JP6802070B2 - Adjustment program and adjustment device - Google Patents

Description

The present invention relates to an adjustment program and an adjustment device for adjusting time.

The conventional e-mail mis-sending prevention system has a function to check specific keywords such as "top secret" and "confidential" in the e-mail, a function to prevent transmission of a specific attachment file format, and a specific sender's e-mail address. It has a function that does not allow transmission depending on the combination with the destination email address, and prevents erroneous transmission such as information leakage according to a preset filter rule.

In addition, there is software that allows the sender to cancel the transmission by holding the mail that may have been erroneously sent for a certain period of time after being detected by the filter rule. For example, the system of Patent Document 1 below comprises a policy determination unit that determines whether or not to send an e-mail, and a proxy server function unit that determines whether or not to send an e-mail to an e-mail server device according to the determination result. , Transmission is controlled to prevent leakage of information itself.

Japanese Unexamined Patent Publication No. 2011-215985

However, conventional systems limit transmission according to predetermined content filter rules. Therefore, if you want to change the mail hold time due to the cause of mis-sending that was found after the introduction, such as the problem of mis-sending that is specific to the organization and individual, you have to change the content filter rule set in the system. Therefore, when it is desired to cancel the sent mail held on the server, there is a problem that the cancellation may not be in time depending on the sender and the mail may be erroneously sent due to the elapse of the holding time.

An object of the present invention is to optimize the holding time required for canceling an e-mail from being transmitted from the source to reaching the destination.

The adjustment program and adjustment device according to the first aspect of the invention disclosed in the present application are a first reception process in which a processor receives an e-mail from a source to a destination from the source, and a first reception process. A hold process for holding the received e-mail in a predetermined hold time storage device, a second receive process for receiving a cancellation instruction for sending the e-mail from the sender, and a second receive process within the hold time. If the cancellation instruction is not received, the e-mail is sent to the destination after the hold time has elapsed, and if the cancel instruction is received within the hold time, the e-mail is not sent to the destination. When the cancellation instruction is received within the hold time, the number of e-mails whose transmission has been canceled in the past by the transmission process and the number of e-mails included in the e-mail are included in the e-mail group. A first calculation process for calculating an erroneous transmission score indicating whether or not the e-mail is an erroneously transmitted e-mail sent by the sender based on the number of cases including a word, and the first calculation process. Based on the erroneous transmission score calculated by the above, the adjustment process for adjusting the holding time to increase is executed.
The adjustment program and the adjustment device according to the second aspect of the invention disclosed in the present application include a first reception process for receiving an e-mail from a source to a destination from the source, and an electron received by the first reception process. A hold process for holding an email in a predetermined hold time storage device, a second reception process for receiving a cancellation instruction for sending the e-mail from the sender, and a cancellation instruction within the hold time by the second reception process. If the e-mail is sent to the destination after the hold time has elapsed, and if the cancellation instruction is received within the hold time, the e-mail is not sent to the destination. If the cancellation instruction is received within the hold time, an error indicating whether or not the email is an erroneously sent email from the sender based on the length of the creation time of the email. It is characterized by executing a first calculation process for calculating a transmission score and an adjustment process for adjusting the holding time so as to increase based on the erroneous transmission score calculated by the first calculation process.
The adjustment program and adjustment device, which are the third aspects of the invention disclosed in the present application, include a first reception process for receiving an e-mail from a source to a destination from the source, and an electron received by the first reception process. A hold process for holding an email in a predetermined hold time storage device, a second reception process for receiving a cancellation instruction for sending the e-mail from the sender, and a cancellation instruction within the hold time by the second reception process. If the e-mail is sent to the destination after the hold time has elapsed, and if the cancellation instruction is received within the hold time, the e-mail is not sent to the destination. If the cancellation instruction is received within the hold time, the email is erroneously sent by the sender based on the presence or absence in the message of the email with the name described in the destination header of the email. Adjustment to increase the hold time based on the first calculation process that calculates the erroneous transmission score indicating whether or not the email is erroneously sent, and the erroneous transmission score calculated by the first calculation process. It is characterized by processing and executing.
The adjustment program and the adjustment device according to the fourth aspect of the invention disclosed in the present application include a first reception process for receiving an e-mail from a source to a destination from the source, and an electron received by the first reception process. A hold process for holding an email in a predetermined hold time storage device, a second reception process for receiving a cancellation instruction for sending the e-mail from the sender, and a cancellation instruction within the hold time by the second reception process. If the e-mail is sent to the destination after the hold time has elapsed, and if the cancellation instruction is received within the hold time, the e-mail is not sent to the destination. If the cancellation instruction is received within the hold time, is the email an erroneously sent email from the sender based on the presence or absence of a title at the end of the person's name in the email message? Executing the first calculation process for calculating the erroneous transmission score indicating whether or not, and the adjustment process for adjusting the holding time so as to increase based on the erroneous transmission score calculated by the first calculation process. It is characterized by.
The adjustment program and the adjustment device according to the fifth aspect of the invention disclosed in the present application include a first reception process for receiving an e-mail from a source to a destination from the source, and an e-mail received by the first reception process. A hold process for holding an email in a predetermined hold time storage device, a second reception process for receiving a cancellation instruction for sending the e-mail from the sender, and a cancellation instruction within the hold time by the second reception process. If the e-mail is sent to the destination after the hold time has elapsed, and if the cancellation instruction is received within the hold time, the e-mail is not sent to the destination. If the cancellation instruction is received within the hold time, an erroneous transmission indicating whether or not the e-mail is an erroneously transmitted e-mail from the sender is based on the characteristics of the erroneous transmission of the e-mail. Based on the first calculation process for calculating the score and the characteristic of normal transmission that when the e-mail is transmitted by the transmission process, the cancellation instruction is not received and is transmitted to the destination after the holding time has elapsed. , The holding time based on the second calculation process for calculating the normal transmission score indicating whether or not the e-mail is normally transmitted, and the erroneous transmission score calculated by the first calculation process. Is adjusted so as to increase, and based on the normal transmission score calculated by the second calculation process, the adjustment process for adjusting the holding time to decrease is executed.

According to a typical embodiment of the present invention, it is possible to optimize the holding time required for canceling the transmission from the transmission of the e-mail from the source to the arrival at the destination. Issues, configurations and effects other than those described above will be clarified by the description of the following examples.

FIG. 1 is an explanatory diagram showing an example of adjusting the holding time required for canceling transmission from the transmission of an e-mail from the source to the arrival at the destination. FIG. 2 is a block diagram showing an example of a computer hardware configuration. FIG. 3 is an explanatory diagram showing an example of stored contents of the feature table. FIG. 4 is an explanatory diagram showing an example of the stored contents of the word appearance table. FIG. 5 is a block diagram showing a functional configuration example of the mail server. FIG. 6 is an explanatory diagram showing a screen example 1 of a mailer on a source terminal. FIG. 7 is an explanatory diagram showing screen example 2 of the mailer on the source terminal. FIG. 8 is an explanatory diagram showing a screen example 3 of the mailer on the source terminal. FIG. 9 is a flowchart showing an example of a procedure for adjusting the hold time by the mail server. FIG. 10 is a flowchart showing a detailed processing procedure example of the first calculation process (step S906) shown in FIG. FIG. 11 is a flowchart showing a detailed processing procedure example of the second calculation process (step S911) shown in FIG. FIG. 12 is a flowchart showing an example of a mailer processing procedure at the source terminal.

<Example of holding time adjustment>
FIG. 1 is an explanatory diagram showing an example of adjusting the holding time required for canceling transmission from the transmission of an e-mail from the source to the arrival at the destination. (A) shows the system configuration, and (B) shows the time chart.

In (A), when the first terminal 101 is the source terminal and the second terminal 104 is the destination terminal, the first terminal 101 passes through the first mail server 102, the network 110, and the second mail server 103. An e-mail is sent to the second terminal 104. The first mail server 102 holds the e-mail from the first terminal 101 for a certain period of time. Similarly, when the second terminal 104 is the source terminal and the first terminal 101 is the destination terminal, the second terminal 104 is the first via the second mail server 103, the network 110, and the first mail server 102. Send an e-mail to the terminal 101. The second mail server 103 holds the e-mail from the second terminal 104 for a certain period of time. The fixed time for holding an e-mail on the first mail server 102 and the second mail server 103 is referred to as a hold time Th. The hold time Th is a time for receiving a cancellation instruction for sending an e-mail from the source terminal from the source terminal.

In the following description, the first terminal 101 will be described as the source terminal 101, the second terminal 104 as the destination terminal 104, and the first mail server 102102 as the mail server 102 for adjusting the holding period.

In (B), the source terminal 101 transmits an e-mail to the destination terminal 104 (step S1). The mail server 102 receives the e-mail from the sender terminal 101 (step S2). When the mail server 102 receives the e-mail from the sender terminal 101, the mail server 102 starts timing of the hold time Th (step SS3).

When the user of the sender terminal 101 wants to cancel the transmission of the sent e-mail after the fact, he / she sends a cancellation instruction to the mail server 102 (step S4). The mail server 102 receives a cancellation instruction from the source terminal 101 within the hold time Th (step S5). The mail server 102 stores the canceled e-mail in the database (DB) 120, and executes the analysis of the characteristics related to erroneous transmission together with the analysis result of the e-mail group canceled before this by using the Bayesian filter. (Step S6). The mail server 102 adjusts so that the hold time Th increases according to the analysis result (step S7).

As a result, as the number of e-mails whose transmission is canceled after the fact increases, the holding time Th increases, so that the user of the sender terminal 101 can easily cancel the transmission of the e-mail after the fact. The mail server 102 may discard the e-mail instructed to cancel.

If the mail server 102 does not receive the cancellation instruction from the sender terminal 101 within the holding period, the mail server 102 transmits the e-mail to the destination (step S8). The mail server 102 stores the e-mail sent to the destination in the DB 120, and uses the Bayesian filter to analyze the characteristics related to normal transmission together with the analysis result of the e-mail group sent to the destination without being canceled before this. (Step S9). The mail server 102 adjusts so that the hold time Th decreases according to the analysis result (step S10).

As a result, as the number of e-mails whose transmission is not canceled after the fact increases, the hold time Th decreases, so that the delay in the arrival of the e-mails can be suppressed.

<Computer hardware configuration example>
FIG. 2 is a block diagram showing an example of a computer hardware configuration. The computer is, for example, the first terminal 101, the first mail server 102102, the second mail server 102103, and the second terminal 104 shown in FIG. The computer 200 has a processor 201, a storage device 202, an input device 203, an output device 204, and a communication interface (communication IF205). The processor 201, the storage device 202, the input device 203, the output device 204, and the communication IF 205 are connected by the bus 206. The processor 201 controls the computer 200. The storage device 202 serves as a work area for the processor 201. Further, the storage device 202 is a non-temporary or temporary recording medium for storing various programs and data. Examples of the storage device 202 include a ROM (Read Only Memory), a RAM (Random Access Memory), an HDD (Hard Disk Drive), and a flash memory. The input device 203 inputs data. The input device 203 includes, for example, a keyboard, a mouse, a touch panel, a numeric keypad, and a scanner. The output device 204 outputs data. The output device 204 includes, for example, a display and a printer. The communication IF 205 connects to the network 110 and transmits / receives data.

<Various tables>
Various tables included in the DB shown in FIG. 1 will be described. In the following description of the table, the value of the AA field bbb (AA is the field name and bbb is the code) may be expressed as AAbbb. For example, the value of the mail type field 301301 is expressed as the mail type 301.

FIG. 3 is an explanatory diagram showing an example of stored contents of the feature table. The feature table 300 is a table that defines the features of the e-mail received by the mail server 102. The feature table 300 has a mail type field 301, a count field 302, and an average creation time field 303. The mail type field 301 is an area for storing the mail type. The mail type 301 includes a cancellation mail and a normal mail. The cancellation mail is an e-mail instructed to cancel from the sender terminal 101. The normal mail is an e-mail normally transmitted from the source terminal 101 to the destination due to the elapse of the holding period.

The number field 302 is a storage area for storing the number of e-mails for each mail type 301. In Nc, the mail type 301 is the number of canceled mails, and in Ns, the mail type 301 is the number of normal mails. The values Nc and Ns of the number field 302 are counted up each time an e-mail of the corresponding mail type 301 is received.

The average creation time field 303 is a storage area for storing the average creation time for each mail type 301. The average creation time 303 is an average value of the creation time when the e-mail is created on the source terminal 101. The creation time (for example, the time obtained by subtracting the creation start time from the transmission time at the sender terminal 101) is embedded in the header of the e-mail, and the mail server 102 extracts the creation time from the header. In Tcc, the mail type 301 is the average creation time 303 of the canceled mail, and in Tcs, the mail type 301 is the average creation time 303 of the normal mail. The values Tcc and Tcs of the average creation time field 303 are updated each time an email of the corresponding email type 301 is received. In this embodiment, the average creation time 303 is adopted, but statistical values such as the median value, the maximum value, and the minimum value of the creation time may be used.

FIG. 4 is an explanatory diagram showing an example of the stored contents of the word appearance table. The word appearance table 400 has a word field 401, a canceled mail number field 402 that has appeared, and a normal mail number field 403 that has appeared. The word field 401 is a storage area for storing words appearing in the e-mail. Each time a new word appears, it is added to the word field 401. The number of canceled emails field 402 that appears is a storage area that stores the number of canceled emails in which the word 401 appears. The number of normal mails field 403 that appears is a storage area that stores the number of normal mails in which the word 401 appears. In FIG. 4, for example, for the word wi, the number of canceled emails in which the word wi appears is nci, and the number of normal emails in which the word wi appears is nsi.

The feature table 300 and the word appearance table 400 are information stored in the storage device 202 shown in FIG.

<Example of functional configuration of mail server 102>
FIG. 5 is a block diagram showing a functional configuration example of the mail server 102. The mail server 102 is an adjustment device having a feature table 300, a word appearance table 400, a reception unit 501, a holding unit 502, a transmission unit 503, a calculation unit 504, and an adjustment unit 505. The receiving unit 501, the holding unit 502, the transmitting unit 503, the adjusting unit 505, and the calculating unit 504 specifically, for example, by causing the processor 201 to execute a program stored in the storage device 202 shown in FIG. , Or a function realized by the communication IF205.

The receiving unit 501 causes the processor 201 to execute the first receiving process and the second receiving process. The first reception process is a process of receiving an e-mail from the source terminal 101 to the destination terminal 104 from the source terminal 101. The second reception process is a process of receiving an e-mail transmission cancellation instruction from the source terminal 101.

The hold unit 502 causes the processor 201 to execute the hold process. The hold process holds the e-mail received by the first reception process in the storage device 202 for a predetermined hold time Th.

The transmission unit 503 causes the processor 201 to execute the transmission process. In the transmission process, if the cancellation instruction is not received within the hold time Th by the second reception process, an e-mail is sent to the destination after the hold time Th has elapsed, and if the cancel instruction is received within the hold time Th, the transmission process is electronic. This is a process that does not send an email to the recipient.

The calculation unit 504 causes the processor 201 to execute the first calculation process and the second calculation process. In the first calculation process, if the cancellation instruction is received within the hold time Th, whether or not the e-mail is an erroneously transmitted e-mail sent by the sender based on the characteristics related to the erroneous transmission of the e-mail. This is a process of calculating an erroneous transmission score indicating. In the second calculation process, when an e-mail is sent by the transmission process, a normal transmission score indicating whether or not the e-mail is a normal e-mail sent normally is calculated based on the characteristics related to the normal transmission of the e-mail. It is a process to do.

In the first calculation process and the second calculation process, the processor 201 decomposes the character string, which is a message in the e-mail, into words by morphological analysis as a preprocessing. Then, for each of the decomposed word groups, if the e-mail is a cancellation e-mail, the processor 201 counts up the value nci of the number of canceled e-mails field 402 that appears by 1 when the e-mail already exists in the word 401. If the e-mail is a normal mail, the value nsi of the number of normal mails field 403 that appears is incremented by one. If it is a new word, the processor 201 adds the new word wi to the word field 401, sets the value nci of the number of canceled mails field 402 that appears to 1, and the e-mail is a normal mail. For example, the value nsi of the number of normal mails field 403 that appears is set to 1.

Further, in the first calculation process and the second calculation process, the processor 201 updates the feature table 300 as a pre-process. For example, if the e-mail is a cancellation e-mail, the value Nc of the number field 302 is incremented by 1, and if the e-mail is a normal e-mail, the value Ns of the number field 302 is incremented by 1.

Further, in the first calculation process and the second calculation process, as post-processing, the processor 201 extracts the creation time from the header of the e-mail if the e-mail is a cancellation mail, and the extracted creation time and the present The average creation time Tcc is updated by using the average creation time Tcc of the above and the value obtained by adding 1 to the number Nc. Similarly, as post-processing, if the e-mail is a normal e-mail, the processor 201 extracts the creation time from the header of the e-mail, and the extracted creation time, the current average creation time Tcs, and the number Ns are 1. The average creation time Tcs is updated using the added value and.

Next, an example of calculating the erroneous transmission score by the first calculation process will be described. As described above, in the first calculation process, the processor 201 has an erroneous transmission score indicating whether or not the e-mail is an erroneously transmitted email from the sender, based on the characteristics relating to the erroneous transmission of the email. Is calculated. Here, the features related to erroneous transmission will be specifically described.

In the first calculation process, the processor 201 is based on the number of e-mail groups whose transmissions have been canceled in the past by the transmission process and the number of e-mail groups including words contained in the e-mail. , Calculate the erroneous transmission score. The number of e-mails whose transmission has been canceled in the past by the transmission process is the number Nc of the feature table 300. Among the number of canceled e-mails, the number including the word wi included in the e-mail canceled this time is the number of canceled e-mails nci that have appeared.

The appearance score EASwi of a certain word wi is expressed by the following equation (1).

The appearance score EASwi is the probability that the word wi is included in the erroneously sent mail. Usually, the character strings that make up an e-mail message are made up of a plurality of words. Here, the plurality of words are, for example, words w1 to wm (m is an integer of 2 or more). By expanding the above equation (1) into a plurality of words, the erroneous transmission score ES is calculated as shown in the following equation (2).

Further, in the first calculation process, the processor 201 may calculate the erroneous transmission score ES based on the length of the e-mail creation time as a feature regarding the erroneous transmission. In this case, the initial value of the erroneous transmission score ES is set in advance. Then, the processor 201 updates the erroneous transmission score ES by the difference between the e-mail creation time and the average creation time Tcc. Assuming that the e-mail creation time is TC, if TC ≧ Tcc, it means that it takes time to compose the e-mail. In other words, since the user of the source terminal 101 is carefully composing the e-mail, the current erroneous transmission score ES is set to a lower value.

On the other hand, if TC <Tcc, it means that it does not take much time to compose the e-mail. In other words, the user of the source terminal 101 tends to create a message including an error or an erroneous expression, so that the current erroneous transmission score ES is set to a higher value.

The value ΔES to be added to the current erroneous transmission score ES is set according to, for example, the magnitude of the difference (TC-Tcc). That is, if the difference (TC-Tcc) is a positive value, the possibility of erroneous transmission mail is low, so that the processor 201 subtracts the value ΔES corresponding to the difference from the current erroneous transmission score ES. On the other hand, if the difference (TC-Tcc) is a negative value, there is a high possibility of erroneous transmission mail. Therefore, the processor 201 adds the value ΔES corresponding to the difference to the current erroneous transmission score ES.

Further, the erroneous transmission score ES calculated by the equation (2) may be multiplied by a coefficient K1 according to the difference (TC-Tcc). For example, if the difference (TC-Tcc) is a positive value, the possibility of erroneously sent mail is low, so the processor 201 sets the coefficient K1 (0 <K1 <1) according to the magnitude of the difference. .. On the other hand, if the difference (TC-Tcc) is a negative value, there is a high possibility of erroneously sent mail, so the processor 201 sets the coefficient K1 (K1 ≧ 1) according to the magnitude of the difference. Then, the processor 201 updates the erroneous transmission score ES by multiplying the erroneous transmission score ES calculated by the equation (2) by the coefficient K1.

As described above, in the first calculation process, the processor 201 may calculate the erroneous transmission score ES based on the length of the e-mail creation time, and the erroneous transmission score ES calculated by the equation (2) is used in the e-mail. It may be corrected by the length of the creation time.

Further, in the first calculation process, the processor 201 may calculate the erroneous transmission score ES based on the presence or absence in the message of the e-mail having the name described in the destination header of the e-mail as a feature regarding the erroneous transmission. Good. The name given in the destination header instead of the email address is usually given in the message as well. Therefore, if the name in the email destination header does not exist in the email message, either the recipient or the content of the message may be incorrect.

In this case, the initial value of the erroneous transmission score ES is set in advance. Then, when the name is described in the destination header of the e-mail, the processor 201 sets the current erroneous transmission score ES to a lower value if the name is described in the message. On the other hand, if it is not described, the current mistransmission score ES is set to a higher value.

Further, the erroneous transmission score ES calculated by the equation (2) may be multiplied by the coefficient K2. For example, if the name of the destination header of the e-mail is described in the message, the possibility of erroneously sent e-mail is low, so the processor 201 sets the coefficient K2 (0 <K2 <1). On the other hand, if the name of the destination header of the e-mail is not described in the message, there is a high possibility of erroneously sent e-mail, so the processor 201 sets the coefficient K2 (K2 ≧ 1). Then, the processor 201 updates the erroneous transmission score ES by multiplying the erroneous transmission score ES calculated by the equation (2) by the coefficient K2.

As described above, in the first calculation process, the processor 201 may calculate the erroneous transmission score ES depending on the presence or absence of the name of the destination header, and the erroneous transmission score ES calculated by the equation (2) is used as the name of the destination header. It may be corrected by the presence or absence.

Further, in the first calculation process, the processor 201 may calculate the erroneous transmission score ES in the processor 201 based on the presence or absence of the honorific title at the end of the personal name in the e-mail message as a feature regarding the erroneous transmission. For example, if the titles such as "sama", "den", "san", "kun", and "teacher" are not described at the end of the name appearing in the message, it is possible that the titles have been forgotten.

In this case, the initial value of the erroneous transmission score ES is set in advance. Then, the processor 201 sets the current erroneous transmission score ES to a higher value when there is no title at the end of the person's name appearing in the message. On the other hand, if there is a title at the end of the person's name that appears in the message, the current mistransmission score ES is set to a lower value.

Further, the erroneous transmission score ES calculated by the equation (2) may be multiplied by the coefficient K3. For example, if there is no title at the end of the person's name appearing in the message, there is a high possibility of erroneously sent mail, so the processor 201 sets the coefficient K3 (K3 ≧ 1). On the other hand, if there is a title at the end of the person's name appearing in the message, the possibility of erroneously sent mail is low, so the processor 201 sets the coefficient K3 (0 <K3 <1). Then, the processor 201 updates the erroneous transmission score ES by multiplying the erroneous transmission score ES calculated by the equation (2) by the coefficient K3.

As described above, in the first calculation process, the processor 201 may calculate the erroneous transmission score ES based on the presence or absence of the title at the end of the person's name appearing in the message, and the erroneous transmission score ES calculated by the equation (2). May be corrected by the presence or absence of the title at the end of the person's name that appears in the message.

Further, in the first calculation process, the processor 201 may calculate the erroneous transmission score ES based on the presence / absence of the attached file and the character string related to the attached file in the e-mail message as a feature regarding the erroneous transmission. Good. The character string related to the attached file is a character string that suggests that the attached file is attached to the e-mail, such as the file name and the character string "attached". If the character string exists in the message but the attached file is not attached, there is a possibility that the attached file has been forgotten. In addition, if the attached file is attached even though the character string does not exist in the message, there is a possibility that the description of the character string is forgotten.

In this case, the initial value of the erroneous transmission score ES is set in advance. Then, the processor 201 has a character string related to the attached file in the e-mail message and the attached file is attached, or the character string related to the attached file in the e-mail message does not exist. If no attached file is attached, the current mistransmission score ES is set to a lower value. On the other hand, the processor 201 has a character string related to the attached file in the e-mail message and the attached file is not attached, or the character string related to the attached file in the e-mail message does not exist. If an attached file is attached, the current erroneous transmission score ES is set to a higher value.

Further, the erroneous transmission score ES calculated by the equation (2) may be multiplied by the coefficient K4. For example, if there is a string for the attachment in the email message and the attachment is attached, or if there is no string for the attachment in the email message and the attachment If is not attached, the possibility of erroneously sent mail is low, so the processor 201 sets the coefficient K4 (0 <K4 <1). On the other hand, if there is a string for the attachment in the email message and the attachment is not attached, or if there is no string for the attachment in the email message and the attachment If is attached, there is a high possibility of erroneously sent mail, so the processor 201 sets the coefficient K4 (K4 ≧ 1). Then, the processor 201 updates the erroneous transmission score ES by multiplying the erroneous transmission score ES calculated by the equation (2) by the coefficient K4.

As described above, in the first calculation process, the processor 201 may calculate the erroneous transmission score ES by the presence / absence of the attached file and the character string related to the attached file in the e-mail message, and the equation (2) is used. The calculated erroneous transmission score ES may be corrected by the presence or absence of the attached file and the character string related to the attached file in the e-mail message.

Next, an example of calculating the normal transmission score by the second calculation process will be described. As described above, in the second calculation process, the processor 201 determines a normal transmission score indicating whether or not the e-mail is a normal mail normally transmitted from the sender, based on the characteristics relating to the normal transmission of the e-mail. calculate. Here, the features related to normal transmission will be specifically described.

In the second calculation process, the processor 201 includes the number of e-mail groups normally (without being canceled) transmitted in the past by the transmission process, and the words included in the e-mail among the number of e-mail groups. The normal transmission score is calculated based on the number of cases. The number of e-mails sent normally (without being canceled) in the past by the transmission process is the number Ns of the feature table 300. Of the number of normally sent e-mails, the number including the word wi included in the normally sent e-mails this time is the number of normal e-mails that have appeared.

The appearance score NASwi of a certain word wi is expressed by the following equation (3).

The appearance score NASwi is the probability that the word wi is included in the normal mail. Usually, the character strings that make up an e-mail message are made up of a plurality of words. Here, the plurality of words are, for example, words w1 to wm (m is an integer of 2 or more). By expanding the above equation (3) into a plurality of words, the normal transmission score NS is calculated as shown in the following equation (4).

Further, in the first calculation process, the processor 201 may calculate the normal transmission score based on the length of the e-mail creation time as a feature relating to the normal transmission. In this case, the initial value of the normal transmission score NS is set in advance. Then, the processor 201 updates the normal transmission score NS by the difference between the e-mail creation time and the average creation time Tcc. Assuming that the e-mail creation time is TC, if TC ≧ Tcc, it means that it takes time to compose the e-mail. In other words, since the user of the source terminal 101 is carefully composing the e-mail, the current normal transmission score NS is set to a higher value.

On the other hand, if TC <Tcc, it means that it does not take much time to compose the e-mail. In other words, the user of the source terminal 101 tends to create a message including an error or an erroneous expression, so that the current normal transmission score NS is set to a higher value.

The value ΔES to be added to the current normal transmission score NS is set according to, for example, the magnitude of the difference (TC-Tcc). That is, if the difference (TC-Tcc) is a positive value, there is a high possibility of normal mail, so the processor 201 adds the value ΔES corresponding to the difference to the current normal transmission score NS. On the other hand, if the difference (TC-Tcc) is a negative value, the possibility of normal mail is low, so the processor 201 subtracts the value ΔES corresponding to the difference from the current normal transmission score NS.

Further, the normal transmission score NS calculated by the equation (4) may be multiplied by a coefficient K5 according to the difference (TC-Tcc). For example, if the difference (TC-Tcc) is a positive value, there is a high possibility of normal mail, so the processor 201 sets the coefficient K5 (K5 ≧ 1) according to the magnitude of the difference. On the other hand, if the difference (TC-Tcc) is a negative value, the possibility of normal mail is low, so the processor 201 sets the coefficient K5 (0 <K5 <1) according to the magnitude of the difference. Then, the processor 201 updates the normal transmission score NS by multiplying the normal transmission score NS calculated by the equation (4) by the coefficient K5.

As described above, in the second calculation process, the processor 201 may calculate the normal transmission score NS based on the length of the e-mail creation time, and the normal transmission score NS calculated by the equation (4) is used for the e-mail. It may be corrected by the length of the creation time.

Further, in the second calculation process, the processor 201 may calculate the normal transmission score NS based on the presence or absence in the message of the e-mail having the name described in the destination header of the e-mail as a feature of the normal transmission. Good. The name given in the destination header instead of the email address is usually given in the message as well. Therefore, if the name in the email destination header does not exist in the email message, either the recipient or the content of the message may be incorrect.

In this case, the initial value of the normal transmission score NS is set in advance. Then, when the name is described in the destination header of the e-mail, the processor 201 sets the current normal transmission score NS to a higher value if the name is described in the message. On the other hand, if it is not described, the current normal transmission score NS is set to a lower value.

Further, the normal transmission score NS calculated by the equation (4) may be multiplied by the coefficient K6. For example, if the name of the destination header of the e-mail is described in the message, there is a high possibility that the e-mail is normal, so the processor 201 sets the coefficient K6 (K6 ≧ 1). On the other hand, if the name of the destination header of the e-mail is not described in the message, the possibility of normal mail is low, so the processor 201 sets the coefficient K6 (0 <K6 <1). Then, the processor 201 updates the normal transmission score NS by multiplying the normal transmission score NS calculated by the equation (4) by the coefficient K6.

As described above, in the second calculation process, the processor 201 may calculate the normal transmission score NS based on the presence or absence of the name of the destination header, and the normal transmission score NS calculated by the equation (4) is used as the name of the destination header. It may be corrected by the presence or absence.

Further, in the second calculation process, the processor 201 may calculate the normal transmission score NS in the processor 201 based on the presence or absence of the honorific title at the end of the personal name in the e-mail message as a feature related to the normal transmission. For example, if the titles such as "sama", "den", "san", "kun", and "teacher" are not described at the end of the name appearing in the message, it is possible that the titles have been forgotten.

In this case, the initial value of the normal transmission score NS is set in advance. Then, the processor 201 sets the current normal transmission score NS to a lower value when there is no title at the end of the person's name appearing in the message. On the other hand, if there is a title at the end of the person's name appearing in the message, the current normal transmission score NS is set to a higher value.

Further, the normal transmission score NS calculated by the equation (4) may be multiplied by the coefficient K7. For example, if there is no title at the end of the person's name appearing in the message, the possibility of normal mail is low, so the processor 201 sets the coefficient K7 (0 <K7 ≦ 1). On the other hand, if there is a title at the end of the person's name appearing in the message, there is a high possibility that the mail is normal, so the processor 201 sets the coefficient K7 (K7 ≧ 1). Then, the processor 201 updates the normal transmission score NS by multiplying the normal transmission score NS calculated by the equation (6) by the coefficient K7.

As described above, in the second calculation process, the processor 201 may calculate the normal transmission score NS based on the presence or absence of the title at the end of the person's name appearing in the message, and the normal transmission score NS calculated by the equation (6). May be corrected by the presence or absence of the title at the end of the person's name that appears in the message.

Further, in the second calculation process, the processor 201 may calculate the normal transmission score NS based on the presence / absence of the attached file and the character string related to the attached file in the e-mail message as a feature related to the normal transmission. Good. The character string related to the attached file is a character string that suggests that the attached file is attached to the e-mail, such as the file name and the character string "attached". If the character string exists in the message but the attached file is not attached, there is a possibility that the attached file has been forgotten. In addition, if the attached file is attached even though the character string does not exist in the message, there is a possibility that the description of the character string is forgotten.

In this case, the initial value of the normal transmission score NS is set in advance. Then, the processor 201 has a character string related to the attached file in the e-mail message and the attached file is attached, or the character string related to the attached file in the e-mail message does not exist. If no attached file is attached, the current normal transmission score NS is set to a higher value. On the other hand, the processor 201 has a character string related to the attached file in the e-mail message and the attached file is not attached, or the character string related to the attached file in the e-mail message does not exist. If the attached file is attached, the current normal transmission score NS is set to a lower value.

Further, the normal transmission score NS calculated by the equation (4) may be multiplied by the coefficient K8. For example, if there is a string for the attachment in the email message and the attachment is attached, or if there is no string for the attachment in the email message and the attachment If is not attached, there is a high possibility that the mail is sent normally, so the processor 201 sets the coefficient K8 (K8 ≧ 1). On the other hand, if there is a string for the attachment in the email message and the attachment is not attached, or if there is no string for the attachment in the email message and the attachment If is attached, the possibility of normal mail is low, so the processor 201 sets the coefficient K8 (0 <K8 <1). Then, the processor 201 updates the normal transmission score NS by multiplying the normal transmission score NS calculated by the equation (4) by the coefficient K8.

The adjustment unit 505 causes the processor 201 to execute the first adjustment process and the second adjustment process. The first adjustment process is a process of adjusting the hold time Th so as to increase based on the erroneous transmission score ES calculated by the first calculation process. The second adjustment process is a process of adjusting the hold time Th so as to decrease based on the normal transmission score NS calculated by the second calculation process.

In the first adjustment process, the processor 201 increases the hold time Th according to the erroneous transmission score ES. For example, if the erroneous transmission score ES is a value in the range of 0% to 100%, and 0% ≤ ES <P1% (P1 is a value less than 100%), the hold time Th is maintained as it is, 0%. If ≤ES <P2% (P2 is a value of P1% or more and less than 100%), the holding time Th increases by 10%, and P1% ≤ES <P2% (P2 is a value larger than P1% and less than 100%). ), The hold time Th increases by 20%, and if P2% ≤ ES ≤ 100%, the hold time Th increases by 30%. The processor 201 is proportional to the magnitude of the erroneous transmission score ES. Adjust to increase the hold time Th.

In the first adjustment process, the processor 201 increases the hold time Th according to the erroneous transmission score ES. For example, assuming that the erroneous transmission score ES is a value in the range of 0% to 100%, if 0% ≤ ES <P1% (P1 is a value less than 100%), the hold time Th is maintained as it is, P1%. If ≤ES <P2% (P2 is greater than P1% and less than 100%), the hold time Th increases by 10%, and P2% ≤ES <P3% (P3 is greater than P2% and less than 100%). If (value), the hold time Th increases by 20%, if P3% ≤ ES ≤ 100%, the hold time Th increases by 30%, and so on, the processor 201 is proportional to the magnitude of the erroneous transmission score ES. And adjust to increase the hold time Th.

In the second adjustment process, the processor 201 reduces the hold time Th according to the normal transmission score NS. For example, assuming that the normal transmission score NS is a value in the range of 0% to 100%, if 0% ≤ NS <Q1% (Q1 is a value less than 100%), the hold time Th is maintained as it is, Q1%. If ≤NS <Q2% (Q2 is greater than Q1% and less than 100%), the hold time Th is reduced by 10%, and Q2% ≤ES <Q3% (Q3 is greater than Q2% and less than 100%). If (value), the hold time Th is reduced by 20%, if Q3% ≤ NS ≤ 100%, the hold time Th is reduced by 30%, and the processor 201 is proportional to the magnitude of the normal transmission score NS. And adjust so that the hold time Th is reduced.

In the first adjustment process and the second adjustment process, the processor 201 gives the hold time Th after adjustment to the hold unit 502. As a result, the holding unit 502 holds the e-mails received thereafter by the adjusted holding time Th. Further, in the first adjustment process and the second adjustment process, the processor 201 may transmit the adjusted hold time Th to the transmission source terminal 101. As a result, the sender terminal 101 can confirm the hold time Th for each transmitted e-mail.

<Screen example of source terminal 101>
Next, a screen example of the mailer on the source terminal 101 will be described with reference to FIGS. 6 to 8.

FIG. 6 is an explanatory diagram showing a screen example 1 of a mailer on the source terminal 101. The screen 600 has a send button. When the send button 601 is pressed, the selected e-mail is sent to the destination. Further, on the screen 600, the outbox folder 602 and its subfolders, a provisionally sent folder 621, a sent folder 622, and a creating folder 623, are displayed in a selectable manner. The provisionally transmitted e-mail is stored in the provisionally transmitted folder 621. The provisionally transmitted e-mail is an e-mail sent from the sender terminal 101 and held by the mail server 102. The sent e-mail sent to the destination is stored in the sent folder 622. The e-mail being created by the sender terminal 101 is saved in the creating folder 623.

In FIG. 6, the provisionally transmitted folder 621 is selected, and the e-mails e1, e2, ... Saved in the provisionally transmitted folder are displayed on the screen 600. In addition, the remaining hold time 630 is displayed for each e-mail. The remaining hold time 630 is the remaining time of the hold time Th due to the countdown of the hold time Th. When the remaining hold time 630 becomes 0, the e-mail is sent from the mail server 102 to the destination, and cancellation becomes impossible.

Here, when the e-mail e2 is selected and the menu screen 640 is called (for example, right-clicking the mouse), the menu screen 640 is displayed. The transmission cancel menu 641 is displayed on the menu screen 640. By selecting the transmission cancel menu 641 with the cursor C, the cancellation instruction of the e-mail e2 is sent to the mail server 102, and the e-mail e2 has been provisionally sent. It is deleted from the folder 621.

FIG. 7 is an explanatory diagram showing screen example 2 of the mailer on the source terminal 101. When the transmission cancel menu 641 is selected in FIG. 6, the e-mail e2 deleted from the provisionally transmitted folder 621 is moved to the composing folder 623.

FIG. 8 is an explanatory diagram showing a screen example 3 of the mailer on the source terminal 101. If the e-mail e2 is sent to the destination without being canceled in FIG. 6, the e-mail e2 is moved to the sent folder 622.

<Example of adjustment processing procedure>
FIG. 9 is a flowchart showing an example of a procedure for adjusting the hold time Th by the mail server 102. The mail server 102 listens for an e-mail from the sender terminal 101 (step S901: No). When the mail server 102 receives the e-mail (step S901: Yes), the mail server 102 holds the e-mail and starts timing the hold time Th (step S902). Then, the mail server 102 determines whether or not the hold time Th has elapsed (step S903). When the hold time Th has not elapsed (step S903: No), the mail server 102 determines whether or not a cancellation instruction has been received from the sender terminal 101 (step S904). If the cancellation instruction has not been received (step S904: No), the process returns to step S903.

When the cancellation instruction is received (step S904: Yes), the mail server 102 morphologically analyzes the message in the e-mail instructed to cancel (step S905). Then, the mail server 102 executes the first calculation process described above (step S906). A detailed processing procedure example of the first calculation process (step S906) will be described later with reference to FIG.

The mail server 102 adjusts to increase the hold time Th by using the erroneous transmission score ES calculated by the first calculation process (step S906) (step S907). After that, the mail server 102 deletes the e-mail instructed to cancel (step S908), and sends a cancellation completion notification to the sender terminal 101 (step S909). Then, the process returns to step S901.

Further, in step S903, when the hold time Th has elapsed (step S903: Yes), the mail server 102 morphologically analyzes the message in the e-mail in which the hold time Th has passed without being instructed to cancel (step S910). Then, the mail server 102 executes the above-mentioned second calculation process (step S911). A detailed processing procedure example of the second calculation process (step S911) will be described later with reference to FIG.

The mail server 102 adjusts so as to reduce the hold time Th by using the normal transmission score NS calculated by the second calculation process (step S911) (step S912). After that, the mail server 102 sends an e-mail whose hold time Th has elapsed without being instructed to cancel to the destination terminal 104 (step S913), and sends a transmission completion notification to the sender terminal 101 (step S914). Then, the process returns to step S901.

FIG. 10 is a flowchart showing a detailed processing procedure example of the first calculation process (step S906) shown in FIG. In the first calculation process (step S906), the mail server 102 is updated by adding 1 to the number of canceled mails Nc (step S1001). The mail server 102 updates by adding 1 to the number of occurrences of the word wi in the e-mail instructed to cancel, that is, the number of occurrences of canceled emails nci (step S1002). The mail server 102 calculates the appearance score EASwi for each word wi in the e-mail instructed to cancel by the above formula (1) (step S1003).

The mail server 102 uses the appearance score EASwi of each word wi calculated in step S1003 to calculate the erroneous transmission score ES of the e-mail instructed to cancel by the above formula (2) (step S1004).

In addition, the mail server 102 extracts a feature related to erroneous transmission other than the appearance score EASwi for the e-mail instructed to cancel (step S1005). Then, the mail server 102 corrects the erroneous transmission score ES according to the extracted features (step S1006).

FIG. 11 is a flowchart showing a detailed processing procedure example of the second calculation process (step S911) shown in FIG. In the second calculation process (step S911), the mail server 102 is updated by adding 1 to the number of normal mails Ns (step S1101). The mail server 102 is updated by adding 1 to the number of occurrences of the word wi in the normal mail, that is, the number of normal mails that have appeared nsi (step S1102). The mail server 102 calculates the appearance score NASwi for each word wi in the normal mail by the above formula (3) (step S1103).

The mail server 102 calculates the normal transmission score NS of the normal mail by the above formula (4) using the appearance score NASwi of each word wi calculated in step S1103 (step S1104).

In addition, the mail server 102 extracts features related to normal transmission other than the appearance score NASwi for normal mail (step S1105). Then, the mail server 102 corrects the normal transmission score NS according to the extracted features (step S1106).

FIG. 12 is a flowchart showing an example of a mailer processing procedure in the source terminal 101. It is assumed that the sender terminal 101 always receives the latest hold time Th from the mail server 102. When the sender terminal 101 listens for a transmission instruction for the e-mail to be transmitted (step S1201: No) and receives a transmission instruction (step S1201: Yes), the sender terminal 101 transmits the e-mail. The status is set to provisionally transmitted (step S1202). The e-mail sent in step S1202 is referred to as a "temporary e-mail".

The sender terminal 101 starts a countdown of the hold time Th of the provisionally sent mail and displays it on the mailer (step S1203). The source terminal 101 determines whether or not the hold time Th has elapsed (whether or not the remaining time is 0) (step S1204). When the hold time Th has not elapsed (step S1204: No), the source terminal 101 determines whether or not a cancellation instruction has been given by the user (step S1205). If there is no cancellation instruction (step S1205: No), the process returns to step S1204. On the other hand, when there is a cancel instruction (step S1205: Yes), the sender terminal 101 transmits the cancel instruction to the mail server 102 (step S1206). Then, the sender terminal 101 resets the hold time Th and changes the status of the provisionally sent mail during creation (step S1207). Then, the process returns to step S1201.

In step S1204, when the hold time Th has elapsed (step S1204: Yes), the provisionally sent mail held on the mail server 102 is sent to the destination, and the user cannot give a cancel instruction. Therefore, the sender terminal 101 resets the hold time Th and changes the status of the provisionally sent mail to sent (step S1208). Then, the process returns to step S1201.

As described above, according to the present embodiment, it is possible to easily cancel the e-mail transmitted by the user of the sender terminal 101 by increasing the hold time Th due to the feature related to the erroneous transmission of the e-mail. Therefore, it is possible to suppress the transmission of erroneous e-mails after the fact. Further, for the source terminal 101 having a low possibility of erroneous transmission, the holding time Th is shortened, so that it is possible to suppress the transmission delay of the e-mail while leaving the possibility of canceling the transmission.

It should be noted that the present invention is not limited to the above-described examples, but includes various modifications and equivalent configurations within the scope of the attached claims. For example, the above-described examples have been described in detail in order to explain the present invention in an easy-to-understand manner, and the present invention is not necessarily limited to those having all the described configurations. In addition, a part of the configuration of one embodiment may be replaced with the configuration of another embodiment. In addition, the configuration of another embodiment may be added to the configuration of one embodiment. In addition, other configurations may be added, deleted, or replaced with respect to a part of the configurations of each embodiment.

Further, each of the above-described configurations, functions, processing units, processing means, etc. may be realized by hardware by designing a part or all of them by, for example, an integrated circuit, and the processor 201 performs each function. It may be realized by software by interpreting and executing the program to be realized.

Information such as programs, tables, and files that realize each function is recorded in a storage device such as a memory, a hard disk, an SSD (Solid State Drive), or an IC (Integrated Circuit) card, an SD card, or a DVD (Digital Versaille Disc). It can be stored in a medium.

In addition, the control lines and information lines indicate those that are considered necessary for explanation, and do not necessarily indicate all the control lines and information lines necessary for implementation. In practice, it can be considered that almost all configurations are interconnected.

Feature table 300
Word appearance table 400
Receiver 501
Holding part 502
Transmitter 503
Calculation unit 504
Adjustment unit 505

Claims (9)

The first reception process of receiving an e-mail from the source to the destination from the source, and
A hold process for holding an e-mail received by the first reception process in a predetermined hold time storage device, and a hold process.
A second reception process for receiving a cancellation instruction for sending the e-mail from the sender, and
When the cancellation instruction is not received within the hold time by the second reception process, the e-mail is sent to the destination after the hold time elapses, and the cancel instruction is received within the hold time. A transmission process that does not send the e-mail to the destination, and
When the cancellation instruction is received within the hold time, the number of e-mail groups whose transmission has been canceled in the past by the transmission process and the words included in the e-mail among the number of e-mail groups are displayed. The first calculation process for calculating an erroneous transmission score indicating whether or not the e-mail is an erroneously transmitted e-mail sent by the sender based on the number of cases to be included .
Based on the erroneous transmission score calculated by the first calculation process, the adjustment process for adjusting the holding time to increase, and the adjustment process.
A tuning program characterized by having a processor execute. The first reception process of receiving an e-mail from the source to the destination from the source, and
A hold process for holding an e-mail received by the first reception process in a predetermined hold time storage device, and a hold process.
A second reception process for receiving a cancellation instruction for sending the e-mail from the sender, and
When the cancellation instruction is not received within the hold time by the second reception process, the e-mail is sent to the destination after the hold time elapses, and the cancel instruction is received within the hold time. A transmission process that does not send the e-mail to the destination, and
When the cancellation instruction is received within the hold time, it indicates whether or not the e-mail is an erroneously transmitted e-mail sent from the sender based on the length of the creation time of the e-mail. The first calculation process to calculate the erroneous transmission score and
Based on the erroneous transmission score calculated by the first calculation process, the adjustment process for adjusting the holding time to increase, and the adjustment process.
A tuning program characterized by having a processor execute. The first reception process of receiving an e-mail from the source to the destination from the source, and
A hold process for holding an e-mail received by the first reception process in a predetermined hold time storage device, and a hold process.
A second reception process for receiving a cancellation instruction for sending the e-mail from the sender, and
When the cancellation instruction is not received within the hold time by the second reception process, the e-mail is sent to the destination after the hold time elapses, and the cancel instruction is received within the hold time. A transmission process that does not send the e-mail to the destination, and
If the cancellation instruction is received within the hold time, the email is erroneously transmitted from the sender based on the presence or absence in the message of the email with the name described in the destination header of the email. The first calculation process to calculate the erroneous transmission score indicating whether or not the email was erroneously transmitted, and
Based on the erroneous transmission score calculated by the first calculation process, the adjustment process for adjusting the holding time to increase, and the adjustment process.
A tuning program characterized by having a processor execute. The first reception process of receiving an e-mail from the source to the destination from the source, and
A hold process for holding an e-mail received by the first reception process in a predetermined hold time storage device, and a hold process.
A second reception process for receiving a cancellation instruction for sending the e-mail from the sender, and
When the cancellation instruction is not received within the hold time by the second reception process, the e-mail is sent to the destination after the hold time elapses, and the cancel instruction is received within the hold time. A transmission process that does not send the e-mail to the destination, and
When the cancellation instruction is received within the hold time, the e-mail is an erroneously transmitted e-mail sent from the sender based on the presence or absence of a title at the end of the person's name in the message of the e-mail. The first calculation process to calculate the erroneous transmission score indicating whether or not,
Based on the erroneous transmission score calculated by the first calculation process, the adjustment process for adjusting the holding time to increase, and the adjustment process.
A tuning program characterized by having a processor execute. The first reception process of receiving an e-mail from the source to the destination from the source, and
A hold process for holding an e-mail received by the first reception process in a predetermined hold time storage device, and a hold process.
A second reception process for receiving a cancellation instruction for sending the e-mail from the sender, and
When the cancellation instruction is not received within the hold time by the second reception process, the e-mail is sent to the destination after the hold time elapses, and the cancel instruction is received within the hold time. A transmission process that does not send the e-mail to the destination, and
If the cancellation instruction is received within the hold time, an error indicating whether or not the e-mail is an erroneously transmitted e-mail sent from the sender based on the characteristics relating to the erroneous transmission of the e-mail. The first calculation process to calculate the transmission score and
When the e-mail is transmitted by the transmission process, the e-mail is normally transmitted based on the characteristic of normal transmission that the cancellation instruction is not received and the e-mail is transmitted to the destination after the holding time has elapsed. The second calculation process that calculates the normal transmission score indicating whether or not the mail is normal, and
The hold time is adjusted to increase based on the erroneous transmission score calculated by the first calculation process, and the hold time is reduced based on the normal transmission score calculated by the second calculation process. Adjustment process to adjust to
A tuning program characterized by having a processor execute. The adjustment program according to claim 5.
In the second calculation process, when the e-mail is transmitted by the transmission process, the e-mail includes the number of e-mail groups transmitted in the past by the transmission process and the number of e-mail groups. An adjustment program characterized by having the processor calculate a normal transmission score indicating whether or not the e-mail is a normal e-mail transmitted normally, based on the number of cases including the word. A coordinator having a processor that executes a program, a storage device that stores the program, and a communication interface that transmits and receives data.
The processor
The first reception process of receiving an e-mail from the source to the destination from the source through the communication interface, and
A hold process for holding an e-mail received by the first reception process in a predetermined hold time storage device, and a hold process.
The second reception process of receiving the cancellation instruction of the transmission of the e-mail from the sender on the communication interface, and
When the cancellation instruction is not received within the hold time by the second reception process, the e-mail is transmitted from the communication interface to the destination after the hold time elapses, and the cancel instruction is received within the hold time. If so, a transmission process that does not send the e-mail to the destination, and
When the cancellation instruction is received within the hold time, the number of e-mail groups whose transmission has been canceled in the past by the transmission process and the words included in the e-mail among the number of e-mail groups are displayed. The first calculation process for calculating an erroneous transmission score indicating whether or not the e-mail is an erroneously transmitted e-mail sent by the sender based on the number of cases to be included.
Based on the erroneous transmission score calculated by the first calculation process, the adjustment process for adjusting the holding time to increase, and the adjustment process.
A coordinator characterized by performing. A coordinator having a processor that executes a program, a storage device that stores the program, and a communication interface that transmits and receives data.
The processor
The first reception process of receiving an e-mail from the source to the destination from the source, and
A hold process for holding an e-mail received by the first reception process in a predetermined hold time storage device, and a hold process.
A second reception process for receiving a cancellation instruction for sending the e-mail from the sender, and
When the cancellation instruction is not received within the hold time by the second reception process, the e-mail is sent to the destination after the hold time elapses, and the cancel instruction is received within the hold time. A transmission process that does not send the e-mail to the destination, and
When the cancellation instruction is received within the hold time, it indicates whether or not the e-mail is an erroneously transmitted e-mail sent from the sender based on the length of the creation time of the e-mail. The first calculation process to calculate the erroneous transmission score and
Based on the erroneous transmission score calculated by the first calculation process, the adjustment process for adjusting the holding time to increase, and the adjustment process.
A coordinator characterized by performing. A coordinator having a processor that executes a program, a storage device that stores the program, and a communication interface that transmits and receives data.
The processor
The first reception process of receiving an e-mail from the source to the destination from the source, and
A hold process for holding an e-mail received by the first reception process in a predetermined hold time storage device, and a hold process.
A second reception process for receiving a cancellation instruction for sending the e-mail from the sender, and
When the cancellation instruction is not received within the hold time by the second reception process, the e-mail is sent to the destination after the hold time elapses, and the cancel instruction is received within the hold time. A transmission process that does not send the e-mail to the destination, and
If the cancellation instruction is received within the hold time, the email is erroneously transmitted from the sender based on the presence or absence in the message of the email with the name described in the destination header of the email. The first calculation process to calculate the erroneous transmission score indicating whether or not the email was erroneously transmitted, and
Based on the erroneous transmission score calculated by the first calculation process, the adjustment process for adjusting the holding time to increase, and the adjustment process.
A coordinator characterized by performing.