JP2011248901A - Mail error transmission prevention device, mail error transmission prevention method and mail error transmission prevention program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mail error transmission prevention device, a mail error transmission prevention method, and a mail error transmission prevention program for preventing error transmission of mails and to prevent error transmission of mail which is confident.SOLUTION: A mail transmitter 1 prepares a mail and sends it. The transmitted mail is temporally held in a transmission server. The held mail is forwarded to a management server 7. The management server 7 detects the security level of the mail from the words in the text of the mail forwarded and detects the security level of the recipient of the destination. When the security level of the mail detected is smaller than or the same as the security level of the recipient, the mail is sent as such, and when greater, the mail transmitter 1 is informed of an alarm. The mail transmitter 1 instructs the transmission or stop instruction of transmission so that the transmission or stop of transmission is performed according to the operation.

Description

  The present invention relates to an erroneous email transmission prevention device, an erroneous email transmission prevention method, and an erroneous email transmission prevention program for preventing erroneous transmission when an email is transmitted.

  When an electronic mail is transmitted in business, it is desirable to assume the security level of the contents in advance, and transmit and browse only to those who meet the security level (recipient).

Therefore, conventionally, when a document including a preset keyword is transmitted to the outside as a confidential document, there is a technique of temporarily storing the document without transmitting and notifying the administrator (Patent Document 1).
JP 2005-277786 A

  In the technique of Patent Document 1 described above, a document including a keyword set in advance can not be sent to the outside as a confidential document. However, if the keyword to be set is incorrect, there is a risk that even confidential information will be sent to the outside and leaked. On the other hand, if the keyword to be set is too strict, anything will be judged as a confidential document and will not be sent to the outside. The problem was that it interfered with daily work.

  In order to solve these problems, the present invention stores a history of the security level and frequency of words in a transmission mail in a table, and determines the security level of the transmission mail determined based on the table and the reception of the transmission mail. Compared with the security level of the sender, the sent mail is sent as it is, warned and sent / discontinued at the discretion of the sender, and the security level of the sent mail and the recipient is corrected as necessary.

  The present invention stores a security level of words in a transmission mail and a history of the frequency in a table, and compares the security level of the transmission mail determined based on the table with the security level of the recipient of the transmission mail. Sending outgoing mail as it is, warning and sending / canceling at the sender's discretion, and correcting the security level of outgoing mail and recipients as necessary to prevent mistransmission of confidential emails Is possible.

  The present invention stores a security level of words in a transmission mail and a history of the frequency in a table, and compares the security level of the transmission mail determined based on the table with the security level of the recipient of the transmission mail. Sending mail as it is, warning and sending / stopping transmission at the sender's discretion, and correcting the security level of the sending mail and recipient as necessary.

FIG. 1 shows a system configuration diagram of the present invention.
In FIG. 1, a mail sender 1 is a person who sends a mail. For example, the mail sender 1 installs a mail application on a personal computer, creates a mail on the mail application, and sends it to a destination.

  The mail recipient 2 is a person (mail recipient) to whom the mail is sent from the mail sender 1, and for example, installs a mail application on a personal computer and performs a mail reception operation on the mail application. The mail is downloaded from its own mail box 23 in the internal POP server 6 and read.

  The network 3 is a network for transmitting mail, such as a LAN or the Internet.

  The WEB server 4 is a server for creating and sending a mail on the WWW screen. Here, when the mail created on the WWW screen is to be sent, it is passed to the management server 7 (or Sent to the management server 7 via the SMTP server 5 for the mail sender), sent when the transmission instruction is issued from the management server 7, and stopped when the transmission stop instruction is issued, or a warning screen is displayed. 1 to be downloaded and referred to (see FIGS. 2 to 13).

  The mail sender / receiver SMTP server 5 is a server (SMTP server) for sending mail created by the mail sender 1 on the mail application installed in his / her personal computer. Is sent to the management server 7 or transmitted when a transmission instruction is issued from the management server 7, and the transmission is stopped when a transmission cancellation instruction is issued (see FIGS. 2 to 13). .

  The mail receiver POP server 6 is a server for the mail receiver 2 to download and read mail addressed to the mail BOX 23, and is composed of a received mail DB 22 and the like. is there.

  The received mail DB 22 receives the mail of the mail recipient 2 and saves it in the mail BOX 23 for each mail recipient 1 and checks the user ID and password from the mail recipient 1 to download it when authenticated. Or allow it.

  The mail BOX 23 is a box (directory) that stores mail for each mail recipient 2.

  The management server 7 holds the mail once when trying to send the mail created by the mail sender 1, sends a transmission instruction when it is determined that the transmission is permitted, and refuses transmission (discontinuation of transmission). When the determination is made, an instruction to stop transmission is given and a warning is sent to the mail sender 1 (see FIGS. 2 to 13). The management server 7 is composed of 11 to 21.

  The word security level determination means 11 determines the security level of the words in the mail (see FIGS. 2 to 13).

  The outgoing mail security level determination means 12 determines the security level of outgoing mail (see FIGS. 2 to 13).

  Recipient security level determination means 13 determines the security level of the mail recipient (see FIGS. 2 to 13).

  The security level match determination unit 14 compares the security level of the mail to be transmitted with the security level of the recipient of the mail, and determines whether the transmission is allowed or not (FIG. 2). To FIG. 13).

  The recipient security level correction means 15 corrects the security level of the mail recipient (see FIGS. 2 to 13).

  The outgoing mail security level correction means 16 corrects the security level of the mail to be sent (see FIGS. 2 to 13).

  The receiver security level table 17 manages the security level of the receiver (see FIG. 10).

  The word security level determination table 18 is a table in which information for determining the security level of words in an email is registered (see FIG. 10).

  The transmission mail security level determination table 19 is a table in which information for determining the security level of mail to be transmitted is registered (see FIG. 10).

  The recipient security level list 20 is for registering and storing the security level of the recipient (see FIG. 10).

The document DB 21 stores mail.
Next, the overall operation of the configuration of FIG. 1 will be described according to the order of the flowchart of FIG.

  FIG. 2 shows a flowchart (overall) for explaining the operation of the present invention. Here, the mail sender 1, the management server 7 (transmission server 5), the reception server 6, and the mail receiver 2 are the mail sender 1, the management server 7 (SMTP server 5 for mail sender), and the mail reception of FIG. Correspond to the POP server 6 for mail and the mail receiver 2 respectively.

  In FIG. 2, in S1, the mail sender 1 creates a mail. For example, the mail sender 1 of FIG. 1 sets the mail address of the destination after describing the mail text on the mail application.

In S2, the mail is transmitted. This sends the mail created in Sl.
In step S3, the mail transmitted in step S2 is received. This is because the mail sender SMTP server 5 in FIG. 1 receives the mail transmitted in S 2 and temporarily holds the mail, and passes the received mail to the management server 7.

In S4, the management server 7 detects the security level of the mail.
In S5, the management server 7 detects the security level of the mail recipient. These S4 and S5 detect the security level of the mail and the security level of the recipient (destination) of the mail (see FIGS. 2 to 13) for the mail received by the management server 7 in S3.

  S6 determines. When the security level of the mail detected in S4 and S5 is lower than or equal to the security level of the mail recipient, it is determined that the transmission is S7, and when it is higher, the warning is determined as S8. When it is determined as a warning, a process of notifying the mail sender 1 of a warning message, instructing the mail sender to either send or stop sending, and sending in S9 or sending in S10 according to the instruction I do. If it is determined that the transmissions in S7 and S9 are made, the mail is transmitted to the destination mail BOX 23 and stored in S11.

  In S12, the mail recipient 2 downloads and refers to the mail from his mail BOX 23.

  As described above, when the mail sender 1 creates and sends a mail, the sent mail is temporarily stored in the transmission server, the stored mail is passed to the management server 7, and the management server 7 is passed. The security level of the email is detected from the words in the body of the email and the security level of the recipient of the email is detected. When the security level of the detected email is less than or equal to the security level of the recipient, it is sent as is. On the other hand, when it is large, a warning is sent to the mail sender 1, and the mail sender 1 instructs to send or stop sending, and sends or stops sending according to the instruction. Thus, it is possible to prevent an important mail from being erroneously transmitted to a destination such as outside the company. Details will be sequentially described below.

FIG. 3 shows a sharp flowchart of the operation of the present invention.
In FIG. 3, S21 determines whether there is a security level setting for the outgoing mail. This determines whether the setting of the security level of the outgoing mail has been specified. In the case of YES, in S22, as shown in FIG. 1 described later, the mail sender 1 sets the security level of the outgoing mail, and the process proceeds to S24 of X in FIG. On the other hand, if NO, the process proceeds to S23.

  S23 determines the security level of the outgoing mail. This determines the security level of the outgoing mail as shown in FIG.

  S24 determines the security level of the recipient. This determines the security level of the mail recipient (destination) as shown in FIG.

  In S25, it is determined whether the security level of the outgoing mail is equal to or lower than the security level of the recipient. In the case of YES, since it is found that the security level of the outgoing mail is lower than or equal to the security level of the recipient of the outgoing mail and transmission is permitted, transmission is executed in S26. On the other hand, in the case of NO, since it is found that transmission is not permitted, the process proceeds to S28.

  S28 warns. Since it is determined that transmission is not permitted in NO in S25, a warning is sent to the mail sender 1 (warning that the security level of the outgoing mail is higher than the security level of the mail recipient 2 and that transmission is not allowed). . For example, as shown in FIG. 12, which will be described later, when a transmission mail is regarded as an error, an error notification mail is transmitted to the mail sender 1 and received, and when a home page address (URL) described in the error message is clicked, the URL Display the warning message in the tribute to inform.

In step S29, it is determined whether the transmission is performed while ignoring the warning. In step S42, it is determined whether the mail sender 1 has pressed the forcible transmission or transmission stop button in a state where the warning is notified to the mail sender 1 in S28 (S42). If YES is determined (when the mail sender 1 presses the forced transmission button), the process proceeds to S31. If it is determined NO (when the mail sender 1 presses the transmission stop button), the transmission is stopped in S30 and the process ends.

  In step S31, it is determined whether to correct the security level of the recipient. If the mail sender 1 instructs YES, since the security level of the outgoing mail is higher than the security level of the recipient and it is determined that the transmission is not permitted (NO in S25), the direction to cancel the state in S32 The security level of the recipient is corrected so as to be increased, here increased by one, transmission is executed in S26, and the process proceeds to S27. On the other hand, in the case of NO in S31, the security level of the outgoing mail is corrected so that the state is canceled in S33, here it is reduced by one, transmission is executed in S26, and the process proceeds to S27.

  In step S27, the number of appearances of all words included in the corresponding email at the security level is added. This is performed by adding the number of words in the column of the word in which the security level of the current transmission mail appears in the word security level determination table 18 in FIG. 10A for all words included in the transmission mail. Accumulate the number of words that appear at the email security level.

  As described above, when the outgoing mail is received, the security level of the outgoing mail and the security level of the recipient of the outgoing mail are determined (S23, S24, FIGS. 6 and 7), and the security level of the outgoing mail is the security level of the recipient. When it is less than or equal to the level, it is transmitted, and when it is larger, the mail sender 1 is warned (S28) that transmission is not permitted. When the mail sender 1 selects forced transmission or transmission suspension, As long as the security level of the recipient exists, the security level of the outgoing mail can be automatically corrected and sent, and if the transmission is canceled, the transmission is stopped. Then, it is possible to automatically update the word security level determination table 18 in FIG. 10A by extracting all the words included in the transmitted mail and adding the number of appearances in the current mail security level column. Become.

FIG. 4 shows a flowchart for explaining the operation of the present invention (creation of a word list).
In FIG. 4, S51 refers to the security level of the mail (text document). This refers to the security level of the mail (transmitted mail) (the determined security level of the transmitted mail in FIG. 6).

  In step S52, the word n is extracted. This extracts the word n (n = 1, 2, 3,...) From the document in the mail text.

  S53 determines whether the word is a new word. It is determined whether the word n extracted in S52 is a new word that is not registered in the word security level determination table 18 of FIG. In the case of YES, in S54, the word entry is added to the word security level determination table 18 to register the word, and the process proceeds to S55. On the other hand, if NO, the process proceeds to S55.

  In S55, the number of appearances of the corresponding mail at the security level is added to the corresponding word in the word security level determination table 18. As a result, the number of appearances of the word n that appears in the column of the security level of the mail referred to in S51 is incremented by one.

  S56 determines whether there are other words. In the case of YES, S52 and the subsequent steps are repeated, and when new, an entry is added to the word security level determination table 18 in FIG. 10A, and the word is registered and added to the security level column of the current mail. On the other hand, if it is not a new word, 1 is added to the column of the security level of the current mail of the corresponding word in the word security level determination table 18 and accumulated.

  As described above, the word security level determination table 18 in FIG. 10A can be automatically renewed based on the security level of the mail and the number of appearances of the word that appears in the mail.

FIG. 5 is a flowchart for explaining the operation of the present invention (word security level determination).
In FIG. 5, S61 refers to the appearance rate of the security level “D”. For example, one word “XY trading service” is extracted from the word security level determination table 18 in FIG. 10A, and the appearance rate “20”% of the security level “D” of the word is referred to. .

  In S62, it is determined whether there is a higher security level and a higher appearance rate. This is, for example, above the security level “D” (here, the lowest) of the word “XY trading service” in the word security level determination table 18 of FIG. ) Is determined whether there is an appearance rate higher than 20% of D. Here, C (33%) is found at the first time (B (90%) at the second time and A (60%) at the third time), so the answer is YES and the process proceeds to S63. On the other hand, if NO, the process ends.

  In S63, it is determined whether the difference in appearance rate from the level is 20 or more. In the above example, for 20% of D, 33% of 3 in the first time, the difference is 13 and does not become 20 or more, it becomes NO, it is determined whether there is the next security level in S65, and YES because there is B S62 and subsequent steps are repeated. When reaching A in S65, there is no further security level, so S65 is NO and the process proceeds to S66. On the other hand, in the case of YES in S63 (when 90% of B in the second time, the difference from 20% of D is 70 and 30 or more, YES), it is added to the provisional security level list in S64, and in S65 If there is a next security level, S62 and subsequent steps are repeated.

  By performing the above processing, in the case of the word “service for XY trading” in FIG. 10A, B and A that are larger than 20% of D and differ by 30% or more are provisional security levels. Will be added to the list.

In S66, the temporary security level list having the largest difference in appearance rate from D is extracted. The above example
For B, the difference in appearance rate from D is (90-20) = 70%
A has a difference in appearance rate from D to (60-20) = 40%
Since the difference in the appearance rate from D is the largest here, it is B, so that B is determined (determined) as the security level of the word “service for XY trading”.

  As described above, it is possible to automatically determine the security level of the word appearing in the outgoing mail.

  FIG. 6 is a flowchart for explaining the operation of the present invention (transmission mail security level determination).

  In FIG. 6, S71 performs a full text search. This searches the body of the outgoing mail and extracts words. Then, the security level for each word is determined according to the flowchart of FIG.

  S72 determines whether there is a word of security level n. This loops in order with C, B, A, starting from the lowest D of the security level (loop between S72 and S74). For the first time, it is determined whether a word of security level D is present in the outgoing mail. In the case of YES, in S73, 1 is added to the level (initially D) in the column of the number of words of the corresponding level in the outgoing mail security level determination table 19 in FIG. 10B, and the process proceeds to S74. On the other hand, if NO, the process proceeds to S74.

  S74 determines whether there is another level. In the case of YES, S72 and subsequent steps are repeated. If NO, the process proceeds to S75.

  Through the above S71 to S74, the security level of all words extracted from the transmission mail (security level determined according to the flowchart of FIG. 5 described above) is stored in the transmission mail security level determination table 19 of FIG. It is possible to set (cumulate) the number of words (number of appearances) for each level.

  In S75, the highest level that appears in the outgoing mail security level determination table 19 is extracted, and this is determined as the security level of the outgoing mail. For example, in the case of the transmission mail security level determination table 19 in FIG. 10B, the security level of the transmission mail is determined as B.

  As described above, the security level for each word is determined in the flowchart of FIG. 5 described above for the word extracted from the transmission mail, and the frequency of the security level of these determined words in the flowchart of FIG. It is possible to automatically determine the highest level as the security level of the transmission mail by setting it in the transmission mail security level determination table 19 of b).

  FIG. 7 is a flowchart for explaining the operation of the present invention (recipient security level determination).

  In FIG. 7, S81 refers to the current recipient security level table n. This refers to, for example, n = recipient 1001 in the recipient security level table 17 of FIG.

S82 determines whether the security level is D or not. In the case of YES, it is determined that the current security level of the recipient is D, so the security level is “D” in S83.
And finish. If NO, the process proceeds to S84.

  In step S84, it is determined whether there is a mail reception calendar that is equal to or higher than the security level of the current recipient within the past month. This is because, for example, for the first recipient 1001 in the recipient security level table 17 of FIG. 10C, the security level of the recipient is “C” (NO in S82), so the current recipient If there is a reception calendar with a security level of “C” or higher within the past month, since there are “2” times at the B level, YES in S84, and the process proceeds to S87. On the other hand, in the case of NO in S84, the process proceeds to S85.

  In S85, it is determined whether the security level is D. This is because, in S84 NO, it has been found that there has been no email reception calendar that is equal to or higher than the security level of the current recipient within the past month, so in S85, whether the security level of the recipient is “D” (lowest). Determine. In the case of YES, since it is the lowest, in S83, the security level determination is determined as “D” as it is. On the other hand, in the case of NO, the security level is lowered by n−1, that is, by 1 in S86. For example, if the security level of the current recipient is C, it is determined as D.

  In step S87, it is determined whether or not an email having the current security level or higher has been received three or more times within the past month. In the case of YES, the security level is determined as n (as it is) in S88. If no, the process proceeds to S85.

  By referring to the security level of the current recipient as described above, if the mail reception calendar with a high security level is 3 times or more within one month, the security level of the recipient is taken as it is, and if it is not more than 3 times within one month, the security level If the security level is D (lowest), the security level of the recipient can be automatically determined based on the past mail reception calendar. The number and period of the reception calendar are arbitrarily adjusted, and when the number of reception calendars higher than the current security level is a predetermined threshold (for example, 10) or more, the security level of the receiver is increased by one. Also good.

  FIG. 8 is a flowchart for explaining the operation of the present invention (correction of the security level of the recipient).

  In FIG. 8, S91 refers to the security level of the outgoing mail. This refers to the security level determined for the outgoing mail in FIG. 10B described above, for example, B shown in the figure.

  In S92, 1 point is given to the mail transmission history of the corresponding security level to the recipient. For example, 1 is added to “2” of the B level in the entry of the recipient 1001 in the recipient security level table 17 of FIG.

  In S93, it is determined whether the level is higher than the current level. This is added in S92 to determine whether the B level in the entry of the recipient 1001 in the recipient security level table 17 of FIG. 10C is higher than the current level, here C. Therefore, it progresses to S94. On the other hand, if NO, the process ends.

  S94 determines whether or not the same level of mail has been received within the past month. In the above example, since the B level is received, the answer is YES, and the process proceeds to S95. On the other hand, if NO, the process ends.

  In S95, it is determined whether or not the same level of mail has been received three times or more within the past month. In the above example, since it is three times within one month of (c) in FIG. 10, the answer is YES, and the process proceeds to S96. On the other hand, if NO, the process ends.

  In S96, in the case of YES in S95, the security level of the recipient is increased by one rank. In the above example, the security level of the receiver ID = 1001 in FIG. 10C is increased by one rank from C to B, and is updated with the security level B after reception shown in the figure.

  As described above, every time the recipient receives the outgoing mail, as shown in the recipient security level table 17 in FIG. 10C, the recipient is added to the corresponding level in the recipient's mail reception history within the past month. The cumulative history of the security level of outgoing mail received by the recipient is saved, and the security level of the received outgoing mail is raised by raising the security level of the recipient by one when it exceeds 3 times. It is possible to automatically correct the security level of the recipient. Furthermore, the security level of the receiver may be lowered by one when only the lower level becomes a predetermined number of times (for example, three times or more) in a predetermined period (for example, one month).

  FIG. 9 is a flowchart for explaining the operation of the present invention (security level correction for outgoing mail).

In FIG. 9, S101 refers to the current security level of the mail recipient.
SIO2 changes the security level of outgoing mail to the current security level of the mail recipient. This corrects the security level of the outgoing mail to match the current security level of the mail recipient.

  As described above, the security level of the transmission mail is set to the security level of the recipient, and it is possible to automatically adjust the transmission mail so as to be transmitted in the above-described YES and S26 of S25 in FIG.

FIG. 10 shows an example table of the present invention.
FIG. 10A shows an example of a word security level determination table. The word security level determination table 18 registers and manages the number of appearances of words in association with the security level of the outgoing mail and determines the word security level. Here, the following information shown in the figure is used. This is for registering and determining in association with each other.

·word:
・ Number of appearances:
・ Security level:
・ A:
・ B:
・ C:
・ D:
Here, the word is a word that appears in the outgoing mail. The number of appearances is the number that appears in the mail for each security level. The security level is a security level of the outgoing mail, and represents a four-stage level of A, B, C, and D (A is high and D is low).

  FIG. 10B shows an example of an outgoing mail security level determination table. The outgoing mail security level determination table 19 is for determining the security level of outgoing mail, and here is for determining by registering the following information in association with each other.

・ Security level (word):
・ Number of words:
・ Judgment:
Here, the security level is the security level of the word that appears in the outgoing mail. The number of words is the number of words that appear for each security level. The determination shows a state in which the highest security level is determined as the security level of the outgoing mail here.

  FIG. 10C shows an example of a recipient security level table. The recipient security level table 17 registers and manages the following information shown in association with the recipient ID.

・ Recipient ID:
-Security level of outgoing mail received this time:
・ Recipient security level:
·Current:
・ After receiving:
・ Email reception calendar within one month:
・ A level:
・ B level:
・ C level:
・ D level:
Here, the recipient ID is the ID of the mail recipient (destination). The security level of the outgoing mail received this time is the security level of the outgoing mail received this time. The security level of the recipient is the current level and the level after receiving the mail. It is a mail reception calendar within one month, and is accumulated in four stages of A, B, C, and D.

  FIG. 10D shows an example of a recipient security level list. The recipient security level list 20 registers and manages the following information shown in association with each other.

・ Recipient ID:
·Affiliation:
・ Security level:
FIG. 11 is a flowchart for explaining the operation of the present invention (setting the security level of outgoing mail).

  In FIG. 11A, Slll creates a text. This is because the mail sender 1 creates the body of the mail.

  S112 sets the security level of outgoing mail. In this case, the mail sender 1 sets the security level of the transmitted mail. And it progresses to X of FIG. 3, and performs after S24.

  When the mail sender 1 creates a mail by the above Sll1 and Sll12, the security level of the mail is arbitrarily set, so that it can be continued from S24 in FIG. Thus, it is possible to easily increase or decrease the security during transmission.

In FIG. 11B, S121 extracts past mail.
In step S122, the outgoing mail security level is set, and the recipient security level is set. In this case, for the past mail extracted in S121, the mail sender 1 sets the security level and the recipient security level of the transmitted mail.

  In S123, a word security level determination table is created and a recipient security level table is created. In step S122, the word security level determination table 18 and the recipient security level table 17 are automatically created based on the emails for which the outgoing mail security level and the recipient security level are set.

  As described above, the mail sender 1 sets the outgoing mail security level and the recipient security level for the mail based on the past mail, and determines the word security level based on the set outgoing mail and the security level of the recipient. The table 18 and the recipient security level table 17 can be automatically created.

FIG. 12 is a flowchart for explaining the operation of the present invention (warning).
In FIG. 12A, in S131, the SMTP server 5 transmits an error mail. In this case, when the mail sender 1 is notified of the transmission disapproval warning in S28 of FIG. 3, the mail received by the SMTP server 5 from the mail sender 1 is returned as an error message.

  In S132, the mail sender 1 opens the error mail. This downloads and opens the mail returned from the SMTP server 5 from the receiving server (POP server).

  In S133, the link is clicked. This is done by clicking a link (URL) pasted on the warning message described in the opened error message.

  In response to the click in S133, S134 and S135 download the page of the clicked URL from the WEB server 4, and display the tribute warning screen on the display device of the mail sender 1. The warning screen is, for example, the screen shown in FIG.

  As described above, when the mail sender 1 sends a mail and the transmission is not permitted by the management server 7 (S25NO in FIG. 3), an error mail is returned to the mail sender 1 and the error mail is opened. When the e-mail sender 1 clicks the corresponding warning message, the contribution of the corresponding URL is automatically downloaded, and the detailed warning screen shown in FIG. 13A can be displayed.

  In FIG. 12B, in S141, the management server 7 notifies the WEB server 4 of a warning.

In S142, the WEB server 4 creates a warning screen.
In S143, the mail sender 1 displays a warning screen.

  As described above, when the management server 7 does not permit transmission, it is possible to automatically notify the WEB server 4 of the warning content of FIG. 13A and create and store a warning screen at the corresponding URL. Become. Then, the link of the corresponding URL in the error mail is clicked in S133 of FIG. 12A described above, and a warning screen is downloaded from the WEB server 4 and displayed on the display device of the mail sender 1's personal computer. It becomes possible.

FIG. 13 shows an example of the screen of the present invention.
FIG. 13A shows a warning screen example (1). The illustrated warning screen example (1) shows an example in which the warning in S28 of FIG. 3 described above is displayed.
“The email you are trying to send exceeds the security level of the recipient. Please check.”
Etc. and informing the mail sender 1
・ Cancel transmission ・ There is a button for forced transmission, and when the mail sender 1 selects and clicks one of them, an instruction to execute the processing of S29 to S33 and S26 in FIG. 2 described above (forced transmission and transmission stop) is given. It becomes possible.

FIG. 13B shows a warning screen example (2). The illustrated warning screen example (2) is an example of the screen displayed when the mail sender 1 clicks the “forced transmission” button in the warning screen example (1) of FIG.
“Your email was forcibly sent.

Recipient security level table was updated. "
Etc. are displayed to inform the mail sender 1.

(Appendix 1)
In the wrong email sending prevention system that prevents sending wrong emails when sending emails,
A first table for storing a history of the frequency of words in an email to be transmitted in association with the security level of the email;
A second table for storing the number of transmissions of the mail to be transmitted to the recipient in association with the security level of the recipient;
Means for determining a security level of the mail by referring to the first table when sending the mail;
Means for determining the security level of the recipient of the mail by referring to the second table when sending the mail;
Means for comparing the security level of the determined mail with the security level of the determined recipient of the mail;
An email mistransmission prevention system, comprising: means for transmitting or canceling the email based on the comparison result.

(Appendix 2)
2. The erroneous mail transmission prevention according to claim 1, wherein, as a result of the comparison, the message is transmitted when the security level of the mail recipient is greater than or equal to the security level of the mail, and a warning message is notified to the sender when the security level is lower. system.

(Appendix 3)
The system for preventing erroneous mail transmission according to appendix 2, wherein a mail is transmitted when a transmission instruction is received from a sender who has received the warning message.

(Appendix 4)
As a result of the comparison, when the security level of the mail recipient is lower than the security level of the mail, the security level of the mail or the security level of the recipient is corrected to facilitate transmission. 4. The erroneous email transmission prevention system according to any one of 3 above.

(Appendix 5)
On the computer,
Means for determining a security level of the mail by referring to a first table that stores a history of the frequency of words in the mail to be transmitted in association with the security level of the mail when sending the mail;
Means for determining the security level of a recipient of the mail by referring to a second table that stores the number of transmissions of the mail to be sent to the recipient in association with the security level of the recipient at the time of sending the mail; ,
Means for comparing the security level of the determined mail with the security level of the determined recipient of the mail;
An erroneous mail transmission prevention program for functioning as means for transmitting or canceling mail transmission based on the comparison result.

It is a system configuration diagram of the present invention. It is an operation | movement description flowchart (whole) of this invention. It is an operation explanatory flowchart of the present invention (transmission mail and recipient security level match determination). It is an operation | movement explanatory flowchart (creation of a word list) of this invention. It is an operation | movement explanatory flowchart (word security level determination) of this invention. It is an operation explanation flowchart (security level determination of outgoing mail) of the present invention. It is an operation | movement explanatory flowchart (recipient security level determination) of this invention. It is an operation | movement explanatory flowchart (recipient security level correction | amendment) of this invention. It is an operation explanation flowchart (security level correction of outgoing mail) of the present invention. It is an example table of this invention. It is operation | movement explanatory flowchart (setting the security level of outgoing mail) of this invention. It is operation | movement description flowchart (warning) of this invention. It is an example of a screen of the present invention.

1: Mail sender 2: Mail receiver 3: Network 4: WEB server 5: SMTP server for mail sender (SMTP server)
6: POP server for mail recipients (POP server)
7: Management server 11: Word security level determination means 12: Outgoing mail security level determination means 13: Recipient security level determination means 14: Security level match determination means 15: Recipient security level correction means 16: Outgoing mail security level correction means 17: Recipient security level table 18: Word security level determination table 19: Outgoing mail security level determination table 20: Recipient security level list 21: Document DB
22: Received mail DB
23: Mail BOX

Claims (6)

In the erroneous email transmission prevention device that prevents erroneous transmission when sending email,
A first table for storing a word for searching for an email in association with a security level;
Mail receiving means for receiving mail;
Means for referring to the first table from the mail and searching for a word contained in the mail to determine a security level;
Based on the determined security level, determination means for determining transmission or suspension of the mail;
A transmission means for transmitting the mail when the determination means determines transmission;
A notification means for notifying a sender of a warning message when the determination means determines that transmission is to be stopped;
A transmission means for transmitting the mail when a transmission instruction corresponding to the warning message is received;
A mail erroneous transmission preventing apparatus, comprising: a transmission canceling unit that cancels transmission of the mail when a transmission cancel instruction corresponding to the warning message is received. The notification means includes
Create a warning screen,
The apparatus according to claim 1, wherein an error mail including a link indicating the warning screen is transmitted to a sender.   3. The erroneous mail transmission prevention device according to claim 2, wherein the warning screen includes a transmission or transmission stop button, and receives a transmission or transmission stop instruction. A second table for storing email recipients in association with security levels;
2. The erroneous mail transmission prevention apparatus according to claim 1, further comprising means for determining a security level of the mail recipient with reference to the second table. A method of preventing erroneous email transmission executed by a management server that stores a first table for storing a word for searching for email in association with a security level,
Mail receiving process to receive mail,
A process of referring to the first table and searching for a word included in the mail to determine a security level;
Based on the determined security level, a determination process for transmitting or canceling transmission of the mail;
A notification process for notifying the sender of a warning message when transmission is stopped in the determination process;
When a transmission instruction corresponding to the notification of the warning message is received, a transmission process for transmitting the mail;
A method of preventing erroneous mail transmission, comprising: performing a transmission cancellation process for canceling the transmission of the mail in the management server when a transmission cancellation instruction corresponding to the warning message is received. A mail mistransmission prevention program to be executed by a management server that stores a first table for storing a word for searching for a mail in association with a security level,
Mail receiving process to receive mail,
A process of referring to the first table and searching for a word included in the mail to determine a security level;
Based on the determined security level, a determination process for transmitting or canceling the transmission of the mail;
A notification process for notifying the sender of a warning message when transmission is stopped by the determination means;
A transmission process for transmitting the received mail when receiving a transmission instruction corresponding to the notification of the warning message;
A mail mistransmission prevention program for causing a management server to execute a transmission cancellation process for canceling the transmission of mail when a transmission cancellation instruction corresponding to the warning message is received.

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