JP5716000B2 - E-mail system, e-mail transmission / reception method and program - Google Patents

Description

  The present invention relates to an e-mail system, an e-mail transmission / reception method, and a program.

  When an e-mail is sent with a file attached, there are many cases where the recipient does not necessarily want to view the contents of the attached file. The reception of a file that is not desired to be browsed places an unnecessary load on a network such as an in-house LAN (Local Area Network) and leads to accumulation of unnecessary data in the receiving terminal.

  Therefore, as a conventional technique, Patent Document 1 discloses that a mail body and an attached file are separated in a mail server and stored in a database, and a URL (Uniform Resource Locator) of the database is added to the mail body. There has been proposed a technique for downloading an attached file by designating.

  Patent Document 2 proposes a technique in which a shortcut is created in a mail transmission terminal, a file is registered in a database, the shortcut is attached to a mail text, and the recipient is displayed with the shortcut. ing.

JP 2002-073505 A JP 2009-295038 A

  However, in the technique of Patent Document 1, unlike a normal mail operation, a procedure for downloading a file by specifying a URL occurs. In the technique of Patent Document 2, it is necessary to add a function to the conventional mailer of each terminal. Also, when transferring a file, it is necessary to perform a procedure such as creating a shortcut again on the terminal side.

  The present invention has been made paying attention to the above circumstances, and the object of the present invention is to make it possible to use a conventional mailer as it is, and to reduce the load on the network due to transmission / reception of an attached file, e-mail transmission / reception method, and To provide a program.

In order to achieve the above object, the first aspect of the electronic mail system, the electronic mail transmission / reception method and the program according to the present invention is capable of separating the attached file from the attached mail addressed to the receiving terminal and allowing the receiving terminal to access In the database, create a shortcut based on the storage location of the attached file, and send the shortcut to the mail after separating the attached file at the recipient address of the received mail is CC (carbon copy) It is attached and distributed to the receiving terminal, and the mail with the attached file is distributed to the transmission destination of the normal destination (TO) or BCC (blind carbon copy) .

  According to the first aspect, the conventional mailer can be used as it is and browsing of the attached file is performed in the same procedure as the conventional mailer, but the load on the network due to the reception of the attached file is reduced, and the receiving terminal Unnecessary data accumulation can be suppressed.

According to the first aspect, and send an email with shortcuts attached to the destination address type is C C, the destination type is the destination of a normal destination (TO) or BCC, the attachments mail It becomes possible to transmit. By doing so, the attached file itself is sent to the substantial target person, so the convenience can be improved.

  That is, according to the present invention, it is possible to provide an e-mail system, an e-mail transmission / reception method, and a program that can use a conventional mailer as it is and can reduce the load on the network due to transmission / reception of an attached file.

1 is an overall configuration diagram of an electronic mail system according to an embodiment of the present invention. FIG. 3 is a diagram illustrating an operation outline of the electronic mail system according to the first embodiment. 5 is a flowchart illustrating a processing procedure of the mail server according to the first embodiment. FIG. 10 is a diagram illustrating an operation outline of an electronic mail system according to a second embodiment. 9 is a flowchart showing a processing procedure of a mail server in Embodiment 2. FIG. 10 is a diagram illustrating an operation outline of an electronic mail system according to a third embodiment. 10 is a flowchart illustrating a processing procedure of a mail server according to the third embodiment. FIG. 10 is a diagram illustrating an operation outline of an electronic mail system according to a fourth embodiment. 10 is a flowchart showing a processing procedure of a mail server in Embodiment 4.

Embodiments according to the present invention will be described below with reference to the drawings.
FIG. 1 is an overall configuration diagram of an electronic mail system according to an embodiment of the present invention. The mail server 1 is connected to the shared database server 2 and the local terminals 3-1 to 3-n (generically referred to as the local terminal 3) on the in-house LAN, and further connected to the Internet via a router or the like. 4 can receive e-mails, and can send and receive e-mails to and from the local terminal 3.

  The mail server 1 includes a mail reception unit 11, a mail transmission unit 12, and an address table 13. The mail receiving unit 11 receives mail transmitted from the external terminal 4 via the Internet based on Simple Mail Transfer Protocol (SMTP), and at the same time requests from the local terminal 3 such as POP (Post Office Protocol). Deliver mail received by. The mail transmission unit 12 performs transfer processing of mail transmitted from the local terminal 3 based on SMTP. The address table 13 stores the e-mail address of the local terminal 3 serving as a mail client.

  Further, as shown in FIG. 1, the mail receiving unit 11 separates a file attached to an e-mail and stores it in the shared database server 2, and the storage location of the shared database server 2 for this file And a shortcut creation unit 112 for creating a shortcut based on the above. The mail transmission unit 12 includes a shortcut delivery determination unit 121 that performs a process of transferring a mail attached with a shortcut.

  In such a configuration, when the mail server 1 receives mail with an attached file addressed to a plurality of local terminals 3, the mail server 1 shares the file with the shared database server 2 on the network without sending the attached file to all the destination terminals. And allows the recipient to view and use the file as needed. Hereinafter, the operation of the mail server 1 will be described according to each embodiment.

[Example 1]
FIG. 2 shows an outline of the operation of the electronic mail system according to the first embodiment. For example, it is assumed that the mail sender broadcasts an email with an attached file from the external terminal 4 to a plurality of local terminals 3-1 to 3-3 as destinations. The mail server 1 stores the attached file in the shared database server 2, and distributes the mail body with the attached file shortcut attached to the destination. The recipient can access the file stored in the shared database server 2 by clicking the shortcut.

FIG. 3 is a flowchart illustrating the processing procedure of the mail server according to the first embodiment.
When the mail receiving unit 11 receives a mail with an attached file from the external terminal 4 (step S1a), the attached file storage unit 111 separates the file and the mail text (step S1b). Then, the attached file storage unit 111 generates a folder for storing attached files in the shared database server 2 (step S1c), and stores the file in the generated folder (step S1d). An access right (at least readable) to all receiving terminals (local terminals 3-1 to 3-3) as destinations is given to the folder for storing attached files. When the attached file storage unit 111 stores the attached file, the access authority of the folder for storing the attached file may be controlled based on a terminal identifier (IP address or the like) corresponding to the mail address.

  The shortcut creation unit 12 creates a shortcut specifying a file link destination based on the generated folder path (step S1e), and attaches the created shortcut to the mail body (step S1f). In response to a request from the receiving terminal, the mail receiving unit 11 distributes the mail attached with the created shortcut to the destination (step S1g).

A shortcut for accessing the file body of the attached file is attached to the received mail of each local terminal 3-1 to 3-3, and the recipient accesses the file in the shared database server 2 by clicking the shortcut. Can do.
As a result, the conventional mailer can be used as it is, and the attached file can be browsed in the same procedure as the conventional mailer, but the network load due to the reception of the attached file is reduced, and unnecessary data is accumulated in the receiving terminal. Can be suppressed.

  In general, the access right of the folder for storing the attached file is desirably read-only because editing of the file affects other recipients. In the case of read-only, it can be downloaded from the shared database server 2 to each receiving terminal and used as necessary. Further, the access right of the folder for storing attached files may be set based on the destination type, such that writing is possible when the destination type is TO and read-only when the destination type is CC or BCC.

[Example 2]
FIG. 4 shows an outline of the operation of the electronic mail system according to the second embodiment. Here, it is assumed that the mail sender broadcasts a shortcut-attached mail from the local terminal 3-1 to a plurality of destinations (the local terminal 3-4 and the external terminal 4). The mail server 1 searches for the file body corresponding to the shortcut, attaches it to the mail, and sends it to each destination. At this time, for the local terminal 3-4 whose destination is addressed to the same mail server, the attached file is separated again according to the first embodiment, and a shortcut is created.

FIG. 5 is a flowchart illustrating the processing procedure of the mail server according to the second embodiment.
When the mail transmission unit 12 receives a transmission mail attached with a shortcut from the local terminal 3-1 (step S2a), the shortcut transmission determination unit 121 determines whether there is a corresponding file at the shortcut link destination (step S2b). ). If the corresponding file does not exist in the shared database server 2, the shortcut delivery determination unit 121 notifies the sender of a transmission error (step S2c).

  Next, the shortcut sending determination unit 121 separates the shortcut from the mail body (step S2d), acquires the file body corresponding to the shortcut from the shared database server 2, and attaches it to the mail body (step S2e). The mail transmitting unit 12 transfers the mail with the attached file to the destination (local terminal 3-4 and external terminal 4) (step S2f).

  Here, when the transmission destination is addressed to the address using the same mail server, the mail receiving unit 11 executes the processing of steps S1a to S1g in FIG. 3, and separates the attached file again to create a shortcut. The mail with the shortcut attached is distributed to the local terminal 3-4.

  According to the second embodiment, when the mail with the shortcut attached is transmitted, the file body corresponding to the shortcut is automatically attached to the mail and transmitted. The transmission process can be performed by the same operation as a conventional mailer without requiring any special operation without being aware of the above.

[Example 3]
FIG. 6 shows an outline of the operation of the electronic mail system according to the third embodiment. Here, it is assumed that the mail sender broadcasts a shortcut-attached mail from the local terminal 3-1 to a plurality of destinations (the local terminal 3-4 and the external terminal 4). The mail server 1 determines whether the shortcut can be sent as it is for each destination, and in the case of a destination that can be browsed by the shortcut (local terminal 3-4), the shortcut is delivered as it is, and the destination where the shortcut cannot be used (external terminal) In the case of 4), the file is attached and transferred.

FIG. 7 is a flowchart illustrating the processing procedure of the mail server according to the third embodiment.
When the mail transmission unit 12 receives the transmission mail attached with the shortcut from the local terminal 3-1 (step S3a), the shortcut transmission determination unit 121 determines whether or not there is a corresponding file at the shortcut link destination (step S3b). ). If the corresponding file does not exist in the shared database server 2, the shortcut delivery determination unit 121 notifies the sender of a transmission error (step S3c).

  Next, the shortcut delivery determination unit 121 determines whether or not the transmission destination address is a predetermined address accessible to the shared database server 2 (step S3d). For example, the address stored in the address table 13 is compared with the destination address to determine whether the address is for the same mail server. If the destination address is a predetermined address, the mail receiving unit 11 receives the mail with the shortcut attached, and distributes it to the destination in response to a request from the receiving terminal (step S3e). In this case, when receiving the mail with the shortcut attached, the mail receiving unit 11 does not perform the operation of separating the attached file and creating the shortcut, and directly sends the mail with the shortcut attached (local terminal 3-4). ). In addition, the mail receiving unit 11 assigns the access right (at least read-only) to the file storage folder corresponding to the shortcut to the destination terminal (local terminal 3-4) as the destination.

  On the other hand, if it is not a predetermined address, the shortcut delivery determination unit 121 separates the shortcut from the mail body (step S3f), acquires the file body corresponding to the shortcut from the shared database server 2, and attaches it to the mail body (step S3g). ). The mail transmitting unit 12 transfers the mail with the attached file to the destination (external terminal 4) (step S3h).

  According to the third embodiment, when a mail with a shortcut attached is forwarded, the mail with a shortcut attached is transmitted to an address using the same mail server. Can be suppressed. In addition, since an e-mail attached with the file body is transmitted to an external terminal that cannot use the shortcut, it is possible to reliably notify the recipient of the content to be transmitted.

[Example 4]
FIG. 8 shows an outline of the operation of the electronic mail system according to the fourth embodiment. Here, the mail sender sends an email with an attached file from the external terminal 4 with the local terminals 3-1 and 3-2 as the CC (carbon copy) destination and the local terminal 3-3 as the BCC (blind carbon copy) destination. Will be broadcast as. The mail server 1 determines whether to send a shortcut or a file depending on the destination type. For example, a mail with a shortcut is distributed to a CC transmission destination, and a mail with an attached file is distributed to a normal destination (TO) or a BCC transmission destination.

FIG. 9 is a flowchart illustrating the processing procedure of the mail server according to the fourth embodiment.
When receiving the mail with the attached file (step S4a), the mail receiving unit 11 acquires transmission destination information (step S4b), and determines whether the CC destination is included (step S4c). If the CC address is not included, the mail receiver 11 delivers the mail with the attached file as it is (step S4d). If the CC address is included, the file and the mail text are separated (step S4e). Then, the attached file storage unit 111 generates a folder for storing files in the shared database server 2 (step S4f), and stores the file in the generated folder (step S4g).

  The shortcut creation unit 112 creates a shortcut specifying a file link destination based on the generated folder path (step S4h), and attaches the shortcut to the mail body (step S4i). The mail receiving unit 11 distributes the mail with the shortcut attached to the CC destination, and distributes the mail with the attached file to other destinations (step S4j).

  According to the fourth embodiment, for example, it is possible to send a mail with a shortcut attached to a CC destination, and to deliver a mail with an attached file to a normal destination (TO). By doing so, the attached file itself is sent to the substantial target person, so the convenience can be improved.

  As described above, according to the above-described embodiment, the conventional mailer can be used as it is, and the load on the network due to the transmission / reception of the attached file is performed while the attachment file is viewed and transferred in the same procedure as the conventional mailer. It is possible to provide a mechanism that reduces the amount of data and does not receive unnecessary attachments.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

  DESCRIPTION OF SYMBOLS 1 ... Mail server, 11 ... Mail receiving part, 111 ... Attached file storage part, 112 ... Shortcut creation part, 12 ... Mail transmission part, 121 ... Shortcut determination part, 13 ... Address table, 2 ... Shared database server, 3-1. ~ 3-n ... local terminal, 4 ... external terminal.

Claims (5)

Means for receiving an email with an attachment addressed to a receiving terminal connected to the local network from an external terminal;
Means for separating an attached file from an email with an attached file addressed to the receiving terminal and storing it in a database accessible by the receiving terminal;
Means for creating a shortcut based on the storage location of the attachment;
Based on the destination type of the received mail, the CC (carbon copy) destination is attached to the mail with the attached file separated and delivered to the receiving terminal, and is sent to the receiving terminal. A BCC (blind carbon copy) destination is provided with means for delivering the mail with the attached file . Means for receiving an email with an attachment addressed to a receiving terminal connected to the local network from an external terminal;
Means for separating an attached file from an email with an attached file addressed to the receiving terminal and storing it in a database accessible by the receiving terminal;
Means for creating a shortcut based on the storage location of the attachment;
Means for attaching the shortcut to the mail and delivering it to the receiving terminal;
The attached file in the database is set to be writable when the destination type of the received mail is a normal destination (TO) and read-only when the destination type is CC (carbon copy) or BCC (blind carbon copy). Means to set access rights to the storage location
An e-mail system comprising: Receiving an email with an attachment addressed to a receiving terminal connected to the local network from an external terminal;
Separating the attached file from the mail with the attached file addressed to the receiving terminal and storing it in a database accessible to the receiving terminal;
Creating a shortcut based on the storage location of the attachment;
Based on the destination type of the received mail, the CC (carbon copy) destination is attached to the mail with the attached file separated and delivered to the receiving terminal, and is sent to the receiving terminal. A method of transmitting and receiving an e-mail, comprising: delivering a mail with an attached file to a destination of a BCC (blind carbon copy) . Receiving an email with an attachment addressed to a receiving terminal connected to the local network from an external terminal;
Separating the attached file from the mail with the attached file addressed to the receiving terminal and storing it in a database accessible to the receiving terminal;
Creating a shortcut based on the storage location of the attachment;
Attaching the shortcut to the mail and delivering it to the receiving terminal;
The attached file in the database is set to be writable when the destination type of the received mail is a normal destination (TO) and read-only when the destination type is CC (carbon copy) or BCC (blind carbon copy). And setting an access right to the storage location of the e-mail. The program which makes a computer perform each step contained in the email transmission / reception method of Claim 3 or 4 .

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