the preset specified value And determining whether or not the error probability is equal to or higher than a specified value, and if the error probability is equal to or higher than a specified value, Causing the computer to execute a process of performing a notification requesting confirmation of whether or not the sage can be transmitted, and a process of reading the message from the storage unit and transmitting the message to the transmission destination terminal when a transmission permission is obtained from the supervisor terminal. This is a message transmission destination confirmation program.

  According to the present invention, it is possible to prevent an error in a message transmission destination without imposing a burden on the sender and making it unnecessary to pre-register keywords. Therefore, it is possible to reduce the incidence of incidents due to erroneous message transmission and reduce incident response costs.

It is a block diagram which shows the structure of the whole system to which the message transmission destination confirmation apparatus in one Embodiment is applied. FIG. 6A is a table showing past messages stored in the message storage unit 26, and FIG. 6B similarly associates destination addresses stored in the message storage unit 26 with destinations. It is a table. It is an example of the electronic mail which the sender terminal transmitted. It is a flowchart which shows the flow of a destination detection process. It is a flowchart which shows the flow of the confirmation process by a supervisor. It is another example of the electronic mail which the sender terminal transmitted. It is an example of the message for prompting confirmation of transmission permission / inhibition. It is an example of the Web page displayed when accessing URL in the message of FIG. It is a flowchart which shows the flow of a check process of a mail text. FIG. 4A shows an example of an electronic mail classified into the correct category, and FIG. 5B shows an example of an electronic mail classified into the wrong category. FIG. 4A shows the calculation result of the error probability for each word in the mail body, and FIG. 4B shows the calculation result of the error probability for each word in the subject. It is a flowchart which shows the flow of the confirmation process by the sender himself / herself.

  As shown in the block diagram of FIG. 1, the message transmission destination confirmation device 2 in the present embodiment can communicate with each of the sender terminal 1, the supervisor terminal 3, and the transmission destination terminal 4. The message transmission destination confirmation device 2 includes a mail control unit 21, a destination detection unit 22, a mail body check unit 23, a confirmation processing unit 24, a policy control unit 25, a message storage unit 26, and a message generation unit 27. The message transmission destination confirmation device 2 is configured by a computer including a storage device such as a memory and a hard disk and an arithmetic processing device, and the processing of each unit is executed by a program. Each unit performs processing using information read from the storage device, and stores the processing result in the storage device. The outline of the processing of each part is as follows. Although the present embodiment deals with electronic mail, the present invention can be similarly applied to other electronically transmitted and received messages such as instant messages.

  The mail control unit 21 temporarily stores the e-mail transmitted from the sender terminal 1 in an unchecked folder. Further, the transmission folder is periodically searched, and the electronic mail in the transmission folder is transmitted to the transmission destination terminal 4. Other processing will be described later.

  The destination detection unit 22 detects the destination from the body of the received electronic mail, searches the message storage unit 26, extracts the destination corresponding to the destination address of the received electronic mail, and determines the identity of both. .

  The mail body check unit 23 classifies the past e-mails stored in the message storage unit 26 into those that match the received e-mail and the destination address as the correct category and those that do not match into the incorrect category. Using the appearance frequency of the words in the middle and the appearance frequency of the words in the wrong category, an error probability indicating the probability of belonging to the wrong category for each word is calculated and stored in the storage device. Then, an error probability corresponding to a word included in the received message is read from the storage device and a predetermined value set in advance is read to determine whether the error probability is equal to or higher than the predetermined value.

  As a result of the determination by the destination detection unit 22, the confirmation processing unit 24 determines whether the destination detected from the body of the email and the destination searched from the message storage unit 26 are not identical to the supervisor terminal 3. The policy control unit 25 and the message generation unit 27 are instructed to perform processing for requesting confirmation of whether or not mail transmission is possible. In addition, if the error probability is greater than or equal to a specified value as a result of the determination by the mail body check unit 23, a process for requesting the supervisor terminal to confirm whether the message can be transmitted is performed by the policy control unit 25, the message generation unit 27. When the supervisor terminal 3 receives a transmission permission notification, or when the destination is identical or the error probability is lower than a specified value, an e-mail in the unchecked folder of the mail control unit 21 is sent to the transmission folder. Move.

  The policy control unit 25 registers a supervisor for each sender. The specified value for comparison with the error probability is also registered. In addition, when the URL included in the message generated by the message generation unit 27 is designated from the supervisor terminal 3 or the sender terminal 1, a Web page including a permission button and a disabled button is displayed.

  The message storage unit 26 is a database, stores messages transmitted from the sender terminal in the past as shown in FIG. 2 (a), and has been transmitted in the past as shown in FIG. 2 (b). The destination address of the e-mail and the destination are stored in association with each other.

  The message generator 27 generates a message for confirming whether or not the received electronic mail can be transmitted to the supervisor terminal 3 or the sender terminal 1. This message includes the URL of the Web page that displays the allow button and the disallow button.

  The following four cases can be considered as a method for allowing the supervisor to confirm whether or not transmission is possible using the specified value.

  1. If the error probability is above the specified value, only the supervisor will check.

  2. If the error probability is higher than the specified value, be sure to double check by both the sender and the supervisor.

  3. Two specified values are set, and the check by the supervisor has priority over the sender. In other words, the supervisor's specified value 1 and the specified value 2 for the principal are set in a magnitude relationship of (specified value 1 <specified value 2), and if the error probability exceeds the specified value 1, the supervisor checks The sender is urged to confirm only when the error probability is clearly considered to be an error exceeding the specified value 2.

  4). Set two default values and give priority to checks by the sender. That is, the supervisor's prescribed value 1 and the principal's prescribed value 2 are set in a magnitude relationship of (specified value 1> specified value 2), and if the error probability exceeds the specified value 2, it is determined by the sender himself / herself. A check is made and the supervisor is urged to confirm only if the error probability is clearly an error that exceeds the specified value of 2. In this case, the burden on the supervisor is reduced.

  Next, with respect to the overall processing of this system, the above 3. An example will be described in which the supervisor supervises the check with priority. Here, it is assumed that the sender terminal 1 transmits the electronic mail shown in FIG. First, the processing in the destination detection unit 22 will be mainly described with reference to the flowchart of FIG.

  When the sender terminal 1 transmits an e-mail (step 1: indicated as “S1” in the figure, the same applies hereinafter), the message destination confirmation device 2 receives the e-mail by the mail control unit 21 and puts it in an unchecked folder. Save temporarily (step 2).

  The destination detection unit 22 detects a character string indicating a title such as “sama”, “dono”, “middle”, “san”, “kun” from the body of the mail. However, those with quotation marks at the beginning of the line are excluded (step 3). Then, the word preceding the detected character string is set as a destination (temporary) (step 4). In the example of the electronic mail in FIG. 3, “BAR” is the destination (temporary).

  The destination detection unit 22 extracts the transmission destination address of the received electronic mail, searches the message storage unit 26, and obtains the destination (correct) corresponding to the transmission destination address (steps 5 to 7). The search result is a set of character strings composed of a plurality of destinations (positive). In the example of the electronic mail in FIG. 3, since the transmission destination address is “barr@example.com”, when the destination corresponding to this transmission destination address is extracted from the table in FIG. 2B, “BARR” is obtained. Even if the transmission destination address is a mailing list, if it has been transmitted to the mailing list as the same destination in the past, it can be estimated that the mailing list member includes the destination, so that it is treated as a correct destination. Then, after removing the fluctuation of the expression, the identity of the destination (provisional) and the destination (positive) is determined (step 8). Expression fluctuations are handled by using data from multiple users. In addition, it is possible to detect a difference in the organization name of the same surname by extracting the sender name in association with the organization name.

  As a result of the determination, if the destination (provisional) and the destination (primary) are not identical, the confirmation processing unit 24 shifts to a supervisor confirmation process (step 9). If there is a match, the mail body check unit 23 proceeds to a body text check process (step 10).

  Next, the supervisor confirmation process after step 9 will be described with reference to the flowchart of FIG. Here, it is assumed that an electronic mail as shown in FIG. 6 is transmitted.

  When the supervisor check flow is started (step 11), the confirmation processing unit 24 extracts the supervisor of the sender of the email registered in the policy control unit 25 and transmits a confirmation message to the supervisor. To start the process (step 12-14).

  As shown in FIG. 7, the message generation unit 27 attaches an e-mail in question, and sends a message including the URL address of the Web page for requesting permission for transmission and for the supervisor to instruct permission / inhibition. It is generated and transmitted to the supervisor terminal 3 (step 15).

  At the supervisor terminal 3, the supervisor confirms the content of the message and clicks the URL in the message. Then, the policy control unit 25 displays a Web page indicating a permission button and a disabled button as shown in FIG. The supervisor presses either the allow button or the disallow button (step 17).

  If the disable button is pressed, the policy control unit 25 issues an instruction to give an explicit Bad flag to the e-mail (step 18). Then, the mail control unit 21 assigns an explicit Bad flag to the email, copies the email and the Bad flag to the message storage unit 26, stores them, and deletes the email from the unchecked folder ( Step 19). The message storage unit 26 registers an explicit Bad flag for the electronic mail (step 20). Then, the message generating unit 27 transmits an email indicating a sentence to call attention to the sender (steps 21 and 22).

  On the other hand, when the supervisor presses the permission button, the policy control unit 25 issues a transmission request to the mail control unit 21. In the mail control unit 21, the e-mail is moved from the unchecked folder to the transmission folder and copied and stored in the message storage unit 26 without a flag, and the e-mail is transmitted to the destination terminal 4.

  Next, the mail body text checking process after step 10 will be described with reference to the flowchart of FIG.

  When the check process of the mail body is started (step 31), the mail body check unit 23 determines that the received e-mail and the destination address match the past e-mail stored in the message storage unit 26. The correct category and the mismatched category are classified into the incorrect category (steps 32 and 33). When the e-mail shown in FIG. 6 is received, the transmission destination address is “mister.bar@example.com”, and those having the same transmission destination address as shown in FIG. If the destination addresses do not match as shown in FIG. 10B, they are classified into the wrong category. At this time, when the received email and the sender address match among the emails in the message storage unit 26 are classified into the correct category and the incorrect category, only the email sent by the sender himself / herself Therefore, the calculation accuracy of the error probability described later can be improved.

  Then, the mail body check unit 23 performs morphological analysis on the classified body and subject of the electronic mail, and separates the words included in these into romaji. For each word w, calculate the appearance frequency of the word w in the correct category and the appearance frequency of the word w in the error category, and use these to calculate the error probability p (w) indicating the probability of belonging to the error category for each word. Calculate and store in the storage device (step 34). Specifically, it is calculated using the following formula.

p (w) = b / nb / (a * g / ng + b / nb) (1)
g: Number of occurrences of word w in the positive category
ng: Total number of words in the positive category
b: Number of occurrences of word w in the wrong category
nb: Total number of words in the wrong category
a: Weighting factor (here a = 2)
In Expression (1), the appearance frequency of the word w in the correct category is represented by g / ng, and the appearance frequency of the word w in the erroneous category is represented by b / nb. FIG. 11 shows the error probability for each word included in the e-mail shown in FIG.

  Subsequently, the mail text check unit 23 also divides the text and subject of the received electronic mail and converts them into Roman characters. In the example of the electronic mail shown in FIG. 6, “jikai” “sannka” “simasu” “soft” “ball”. Then, the error probabilities corresponding to these words are read from the storage device. At this time, if the top three with the largest values are extracted, sannka (0.99942), soft (0.99942), and ball (0.99942) will be hit. These average values are 0.99942, and this average value is an error probability indicating the probability that this e-mail belongs to the error category.

  Subsequently, the mail body check unit 23 reads the supervisor check specified value 1 and the personal check specified value 2 from the policy control unit 25 (steps 35 and 36). Here, the prescribed value 1 is 0.90 and the prescribed value 2 is 0.9999. First, the error probability finally obtained as an average value is compared with the specified value 2, and if the error probability is equal to or greater than the specified value 2, the process proceeds to a confirmation process for the sender (steps 37 and 38). If the error probability is smaller than the specified value 2, the error probability is compared with the specified value 1. If the error probability is equal to or greater than the specified value 1, the process proceeds to a supervisor confirmation process (steps 39 and 40). The confirmation process for the supervisor is the same as that described with reference to FIGS. On the other hand, when the error probability is smaller than the specified value 1, the e-mail is deleted from the unchecked folder of the mail control unit 21 and moved to the transmission folder, and copied and stored in the message storage unit 26 without a flag. Then, the electronic mail is transmitted to the destination terminal 4 (steps 41 and 42).

  Next, the confirmation process for the sender himself after step 38 will be described using the flowchart of FIG.

  When the personal confirmation process is started (step 51), the confirmation processing unit 24 starts a process of transmitting a confirmation mail to the sender himself / herself, and transmits a confirmation mail from the message generation unit 27 to the sender terminal 1. (Steps 52 and 53). This confirmation mail is the same as that shown in FIG.

  When the sender himself / herself confirms the content of the confirmation mail at the sender terminal 1 and designates the URL included in the confirmation mail, the Web page shown in FIG. 8 is displayed. One of the disabling buttons is pressed (step 55).

  When the disabling button is pressed, the same processing as in steps 18, 19, and 20 shown in FIG. 5 is performed (steps 56, 57, and 58). Then, the transmission of the e-mail is stopped.

  On the other hand, when the permission button is pressed, the same processing as steps 23, 24, and 25 shown in FIG. 5 is performed (steps 59, 60, and 61).

  Therefore, according to the present embodiment, when there is no identity between the destination detected from the body of the received electronic mail and the destination searched from the message storage unit 26 corresponding to the destination address of the electronic mail, By confirming whether or not the e-mail can be transmitted to the sender terminal 3, it is possible to prevent an error in the destination without placing a burden on the sender. In particular, by incorporating a confirmation mechanism by the supervisor, it becomes possible to detect errors that are difficult for the sender to notice. In addition, since the destinations are compared, it is not necessary to pre-register keywords.

  According to the present embodiment, since the destination is generally described before the title in the body of the e-mail, it is ensured by detecting the word before the character string indicating the title. The destination can be detected.

  According to the present embodiment, with respect to the e-mail stored in the message storage unit 26, those that match the received e-mail and the destination address are classified as a correct category, and those that do not match are classified as an incorrect category. Then, using the appearance frequency of the words in the correct category and the appearance frequency of the words in the incorrect category, the error probability belonging to the incorrect category is calculated for each word, and it corresponds to the word included in the received e-mail. When the error probability is equal to or higher than a specified value, the supervisor terminal 3 is requested to confirm whether or not the e-mail can be transmitted. As a result, it is possible to prevent a transmission destination error without imposing a burden on the sender. In particular, by incorporating a confirmation mechanism by the supervisor, it becomes possible to detect errors that are difficult for the sender to notice. Further, since the classification of the e-mail in the message storage unit 26 into the correct category and the incorrect category and the error probability are obtained, it is not necessary to pre-register keywords. Furthermore, since the learning amount used for correct / incorrect determination increases with the operation results, the calculation accuracy of the error probability is improved.

  According to the present embodiment, by classifying the received e-mail and the source address that match with the correct category / wrong category, only the e-mail sent by the same sender in the past is classified as the target. As a result, the calculation accuracy of the error probability can be increased.

  According to the present embodiment, by comparing the average value obtained only from the error probability having a large value with the specified value, the supervisor can be surely confirmed with respect to the e-mail with the suspicious destination.

  In this embodiment, the case where two specified values are set and the supervisor's check is given priority has been described. However, when only the check by the supervisor is performed, only the specified value 1 is set, The flow may be a flow excluding the 9 steps 37 and 38. Further, when performing double check by both the sender and the supervisor, the specified value 1 and the specified value 2 are set to the same value, and the steps 37 and 39 in FIG. 9 may be processed together. When priority is given to the sender's own check, the magnitude relationship between the prescribed value 1 and the prescribed value 2 may be reversed from that of the present embodiment.

  In the present embodiment, the word before the title is detected as the destination, but the present invention is not limited to this. Since the destination is generally described in the upper part of the e-mail text, for example, a word obtained by performing morphological analysis on only the upper three lines of the text may be handled as the destination.

  Further, in the present embodiment, when the emails stored in the message storage unit 26 are classified into the correct category and the incorrect category, only those whose received emails match the source address are classified as targets. However, when the number of target e-mails is small, e-mails sent by others may be classified. In this case, the calculation accuracy of the error probability can be increased as compared with the case where the number of objects is not large.

  In addition, various modifications can be considered for the calculation method of the error probability. For example, the weighting factor a in equation (1) may be set to 1 or may be set to another value. Furthermore, it is conceivable to apply the following Gary Robinson equation instead of the equation (1).

f (w) = b / nb / (g / ng + b / ng)
x = Σf (w) / n, n = ng + nb,
s = 0.001,
When nw: w appears,
p (w) = ((s * x) + (n * f (w))) / (s + n). Then, P, Q, S, and S2 are obtained as follows.

P = 1-((1-p (w1)) * (1-p (w2)) * ... * (1-p (wn))) ^ (1 / n)
Q = 1- (p (w1) * p (w2) * ... * p (wn)) ^ (1 / n)
S = (PQ) / (P + Q)
S2 = (1 + S) / 2
The value of S2 is assumed to be the error probability of e-mail. The same effect can be obtained even when the calculation formula for the error probability is changed.

DESCRIPTION OF SYMBOLS 1 ... Sender terminal 2 ... Message transmission destination confirmation apparatus 3 ... Supervisor terminal 4 ... Transmission destination terminal 21 ... Mail control part 22 ... Destination detection part 23 ... Mail text check part 24 ... Confirmation process part 25 ... Policy control part 26 ... Message accumulator 27 ... Message generator

Claims (5)

A database that stores messages sent in the past,
Receiving means for receiving a message addressed to the destination terminal transmitted from the sender terminal and storing it in the storage means;
Regarding messages in the database, those that match the received message and the destination address are classified into the correct category, and those that do not match are classified into the incorrect category, the appearance frequency of the words in the correct category and the appearance frequency of the words in the incorrect category, The error probability indicating the probability belonging to the error category for each word is calculated and stored in the storage means, and the error probability corresponding to the word included in the received message is read from the storage means and set in advance. A text check means for reading a specified value and determining whether the error probability is equal to or higher than a specified value;
A confirmation processing means for notifying the supervisor terminal whether to confirm whether or not the message can be transmitted when the error probability is a specified value or more;
When transmission permission is obtained from the supervisor terminal, the transmission means for reading the message from the storage means and transmitting to the destination terminal;
A message transmission destination confirmation device.   2. The message transmission destination confirmation according to claim 1, wherein the body check means classifies messages in the database whose received address and source address coincide with each other into a correct category and an incorrect category. apparatus.   2. The text checking means obtains an average of a certain number of error probabilities from a larger value among the error probabilities read from the storage means, and compares the average value with a specified value. Or the message transmission destination confirmation apparatus of 2 description. Memorizing past messages sent by the database;
Receiving the message addressed to the destination terminal transmitted from the sender terminal by the receiving means and storing it in the storage means;
The body check means classifies messages in the database that match the received message with the destination address into the correct category, and those that do not match into the incorrect category. An error probability indicating the probability of belonging to the error category for each word is calculated using the word appearance frequency and stored in the storage means, and the error probability corresponding to the word included in the received message is read from the storage means in advance. Reading the specified value that has been set, and determining whether the error probability is greater than or equal to the specified value;
A step of notifying the supervisor terminal for confirmation of whether or not the message can be transmitted when the error probability is equal to or higher than a specified value by the confirmation processing unit;
When transmission permission is obtained from the supervisor terminal by the transmitting means, the message is read from the storage means and transmitted to the destination terminal;
A message destination confirmation method characterized by comprising: Processing to store messages sent in the past in the database;
A process of receiving a message addressed to a destination terminal transmitted from a sender terminal and storing it in a storage means;
Regarding messages in the database, those that match the received message and the destination address are classified into the correct category, and those that do not match are classified into the incorrect category, the appearance frequency of the words in the correct category and the appearance frequency of the words in the incorrect category, The error probability indicating the probability belonging to the error category for each word is calculated and stored in the storage means, and the error probability corresponding to the word included in the received message is read from the storage means and set in advance. A process of reading the specified value and determining whether the error probability is greater than or equal to the specified value;
When the error probability is equal to or higher than a specified value, a process for notifying the supervisor terminal to confirm whether the message can be transmitted;
When transmission permission is obtained from the supervisor terminal, the process of reading the message from the storage means and transmitting to the destination terminal;
A message transmission destination confirmation program for causing a computer to execute.

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