JP2021072025A - Mail monitoring device and mail monitoring method - Google Patents

Abstract

To highly accurately prevent erroneous transmission when relaying and transferring an outgoing mail from a user terminal to a mail server.SOLUTION: A check request unit 14C transmits, to a second user terminal among transmit destinations designated in an outgoing mail belonging to the same domain as a first user terminal which is the sender of the outgoing mail, a check request mail requesting a check by the user of the second user terminal of whether or not the outgoing mail is transmittable. When it is notified from the second user terminal before a retention period expires that the outgoing mail is not transmittable, a replay processing unit 14A aborts transfer of the outgoing mail held in a storage circuit 13 to a mail server 30.SELECTED DRAWING: Figure 1

Description

The present invention relates to a mail check technique for temporarily holding an outgoing mail sent from a user in a mail monitoring device and checking the sent mail.

Conventionally, as a mail monitoring technology for preventing erroneous transmission of sent mail sent from a sender user, while a mail monitoring device connected between a user terminal and a communication network temporarily retains sent mail. In addition, Patent Document 1 proposes a so-called self-check method in which the sender user himself / herself checks the sent mail.

Specifically, the method of Patent Document 1 requires confirmation items described in the target e-mail to be checked and confirmation required items described in the e-mail sent in the past to the destination specified in the target e-mail. When there is a contradiction between these items to be confirmed by comparing with the items, the sender user of the target mail is urged to check these items to be confirmed.
As a result, the email monitoring device retains the target email for a certain period of time, so if the sender user notices an error due to a reminder from the email monitoring device, cancel the email transmission to the email monitoring device. Can be done. Also, if the sender user does not cancel within a certain period of time, the target email will be automatically sent.

Japanese Patent No. 5876181

The prior art described in Patent Document 1 described above is a so-called self-check method in which the sender user who has sent the target email rechecks the target email. However, there is a limit to the sender user who created the target e-mail to recheck the target e-mail in detail, and there is a problem that it is difficult to extract the error and prevent the erroneous transmission with high accuracy.

The present invention is for solving such a problem, and an object of the present invention is to provide a mail check technique capable of rechecking sent mail in detail when relaying sent mail from a user terminal to a mail server. It is supposed to be.

In order to achieve such an object, the mail monitoring device according to the present invention is based on a storage circuit that holds the sent mail sent from the user terminal for a certain residence period and a check result of whether or not the sent mail can be sent. A control circuit for relaying or canceling the transmission mail to the mail server is provided, and the control circuit is the first destination terminal designated by the transmission mail, which is the transmission source of the transmission mail. A check request unit that sends a check request mail for requesting a second user terminal belonging to the same domain as the user terminal of the user terminal to check whether or not the sent mail can be sent by the user of the second user terminal. If the second user terminal notifies that the sent mail cannot be sent before the residence period expires, the forwarding of the sent mail held in the storage circuit to the mail server is stopped. It is equipped with a relay processing unit.

Further, in one configuration example of the mail monitoring device according to the present invention, when the relay processing unit receives a notification of transmission permission for the transmitted mail from the second user terminal before the expiration of the residence period. , The transmitted mail held in the storage circuit is acquired and relayed to the mail server.

Further, in one configuration example of the mail monitoring device according to the present invention, when the relay processing unit does not notify the transmitted mail from the second user terminal before the expiration of the residence period. In response to the expiration of the residence period, the transmitted mail held in the storage circuit is acquired and relayed to the mail server.

Further, in one configuration example of the mail monitoring device according to the present invention, when the check request unit includes a plurality of the second user terminals in the destination terminal, the check request unit may refer to the plurality of second user terminals. The check request mail is transmitted, and the relay processing unit permits transmission of the transmitted mail from at least one of the plurality of second user terminals, the second user terminal, before the residence period expires. When the notification is given, the transmitted mail held in the storage circuit is acquired and relayed to the mail server.

Further, in one configuration example of the mail monitoring device according to the present invention, when the relay processing unit does not include the second user terminal as the destination terminal specified in the transmitted mail, the check request mail The sent mail is relayed and forwarded to the mail server without sending.

Further, in the mail monitoring method according to the present invention, the sent mail to the mail server is based on a storage circuit that holds the sent mail sent from the user terminal for a certain residence period and a check result of whether or not the sent mail can be sent. This is a mail monitoring method used in a mail monitoring device including a control circuit for relay transfer or cancellation of the transfer, wherein the control circuit is a source of the transmitted mail among the destination terminals specified by the transmitted mail. A check to send a check request mail for requesting a second user terminal belonging to the same domain as the first user terminal to check whether or not the sent mail can be sent by the user of the second user terminal. When the request step and the control circuit receive a notification from the second user terminal that the transmitted mail cannot be transmitted before the residence period expires, the transmitted mail held in the storage circuit It includes a relay processing step for canceling the transfer to the mail server.

According to the present invention, before the outgoing mail is relayed to the mail server, it is cross-checked by a third party different from the sender user who created the outgoing mail. Therefore, it is possible to avoid the omission of the check due to the assumption that occurs when the sender user himself / herself rechecks the destination and the mail body of the target mail. Therefore, when the outgoing mail is relayed and forwarded from the user terminal to the mail server, the sent mail can be rechecked in detail, and erroneous transmission can be prevented with high accuracy.

It is a block diagram which shows the structure of the mail monitoring system. It is explanatory drawing which shows the configuration example of the sent mail. It is explanatory drawing which shows the configuration example of the check request mail. It is explanatory drawing which shows the configuration example of the check result input screen. It is a sequence diagram which shows the sending mail check operation (sending permission). It is a sequence diagram which shows the sending mail check operation (sending is impossible).

Next, an embodiment of the present invention will be described with reference to the drawings.
[Email monitoring system]
First, the mail monitoring device 10 according to the present embodiment will be described with reference to FIG. FIG. 1 is a block diagram showing a configuration of a mail monitoring system.
As shown in FIG. 1, the mail monitoring device 10 is connected between n (n is an integer of 1 or more) user terminals (# 1, # 2, ..., # N) 20 and the communication network NW. This is a device for monitoring e-mails sent and received between the mail server 30 of the communication network NW and the user terminal 20.

The user terminal 20 is composed of information terminals such as a PC, a tablet, and a smartphone as a whole, and is connected to the mail monitoring device 10 via a wired or wireless communication line L2. It has a function to send and receive e-mail.
The communication network NW is composed of a data communication network such as the Internet, and is connected to a mail server 30 that stores and distributes e-mails and a partner terminal 31 that is a partner for exchanging e-mails with the user terminal 20. ..

[Principle of invention]
The principle of the present invention will be described. The method of temporarily holding the sent mail from the user terminal 20 in the mail monitoring device 10 and rechecking the destination and the mail body of the sent mail during that time is extremely effective from the viewpoint of preventing erroneous sending of the mail. Is the target. However, according to the self-check method described above, it is difficult to extract errors and prevent erroneous transmissions with high accuracy. This is because the sender user who created the sent mail rechecks the destination and the mail body of the target mail, so that there is a high possibility that a check omission occurs due to assumption.

The present invention has focused on such a drawback of rechecking by the sender user himself, and has conceived a cross-check method in which a third party other than the sender user rechecks the sent mail. Here, as a third party to recheck, the user to be checked may be specified in advance, but the user who understands the contents of the mail not only has better check efficiency but also checks with higher accuracy. be able to. Therefore, in the present invention, among the destinations included in the sent mail, the user of the user terminal belonging to the same domain as the sender user terminal is automatically selected as the user to be rechecked. Hereinafter, a specific configuration for realizing the cross-check method according to the present invention will be described.

[Email monitoring device configuration]
As shown in FIG. 1, the mail monitoring device 10 has, as main circuit configurations, a network interface circuit (hereinafter referred to as a network I / F circuit) 11, a terminal interface circuit (hereinafter referred to as a terminal I / F circuit) 12, and a storage. A circuit 13 and a control circuit 14 are provided.

[Interface circuit]
The network I / F circuit 11 is a circuit for transmitting and receiving various data such as protocol messages and mail data related to e-mail to and from the communication network NW via a wired or wireless communication line L1.
The terminal I / F circuit 12 is a circuit for transmitting and receiving various data such as protocol messages and mail data related to e-mail to and from the user terminal 20 via a wired or wireless communication line L2.

[Memory circuit]
The storage circuit 13 is a circuit composed of a storage device such as a hard disk or a semiconductor memory, and stores various processing data and a program 13P used for the mail monitoring process in the mail monitoring device 10.
The program 13P is a program that realizes various processing units for executing the mail monitoring process by cooperating with the CPU of the control circuit 14, and is an external device and a recording medium connected to the mail monitoring device 10 (both are shown in the figure). It is read from (not shown) and stored in the storage circuit 13 in advance.

The main processing data stored in the storage circuit 13 is the retained mail 13A. In the retained mail 13A, the control circuit 14 stores the original transmitted mail (original transmitted mail) transmitted from the user terminal 20 in the storage circuit 13.
FIG. 2 is an explanatory diagram showing a configuration example of the outgoing mail. As shown in FIG. 2, the sent mail is composed of various items such as a destination address, a source address, a subject, and a mail body, and data indicating the contents thereof. In this example, two addresses, "xxx@xxx.jp" and "yy2@yyy.jp", are specified as destination addresses, and "yyy1@yyy.jp" is described as the source address.

Usually, among email addresses, the addresses after the at sign "@" are called domains. The domain is an address for identifying terminals existing on the network as a group, and in the business scene, the same domain is used for the e-mail addresses of users belonging to the same company or department. In the example of FIG. 2, an e-mail address "yy2@yy.jp" having the same domain as the domain "yy.jp" of the sender address is specified as a destination, and this destination user is the same company as the sender user. You can see that it belongs to the department.

In the present invention, since the destination "yy2@yy.jp" is suitable as the request destination for rechecking the sent mail, the destination "yy2@yy.jp" is automatically selected as the request destination for rechecking the sent mail. .. In the following, the e-mail address of the user terminal # 1 is set to "yy1@yy.jp", the e-mail address of the user terminal # 2 is set to "yyy2@yy.jp", and as shown in FIG. 2, the user terminal # 1 (No. 1) A case of requesting user terminal # 2 (second user terminal) to recheck the sent mail from (1 user terminal) will be described as an example.

[Control circuit]
The control circuit 14 includes a CPU and its peripheral circuits, and realizes various processing units for executing the mail monitoring process by reading the program 13P from the storage circuit 13 and executing the program 13P.
The main processing units realized by the control circuit 14 include a relay processing unit 14A, a retention processing unit 14B, a check request unit 14C, and a check result acquisition unit 14D. These processing units are configured to exert the functions described below, but the relationship between these processing units and the functions is not limited to the following description, and specific functions can be applied to other processing units. It may be realized by.

[Relay processing unit]
The relay processing unit 14A has a function of exchanging sent mails and received mails with the mail server 30 via the communication network NW, the communication line L1, and the network I / F circuit 11, and the communication line L2 and the terminal I /. A function for exchanging sent mails and received mails with the user terminal 20 via the F circuit 12, a function for relaying the sent mails from the user terminal 20 to the mail server 30, and receiving mails from the mail server 30. It has a function of relay transfer to the user terminal 20.

Further, when the relay processing unit 14A receives a notification of transmission permission for the transmitted mail from the second user terminal, which is the check request destination, before the preset residence period expires, the relay processing unit 14A holds it in the storage circuit 13. The function of acquiring the sent mail and relaying it to the mail server 30 and the storage circuit 13 retains the sent mail when the second user terminal notifies that the sent mail cannot be sent before the residence period expires. If there is no function to stop sending the sent mail to the mail server 30, and if the second user terminal does not notify the outgoing mail whether or not it can be sent before the residence period expires, the retention period expires. Therefore, it has a function of acquiring the transmitted mail held by the storage circuit 13 and relay-transferring it to the mail server 30.

Further, the relay processing unit 14A stores the storage circuit when the transmission permission for the transmitted mail is notified from at least one of the second user terminals among the plurality of second user terminals before the residence period expires. A function to acquire the sent mail held in 13 and relay it to the mail server 30 and send a check request mail when the second user terminal is not included as the destination terminal specified in the sent mail. It has a function of relay-forwarding the sent mail to the mail server 30 without using it. As a specific example of the residence period, about 10 minutes to 1 hour can be considered, but the time length of these periods is not limited to this, and an arbitrary time length according to the application environment of the mail monitoring device 10 can be used. You can use it.

[Stay processing unit]
The retention processing unit 14B has a function of storing the transmitted mail from the user terminal 20 received by the relay processing unit 14A in the storage circuit 13 as the retention mail 13A, and a function of measuring the elapsed time from the start of storage. ..

[Check request department]
The check request unit 14C is a second destination terminal that belongs to the same domain as the first user terminal that is the source of the transmitted mail among the destination terminals specified by the sent mail from the user terminal 20 received by the relay processing unit 14A. A function to select a user terminal and a function to create a check request mail for requesting a check of whether or not the sent mail by the user of the second user terminal can be sent, and send the check request mail from the relay processing unit 14A to the mail server 30. Have.

FIG. 3 is an explanatory diagram showing a configuration example of the check request email. As shown in FIG. 3, the check request email is composed of various items such as a destination address, a sender address, a subject, and an email body, and data indicating the contents, as in the sent email of FIG. It is created based on the original sent mail to be checked.

Of the check request emails, only email addresses that have the same domain as the sender address are listed as the destination address, and other email addresses have been deleted. In the example of FIG. 3, of the original destination addresses "xxx@xxx.jp" and "yy2@yyy.jp", only "yy2@yyy.jp" is described as the destination address of the check request email. Therefore, "xxx@xxx.jp" having a different domain has been deleted. The sender address of the check request email is "yy1@yy.jp" which is the same as the original sender email.

On the other hand, the subject of the check request email clearly states that the email is a check request email. In addition, the body of the check request email describes the content of the check request and the body of the original sent email. At this time, regarding the content of the check request, the request text "This is a mail monitoring device. There was a request to send the original mail" Project X ", so please check the address and body of this mail." And, as a check target, the destination address "xxx@xxx.jp" of an outsider having a different domain is specified.

In addition, in the body of the check request email, as an explanation about the notification of the check result, "The original email is currently staying. After checking, please let us know whether you are allowed to send or not to send on the next input screen." A link to the check result input screen is placed.

[Check result acquisition section]
The check result acquisition unit 14D is based on a web interface using a protocol such as HTTP, and is set in advance according to the operation of the link in the check request mail on the second user terminal that is the check request destination. A function to deliver the input screen to the second user terminal, a function to acquire a check result, that is, a notification of whether or not transmission is possible from the second user terminal according to an operation on the check result input screen, and an acquired transmission permission or transmission. It has a function of notifying the relay processing unit 14A of the inability.

FIG. 4 is an explanatory diagram showing a configuration example of the check result input screen. As shown in FIG. 4, on the check result input screen, a check button for selecting transmission permission and transmission non-transmission and a confirmation button for confirming the selection contents are arranged. When the user of the second user terminal selects either transmission permission or transmission prohibition and presses the confirm button, the check result, that is, transmission permission or transmission is permitted from the second user terminal to the check result acquisition unit 14D. You will be notified that you cannot send.

[Operation of the present embodiment]
Next, a mail monitoring method in the mail monitoring device 10 according to the present embodiment will be described with reference to FIGS. 5 and 6. FIG. 5 is a sequence diagram showing a sent mail check operation (sending permission). FIG. 6 is a sequence diagram showing a sent mail check operation (sending not possible).
Here, a case where the user terminal # 2 is requested to check the sent mail from the user terminal # 1 based on the sent mail shown in FIG. 2 will be described as an example.

[For permission to send]
First, with reference to FIG. 5, the outgoing mail check operation in the case of transmission permission will be described.
When the sender user creates a sent mail (step 100) and performs a sending operation on the user terminal # 1 (step 101), the user terminal # 1 is requested to send a mail related to the sent mail (step 100). 102).

The relay processing unit 14A of the mail monitoring device 10 receives the sent mail in response to the mail sending request from the user terminal # 1, instructs the retention processing unit 14B to save the sent mail, and requests the check request unit 14C to check. To instruct. In response to this instruction, the retention processing unit 14B stores the received transmitted mail as the retention mail 13A in the storage circuit 13, and starts timing the retention period (step 103).

At this time, the relay processing unit 14A refers to the destination of the sent mail, confirms whether the destination and the domain are the same, and if it is not included, the mail check cannot be requested. Therefore, the sent mail may be relayed and forwarded to the mail server 30 without saving the sent mail. Further, regarding the necessity of saving (retaining) the sent mail, not only the presence or absence of the request destination by the domain but also other judgment conditions may be added. Other judgment conditions include, for example, when the destination of the outgoing email includes a preset email address, when the outgoing email has an attachment, and when the outgoing email has an attachment, the keywords preset in the email body. If is included, a check request may be made.

Further, the check request unit 14C selects a destination having the same source and domain from the transmission mail in response to the instruction from the relay processing unit 14A, and generates a check request mail with the destination as the new destination. (Step 104). The relay processing unit 14A transmits the generated check request mail to the mail server 30 (step 105). At this time, in the case of the sent mail of FIG. 2, the user terminal # 2 having the same domain as the sender user terminal # 1 is selected as a new destination, that is, the request destination, and the check request mail shown in FIG. 4 described above is displayed. It will be generated and sent.

Subsequently, the relay processing unit 14A receives the check request mail from the mail server 30 (step 106), and relays and forwards the check request mail to the user terminal # 2 based on the destination address of the check request mail (step 107). ).

The user terminal # 2 receives the check request mail delivered from the mail monitoring device 10 and displays it on the terminal screen (step 108). The user of the user terminal # 2 checks the destination (outsider) and the content of the mail body regarding the original sent mail in response to the check request mail.
After that, when the user performs an input screen request operation (step 110), the input screen request is transmitted from the user terminal # 2 to the mail monitoring device 10 (step 111).

The check result acquisition unit 14D of the mail monitoring device 10 delivers the check result input screen shown in FIG. 5 to the user terminal # 2 in response to the input screen request from the user terminal # 2 (step 112). As a result, the check result input screen is displayed on the terminal screen of the user terminal # 2 (step 113).
Here, when the user inputs the transmission permission (step 120), the user terminal # 2 notifies the mail monitoring device 10 of the transmission permission (step 121).

The check result acquisition unit 14D confirms that the transmission permission check result for the transmitted mail is the transmission permission in response to the notification of the transmission permission from the user terminal # 2 (step 122). The relay processing unit 14A acquires the original transmitted mail from the retained mail 13A of the storage circuit 13 (step 123) and relays and forwards it to the mail server 30 (step 124) in response to the confirmation of the transmission permission.

As a result, the remote terminal 31 receives the checked outgoing mail from the mail server 30 (step 125).
Further, the relay processing unit 14A receives the checked sent mail from the mail server 30 (step 126), and relays and forwards the checked sent mail to the user terminal # 2 based on the destination address of the sent mail (step 126). Step 127).

[If transmission is not possible]
Next, with reference to FIG. 6, the outgoing mail check operation in the case where transmission is impossible will be described.
In step 113 of FIG. 5, when the user of the user terminal # 2 inputs the transmission impossibility while the check result input screen is displayed on the terminal screen of the user terminal # 2 (step 130), the user terminal # 2 starts from the user terminal # 2. The mail monitoring device 10 is notified that transmission is not possible (step 131).

The check result acquisition unit 14D of the mail monitoring device 10 confirms that the sendability check result for the sent mail is not transmitable in response to the notification from the user terminal # 2 that the send is not possible (step 132). The relay processing unit 14A discards the retained mail 13A of the storage circuit 13 in response to the confirmation that transmission is not possible (step 133), and the transmission is not possible for the source user terminal # 1 by checking at the user terminal # 2. Therefore, it is notified that the transfer has been canceled (step S134). As a result, erroneous transmission of e-mail is prevented.

In the examples of FIGS. 5 and 6, the case where the user terminal # 2 notifies whether or not transmission is possible before the expiration of the residence period has been described as an example. If there is no notification from the user terminal # 2 whether or not transmission is possible before the expiration of the residence period, the relay processing unit 14A sends the storage circuit 13 in response to the confirmation of the expiration of the residence period by the retention processing unit 14B. The retained mail 13A may be acquired as a transmission mail and relayed to the mail server 30.

Further, when the destination terminal of the sent mail includes a plurality of second user terminals capable of requesting a check, the check request unit 14C transmits the plurality of second user terminals in step 104 of FIG. All you have to do is generate the check request email. As a result, the check request mail is sent to each of the plurality of second user terminals.
At this time, the check result is notified from the plurality of second user terminals, but before the residence period expires, at least one of the plurality of second user terminals is the second user terminal. When the transmission permission is notified to the transmitted mail, the relay processing unit 14A may acquire the retained mail 13A of the storage circuit 13 as the transmitted mail and relay the mail to the mail server 30.

[Effect of this embodiment]
As described above, in the present embodiment, in the control circuit 14, the check request unit 14C belongs to the same domain as the first user terminal that is the source of the sent mail among the destination terminals specified by the sent mail. A check request mail for requesting a check of whether or not the sent mail sent by the user of the second user terminal can be sent is sent to the second user terminal, and the relay processing unit 14A sends the check request mail before the residence period expires. When the second user terminal notifies that the sent mail cannot be sent, the forwarding of the sent mail held by the storage circuit 13 to the mail server 30 is stopped.

Further, when the relay processing unit 14A receives a notification of transmission permission for the transmitted mail from the second user terminal before the residence period expires, the relay processing unit 14A acquires the transmitted mail held in the storage circuit 13 and mails. It is designed to be relayed to the server 30.

As a result, before the sent mail is relayed to the mail server 30, it is cross-checked by a third party different from the sender user who created the sent mail. Therefore, it is possible to avoid the omission of the check due to the assumption that occurs when the sender user himself / herself rechecks the destination and the mail body of the target mail. Therefore, when the transmitted mail is relayed and forwarded from the user terminal 20 to the mail server 30, the transmitted mail can be cross-checked, and erroneous transmission can be prevented with high accuracy.

Further, in the present embodiment, if there is no notification from the second user terminal of whether or not to send the transmitted mail before the expiration of the residence period, the relay processing unit 14A responds to the expiration of the residence period by the storage circuit. The sent mail held by 13 may be acquired and relayed to the mail server 30.
As a result, if the outgoing mail is not checked smoothly, the outgoing mail is automatically relayed and forwarded to the mail server 30. Therefore, it is possible to avoid a situation in which the sent mail is not sent because there is no notification of whether or not the sending is possible.

Further, in the present embodiment, when the destination terminal includes a plurality of second user terminals, the check request unit 14C sends a check request mail to these plurality of second user terminals, and the residence period If at least one of the second user terminals of the plurality of second user terminals notifies the transmission permission for the transmitted mail before the expiration date, the relay processing unit 14A holds the e-mail in the storage circuit 13. The sent mail may be acquired and relayed to the mail server 30.
As a result, the transmitted mail can be smoothly relayed and forwarded to the mail server 30 without waiting for the transmission permission notification from the plurality of second user terminals.

Further, in the present embodiment, when the second user terminal is not included as the destination terminal specified in the sent mail, the relay processing unit 14A does not send the check request mail, but sends the sent mail to the mail server. It may be relay-transferred to 30.
As a result, the transmitted mail can be smoothly relayed and forwarded to the mail server 30.

[Extension of Embodiment]
Although the present invention has been described above with reference to the embodiments, the present invention is not limited to the above embodiments. Various changes that can be understood by those skilled in the art can be made to the structure and details of the present invention within the scope of the present invention. In addition, each embodiment can be implemented in any combination within a consistent range.

10 ... mail monitoring device, 11 ... network interface circuit (network I / F circuit), 12 ... terminal interface circuit (terminal I / F circuit), 13 ... storage circuit, 13A ... stagnant mail, 13P ... program, 14 ... control circuit , 14A ... Relay processing unit, 14B ... Retention processing unit, 14C ... Check request unit, 14D ... Check result acquisition unit, 20, # 1, # 2, ~, # n ... User terminal, 30 ... Mail server, 31 ... Partner Terminals, L1, L2 ... communication lines, NW ... communication networks.

Claims (6)

A storage circuit that retains outgoing mail sent from the user terminal for a certain period of time, and
A control circuit for relaying or canceling the transmission of the sent mail to the mail server based on the check result of whether or not the sent mail can be sent is provided.
The control circuit
Among the destination terminals specified in the sent mail, the second user terminal belonging to the same domain as the first user terminal that is the sender of the sent mail is referred to by the user of the second user terminal. A check request section that sends a check request email to request a check of whether or not the sent email can be sent, and a check request section
If the second user terminal notifies that the sent mail cannot be sent before the residence period expires, the forwarding of the sent mail held in the storage circuit to the mail server is stopped. A mail monitoring device characterized by having a relay processing unit. In the mail monitoring device according to claim 1,
When the second user terminal notifies the transmission permission of the transmission mail before the expiration of the residence period, the relay processing unit acquires the transmission mail held in the storage circuit. , A mail monitoring device characterized by relay forwarding to the mail server. In the mail monitoring device according to claim 1 or 2.
If the second user terminal does not notify whether or not the transmitted mail can be transmitted before the expiration of the residence period, the relay processing unit holds the relay processing unit in the storage circuit according to the expiration of the residence period. An e-mail monitoring device characterized by acquiring the sent e-mail and relaying it to the mail server. In the mail monitoring device according to any one of claims 1 to 3.
When the destination terminal includes a plurality of the second user terminals, the check request unit transmits the check request mail to the plurality of second user terminals.
When the relay processing unit receives a notification of transmission permission for the transmitted mail from at least one of the plurality of second user terminals before the expiration of the residence period, the relay processing unit may use the relay processing unit. A mail monitoring device characterized in that the transmitted mail held in a storage circuit is acquired and relayed to the mail server. In the mail monitoring device according to any one of claims 1 to 4.
When the second user terminal is not included as the destination terminal specified in the sent mail, the relay processing unit relays and forwards the sent mail to the mail server without sending the check request mail. A mail monitoring device characterized by A storage circuit that retains the sent mail sent from the user terminal for a certain residence period, and a control circuit that relays or cancels the forwarding of the sent mail to the mail server based on the check result of whether or not the sent mail can be sent. This is a mail monitoring method used in a mail monitoring device equipped with.
The control circuit refers to the second user of the destination terminals specified in the sent mail with respect to the second user terminal belonging to the same domain as the first user terminal that is the source of the sent mail. A check request step for sending a check request mail for requesting a check of whether or not the sent mail can be sent by the terminal user, and a check request step.
When the control circuit receives a notification from the second user terminal that the transmitted mail cannot be transmitted before the residence period expires, the mail server of the transmitted mail held in the storage circuit is notified. A mail monitoring method characterized by having a relay processing step for canceling the forwarding of the mail.

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