JP2012094110A - Information processor, and control method and program therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce administrator's work for registering a limitation size for a transmission destination with a server, and also enable a transmitter to transmit an e-mail with a certain data size to a transmission destination without being conscious of a process concerning the e-mail.SOLUTION: An information processor acquires divided mails transmitted from a transmission terminal, and performs a predetermined process on data included in an e-mail acquired by combining the divided mails. Then, the information processor transmits divided mails acquired by dividing the email including the data on which the predetermined process has been performed into each piece equal to or less than a predetermined size for relaying it.

Description

  The present invention relates to an information processing apparatus, a control method therefor, and a program, and more particularly to a technique for relaying an electronic mail transmitted from a transmission terminal.

  2. Description of the Related Art Conventionally, an e-mail server may be set to limit the maximum size of one e-mail to be received in order to prevent a heavy load on the e-mail server and a storage area being tight.

  Therefore, the user can divide the e-mail and send it to the destination e-mail server by using a division function (a function to divide the e-mail into a specified size or less) provided in the mail client software (mailer). Sending.

  In Patent Document 1 and Patent Document 2, an apparatus (in which a size to be divided for each transmission destination is registered in advance, and one e-mail is divided and transmitted so as to be equal to or smaller than the pre-registered size ( Sender terminal) is described.

  In addition, as a mechanism for automatically performing this division processing not by a sender terminal but by an e-mail server, Patent Document 3 discloses that the e-mail mail size is equal to or larger than a specified value set in the e-mail server. Describes a mechanism in which the electronic mail server divides and transmits the electronic mail.

  In order to send e-mail safely, for example, data included in the e-mail (e-mail address of the destination, e-mail body, attached data, etc.) is inspected or attached to the e-mail. The file is required to be automatically encrypted and transmitted, and Patent Document 4 describes that a mail server encrypts and transmits an attached file attached to an e-mail. .

JP 2001-216221 A JP 2001-236275 A JP 2001-326691 A JP 2009-080847 A

  However, in Patent Document 3, in order to automatically divide and transmit an e-mail, the administrator must set a limit size in advance in the server for each transmission destination. Therefore, the more transmission destinations the user transmits, the more complicated the administrator's registration work for the limit size of each transmission destination.

  To alleviate this, use the mailer's split function of the sender terminal that sends the e-mail, and send the e-mail to be sent so that it is smaller than the limit size of the destination. Can be considered.

  In addition, in order to prevent information leakage due to transmitted e-mail, it is considered that a relay processing device (server) that relays e-mail inspects data included in the e-mail before transmitting the e-mail. However, since the relay processing apparatus receives the divided mail obtained by dividing the electronic mail, it is difficult to inspect the data included in the electronic mail.

  Therefore, it is conceivable that the relay processing apparatus inspects the data included in the e-mail generated by combining the divided e-mails. As a result, there is a possibility that an electronic mail exceeding the limit size of the transmission destination may be transmitted.

  In addition, as described above, in order to transmit an e-mail safely, it is conceivable that the relay processing apparatus performs, for example, encryption processing of an unattached e-mail attachment and relays the e-mail. However, the data size of the whole e-mail of the e-mail that has been subjected to such processing becomes larger than the data size of the whole e-mail of the e-mail before the processing, and as a result, the e-mail that exceeds the limit size of the destination There is a risk of sending an email.

  Therefore, the user must create an e-mail not only for the limit size of the destination but also for the processing performed by the relay processing device that relays the mail. It was difficult to set easily.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to reduce an administrator's registration work on a server with a limit size for a transmission destination, and without limiting the size of the transmission destination without the sender being aware of processing related to an electronic mail in the server. Is to efficiently send e-mails that do not exceed.

  The present invention is a relay processing device that is communicable with a transmission terminal that transmits a divided mail obtained by dividing an electronic mail, and relays an electronic mail obtained from the divided mail transmitted from the transmission terminal to a destination of the electronic mail. An acquisition means for acquiring the divided mail transmitted from the transmission terminal, a combining means for combining the divided mail acquired by the acquisition means, and an electronic device obtained by combining the divided mail by the combining means A processing unit that performs a predetermined process on data included in the mail and an e-mail that includes the data processed by the processing unit are divided so that the size is equal to or smaller than the predetermined size or smaller than the predetermined size. Splitting means, and transmitting means for transmitting the split mail obtained by splitting the electronic mail by the splitting means to relay. To.

  In addition, the present invention is capable of communicating with a transmission terminal that transmits a divided mail obtained by dividing an electronic mail, and performs relay processing for relaying an electronic mail obtained from the divided mail transmitted from the transmission terminal to a destination of the electronic mail An apparatus control method, wherein the relay processing apparatus acquisition means acquires a split mail transmitted from the transmission terminal, and the relay processing apparatus combining means acquires the split mail acquired in the acquisition step. And a processing step in which the processing means of the relay processing device performs a predetermined process on data included in the e-mail obtained by combining the divided mails in the combining step; The dividing means of the relay processing apparatus makes the e-mail including the data processed in the processing step smaller than a predetermined size or smaller than a predetermined size. And a transmission step of transmitting the divided mail obtained by dividing the e-mail in the dividing step so as to relay the divided mail. .

  In addition, the present invention is capable of communicating with a transmission terminal that transmits a divided mail obtained by dividing an electronic mail, and performs relay processing for relaying an electronic mail obtained from the divided mail transmitted from the transmission terminal to a destination of the electronic mail An apparatus that can be read and executed by an apparatus, wherein the relay processing device acquires an acquisition unit that acquires a divided mail transmitted from the transmission terminal, a combination unit that combines the divided mail acquired by the acquisition unit, and the combination Processing means for performing a predetermined process on data included in the e-mail obtained by combining the divided mails by means, and an e-mail including the data processed by the processing means having a predetermined size or less, Alternatively, a dividing unit that divides the electronic mail into a size smaller than a predetermined size, and a division obtained by dividing the electronic mail by the dividing unit Characterized in that to function as transmission means for transmitting to relays Lumpur.

  The present invention reduces the registration work to the server of the limit size for the destination by the administrator, and the electronic device that does not exceed the limit size of the destination without the sender being aware of the processing related to the e-mail in the server. E-mail can be sent efficiently.

1 is a block diagram schematically showing a system configuration of an information processing system according to an embodiment of the present invention. 1 is a block diagram schematically showing the hardware configuration of the client apparatuses 101-1 and 101-2, the administrator client apparatus 102, the internal mail server 103, and the external mail servers 106-1 and 106-2 and 106-3 in FIG. It is. 3 is a schematic diagram showing a functional configuration of an internal mail server 103. FIG. 6 is a flowchart illustrating an example of an e-mail relay processing unit 321. 6 is a diagram illustrating an example of a division information table 343. FIG. 10 is a flowchart illustrating details of a split mail combination processing unit 322; 6 is a diagram illustrating an example of an input screen 700 for a mail control rule. FIG. 6 is a diagram illustrating an example of a mail control rule table 341. FIG. 6 is a flowchart illustrating an example of split mail transmission processing by the client apparatus 101. 6 is a diagram illustrating an example of a transmission limit size table 342. FIG.

  Hereinafter, the present invention will be described in detail according to preferred embodiments with reference to the accompanying drawings.

  FIG. 1 is a block diagram schematically showing a system configuration of an information processing system according to an embodiment of the present invention. Note that the configurations of the various terminals shown in FIG. 1 are merely examples, and it goes without saying that there are various configuration examples depending on the purpose and application.

  As shown in FIG. 1, the intranet 100 of the information processing system according to the present embodiment includes client apparatuses 101-1 and 101-2 (hereinafter referred to as the client apparatus 101), an internal mail server 103, and an internal mail server 103. An administrator client device 102 used by an administrator who manages various functions is installed, and these devices are connected to each other via a local area network (LAN) 104 so that they can communicate with each other.

  In FIG. 1, reference numeral 103 denotes an internal mail server.

  The internal mail server 103 performs processing such as encryption and compression of e-mail data (text and attached file) sent from the local area network 104 to the wide area network 105, and addition of data such as a signature. By performing this function, a conversion function for converting the e-mail data (text, attached file, etc.), a function for storing conditions for determining whether to perform conversion processing by the conversion function, and the conditions are registered. , Has a function to change (update).

  Further, the internal mail server 103 includes a data inspection function for performing a data inspection process for inspecting e-mail data (text, attached file, etc.) sent from the local area network 104 to the wide area network 105, and As a result of performing the data inspection process by the data inspection function, it is determined whether to relay to the destination of the e-mail. If it is determined to relay, the relay (transmission) to the destination is performed and the relay is performed. If it is determined not to perform the relaying, a function of controlling not to relay (transmit) to the destination is provided.

  In addition, the internal mail server 103 combines a combined function that combines the received e-mails (referred to as divided mails) received from the client device 101, and an e-mail that is generated by combining the combined functions (also referred to simply as mails). The data included in the data is converted by the conversion function, and the electronic mail including the converted data is divided and transmitted.

  Further, the internal mail server 103 inspects the data included in the e-mail (also simply referred to as e-mail) generated by the combination function by the data inspection function, and receives the e-mail including the inspected data. It has a function of dividing and transmitting.

  The internal mail server 103 transmits / receives electronic mail between the client device 101-1 and the client device 101-2, and the device outside the client device 101-1 and the local area network 104 (in FIG. 1, the external mail server 106). -1, 106-2, 106-3) that manages the transmission / reception of e-mail to / from the destination (destination) (e-mail address) set in the e-mail. Performs transmission (relay) processing.

  The internal mail server 103 is an application example of the relay processing device (information processing device) of the present invention.

  Further, the client devices 101-1 and 101-2 are information processing devices (transmission terminals), and as shown in FIG. 1, the mail client software 111 (hereinafter referred to as mailer 111) is installed and has an e-mail transmission / reception function. .

  The external mail servers 106-1, 106-2, and 106-3 are unshown receiving terminals (information processing apparatuses) that are destinations (transmission destinations) of e-mails transmitted from the client apparatuses 101-1 and 101-2, respectively. ).

Hereinafter, the hardware of the client devices 101-1 and 101-2, the administrator client device 102, the internal mail server 103, and the external mail servers 106-1, 106-2, and 106-3 shown in FIG. 1 will be described with reference to FIG. The hardware configuration will be described.

FIG. 2 schematically shows the hardware configuration of the client devices 101-1 and 101-2, the administrator client device 102, the internal mail server 103, and the external mail servers 106-1, 106-2, and 106-3 in FIG. It is a block diagram shown in FIG.

In FIG. 2, reference numeral 201 denotes a CPU that comprehensively controls each device and controller connected to the system bus 204. Further, the ROM 202 or the external memory 211 has a BIOS (Basic Input / Output System) or an operating system program (hereinafter referred to as OS), which is a control program of the CPU 201, and functions executed by each server or each PC (information processing apparatus). Various programs and the like to be described later necessary for the realization are stored.

A RAM 203 functions as a main memory, work area, and the like for the CPU 201. The CPU 201 implements various operations by loading a program or the like necessary for execution of processing from the ROM 202 or the external memory 211 into the RAM 203 and executing the loaded program.

An input controller 205 controls input from a keyboard (KB) 209 or a pointing device such as a mouse (not shown). A video controller 206 controls display on a display (display unit) such as a CRT display (CRT) 210. In FIG. 2, although described as CRT 210, the display device is not limited to the CRT, but may be another display device such as a liquid crystal display. These are used by the administrator as needed.

A memory controller 207 is provided in an external storage device (hard disk (HD)), flexible disk (FD), or PCMCIA card slot for storing a boot program, various applications, font data, user files, editing files, various data, and the like. Controls access to an external memory 211 such as a compact flash (registered trademark) memory connected via an adapter.

A communication I / F controller 208 connects and communicates with an external device via a network, and executes communication control processing on the network. For example, communication using TCP / IP is possible.

Note that the CPU 201 enables display on the CRT 210 by executing outline font rasterization processing on a display information area in the RAM 203, for example. In addition, the CPU 201 enables a user instruction with a mouse cursor (not shown) on the CRT 210.

Various programs to be described later for realizing the present invention are recorded in the external memory 211 and executed by the CPU 201 by being loaded into the RAM 203 as necessary. Further, files and various tables used when executing the program are also stored in the external memory 211.

  FIG. 3 is a schematic diagram showing a functional configuration of the internal mail server 103.

  As shown in FIG. 3, the internal mail server 103 includes a mail control rule setting unit 311, a transmission limit size table registration unit 312, a mail control rule table 341 (FIG. 8), a transmission limit size table 342 (FIG. 10), and division information. A table 343 (FIG. 5), a divided mail storage queue 344, a mail relay processing unit 321 and a divided mail combination processing unit 322 are provided.

  The mail control rule table 341 (FIG. 8), the transmission limit size table 342 (FIG. 10), and the division information table 343 (FIG. 5) are stored in the external memory 211 of the internal mail server 103. The external memory 211 of the internal mail server 103 is allocated as an area for storing the divided mail.

  The mail control rule setting unit 311 accepts input of mail control rules such as a condition for converting mail received from the client device and a conversion method (details will be described later with reference to FIGS. 7 and 8) from the user, and performs mail control. Set (register, modify, delete, etc.) in the rule table 341 (FIG. 8).

  In order to accept the input of the mail control rule, the mail control rule setting means 311 transmits, for example, information for displaying the mail control rule input screen 700 as shown in FIG. The user client device 102 displays the mail control rule input screen 700 on the display device (CRT) 210 according to the received information.

  The administrator gives an instruction to register, modify, or delete the mail control rule input via the mail control rule input screen 700.

  FIG. 7 is a diagram showing an example of a mail control rule input screen displayed on the display device (CRT) 210 of the administrator client device 102.

  In the input screen 700 shown in FIG. 7, as a mail control rule, an ID 701 for uniquely identifying the mail control rule, a From 702 indicating the condition of the mail address of the mail transmission source, To 703 indicating the condition of the mail address of the destination, and others The conversion of conversion such as addition of data such as encryption, compression, signature, etc. for the condition 704 such as the subject and body of the mail, the keyword included in the attached file, and the mail data (the body and attached file etc.) matching these conditions Control for accepting input of content 705 and transmission control content 708 indicating whether or not mail that matches these conditions is relayed (transmitted) to the destination is prepared. Various types of data input via the screen 700 are accepted as mail control rules.

  When the administrator client apparatus 102 receives an input of a mail control rule from the administrator via the input screen 700 and the registration button 706 is pressed, the registration request for the input mail control rule is sent to the internal mail server 103. Send to. When receiving the registration request, the mail control rule setting unit 311 of the internal mail server 103 registers (updates) the mail control rule included in the registration request in the mail control rule table 341 shown in FIG.

  When the administrator client apparatus 102 designates a mail control rule via the input screen 700 and the delete button 707 is pressed, the administrator client apparatus 102 issues a deletion request for the designated mail control rule to the internal mail. To the server 103. When receiving the deletion request, the mail control rule setting unit 311 of the internal mail server 103 deletes the mail control rule included in the deletion request from the mail control rule table 341.

  FIG. 8 is a diagram illustrating an example of the mail control rule table 341.

  As shown in FIG. 8, the mail control rule table 341 includes an ID 801 for uniquely identifying a mail control rule, a sender mail address 802, a destination mail address 803, and other conditions such as keywords and attached files. Information (conversion 805) indicating the contents of conversion processing performed on the mail that matches the conditions 804, 802, 803, and 804, and mail that matches the conditions 802, 803, and 804 are relayed (transmitted) to the destination. Transmission control content 806 indicating whether or not.

  For example, the mail control rule whose ID 801 is 1 is that the transmission source mail address 802 is “taro@example.jp”, the destination mail address 803 is an arbitrary address “*”, and other conditions 804. Are “keyword“ confidential ”included”, “encryption” is set in the conversion 805, and “send” is set in the transmission control content 806.

  For example, if the e-mail address of the e-mail received from the client device is “taro@example.jp” and the attached file of the e-mail includes “confidential” as a keyword, the e-mail Indicates that it matches the condition of the mail control rule whose ID is “1”. In addition, as indicated by 805, it is defined that an attached file of an e-mail that meets this condition is encrypted. Further, as indicated by reference numeral 806, it is stipulated that an e-mail meeting this condition is relayed (transmitted) to a destination.

  Further, in 804, it is defined as a condition that encryption, compression, or signature (addition of data such as a signature) is performed according to the format of the attached file of the e-mail. In this way, it is possible to define what conversion processing is performed according to the file format. For example, if the file format is not encrypted, it is possible to set the encryption.

  For example, the condition 804 with an ID of 3 stipulates that the attached file is “compressed” as the conversion process 805 when the file format of the attached file of the e-mail is “xls”.

  As described above, 802, 803, and 804 shown in FIG. 8 function as execution conditions for executing the conversion process 805.

Further, as shown in FIG. 8, in the mail control rule table 341, for example, in the case of a mail control rule with ID “5”, the data included in the email whose destination is “example2.ne.jp” (the mail text) Or the attached file includes the keyword “public”, the conversion 805 is set to “not”, and the conversion processing such as encryption, compression, and signature addition is performed on the data. Since the transmission control content 806 is set to “send”, it is set to relay (send) the e-mail.

As described above, the mail control rule whose ID is “5” is searched for whether or not a predetermined keyword (character) is included in the data (e-mail body, attached file, etc.) included in the e-mail. It is stipulated that data is inspected and an e-mail including the inspected data is transmitted to a destination.

Further, in the case of the mail control rule with ID “6”, if the keyword “confidential” is included in the data (email body, attached file, etc.) included in the e-mail whose destination is “example3.com” Since “No” is set in the conversion 805, conversion processing such as encryption, compression, and signature addition is not performed on the data, and “Do not transmit” is set in the transmission control content 806. The electronic mail is set not to be relayed (transmitted).

As described above, the mail control rule whose ID is “6” is searched by searching for a predetermined keyword (character) in the data (email body, attached file, etc.) included in the e-mail. It is stipulated that data is inspected and an e-mail containing the inspected data is not sent to a destination.

  Returning to the description of FIG.

  The transmission limit size table registration unit 312 analyzes the data size of the electronic mail (including divided mail) received from the client apparatus 101 and stores it in the transmission limit size table 342 (FIG. 10).

  FIG. 10 is a diagram illustrating an example of the transmission limit size table 342. As shown in FIG. 10, the transmission limit size table 342 includes an ID 1001 for uniquely identifying the transmission limit size information, and transmission limit size information specified by the ID (mail destination domain 1002, limit size 1003). Is recorded.

  For example, in the transmission limit size information with ID 1001 of 1, “example.com” is set as the mail destination domain 1002, and “1024000” is set as the limit size 1003. In FIG. 10, the destination domain 1002 is described as the mail transmission destination, but the mail address of the transmission destination may be used. In this case, “destination domain” described in the present embodiment may be read as “destination mail address”.

  Returning to the description of FIG.

  The mail relay processing unit 321 shown in FIG. 3 is a process that is executed every time the mail is received by the internal mail server 103. Details of the processing will be described with reference to FIG.

  If the email received from the client device 101 is a split mail, the split mail is stored and saved in the split mail storage queue 344.

  The divided mails stored in the divided mail storage queue 344 are combined by a split mail combining processing unit 322 (details will be described later with reference to FIG. 6) that are executed periodically.

  If the received mail is not a divided mail, the mail relay processing unit 321 determines whether the mail matches the mail control rule conditions (conditions 802, 803, and 804) in the mail control rule table 341. To do.

  Then, conversion processing is performed according to the mail control rule that matches the condition. When the data size of the mail after conversion exceeds the limit size registered in the transmission limit size table 342, the mail is divided and transmitted so as to be equal to or smaller than the limit size. . On the other hand, if it is less than the limit size, it is transmitted as it is without being divided.

  First, a process in which the client apparatus 101 creates and transmits an e-mail will be described with reference to FIG.

  FIG. 9 is a flowchart illustrating an example of split mail transmission processing by the client apparatus 101.

  The processing of each step shown in FIG. 9 is realized by the CPU 201 of the client apparatus 101 loading a program stored in a storage unit such as the external memory 211 into the RAM 203 and executing it.

  First, the client device 101 generates an e-mail by inputting a destination, a mail title, a mail text, attaching a file, etc. according to a user operation instruction (step S901).

  Then, when the client apparatus 101 receives from the user the transmission instruction for the electronic mail generated in step S901 (step S902), the data size of the entire electronic mail is set to the transmission destination set in the electronic mail. It is determined whether or not the corresponding limit size is exceeded (step S903).

  Here, the destination and the limit size that is the upper limit size of the email to be sent to the destination are associated with each other and stored for each destination (the destination email address or the destination domain) By referring to this information, it is determined whether the data size of the e-mail instructed to send exceeds the limit size of the destination set in the e-mail. When a plurality of transmission destinations are set in the e-mail, it is determined whether or not the maximum size of the plurality of transmission destinations exceeds the smallest size.

  If the client apparatus 101 determines that the data size of the e-mail instructed to transmit exceeds the limit size of the transmission destination set in the e-mail (step S903: YES), the client apparatus 101 The electronic mail is divided into sizes so as not to exceed or exceed the size (step S904).

  Then, the client apparatus 101 transmits the divided electronic mail (divided mail) to the internal mail server 103 in order to transmit it to the set destination (step S905).

  If the client apparatus 101 determines in step S903 that the data size of the e-mail instructed to transmit does not exceed the limit size of the transmission destination set in the e-mail (NO), The e-mail is transmitted to the internal mail server 103 in order to transmit to the set destination (step S905).

  In this way, by creating a mail and giving a transmission instruction by the user's operation, the electronic mail can be divided and transmitted so as not to exceed the size of the transmission destination of the electronic mail.

  Next, the details of the e-mail relay processing unit 321 executed each time the CPU 201 of the internal mail server 103 receives an e-mail from the client apparatus 101 will be described with reference to FIG.

  FIG. 4 is a flowchart illustrating an example of an e-mail relay processing unit 321.

  The processing of each step shown in FIG. 4 is realized by the CPU 201 of the internal mail server 103 loading a program stored in a storage unit such as the external memory 211 into the RAM 203 and executing it.

  First, the internal mail server 103 receives and acquires an electronic mail (message data) transmitted from the client device 101 (step S401).

  Next, the internal mail server 103 determines whether or not the value “message / partial” indicating the divided mail is included in the value of the “Content-Type:” field of the header information of the message data acquired in step S401. By doing so, it is determined whether or not the acquired electronic mail is a divided mail (step S402).

  If the internal mail server 103 determines that the acquired e-mail is a divided mail (YES in step S402), the process proceeds to step S411. On the other hand, if the internal mail server 103 determines that the acquired e-mail is not a divided mail (step S402). NO), the process proceeds to step S403.

  If the internal mail server 103 determines NO in step S402, the internal mail server 103 refers to the mail control rule table 341 (FIG. 8) stored in the external memory 211 of the internal mail server 103 and obtains the acquired electronic mail ( Data included in (message data) (sender, destination, mail text, attached file, etc.) matches any mail control rule (conditions 802, 803, 804) in the mail control rule table 341 (FIG. 8) It is determined whether or not (applicable) (step S403) (condition determining means).

  In step S403, for example, when it is determined whether the data included in the e-mail matches the mail control rule whose ID is 5 in the mail control rule table (FIG. 8), the destination of the e-mail is “* @ example2. ne.jp ”or whether the keyword“ public ”is included in the attached file of the e-mail. If the ID matches the mail control rule with ID 5, as will be described later, the conversion process is not performed and the e-mail is transmitted to be relayed.

  As described above, in the present invention, the data inspection process is performed by determining whether or not the mail control rule (conditions 802, 803, and 804) executed in step S403 is met (corresponding). The data inspection processing is described as an application example of the predetermined processing (processing means) of the present invention.

  If the internal mail server 103 determines in step S403 that there is a mail control rule in the mail control rule table 341 (FIG. 8) that matches the acquired message data (e-mail) (YES in step S403). However, if it is determined that there is no mail control rule that matches the message data in the mail control rule table 341 (FIG. 8) (NO in step S403), the process proceeds to step S404. Migrate to

  The internal mail server 103 indicates that the transmission control content 806 of the mail control rule determined to match in step S403 is “send” indicating that an email is to be transmitted, or “not to transmit an email”. It is determined whether it is “not transmitted” (step S4031).

  That is, in step S4031, it is determined whether or not transmission of an electronic mail is permitted according to the transmission control content 806 of the mail control rule determined to match the data included in the electronic mail.

  If the internal mail server 103 determines that the transmission of the electronic mail is permitted (the transmission control content 806 is “send”) (step S4031: YES), the process proceeds to step S405. . On the other hand, when it is determined that the transmission of the electronic mail is not permitted (the transmission control content 806 is “not transmitted”) (step S4031: NO), the process proceeds to step S410.

  If it is determined NO in step S403, the internal mail server 103 transmits (relays) the acquired message data to the transmission destination set in the message data (step S404).

  If it is determined in step S4031 that transmission is permitted (YES), data (title, mail text, attached file, etc.) included in the acquired electronic mail (message data) is included in the message data. The content of the conversion process defined in association with the matching mail control rule (805 in FIG. 8) is converted (step S405).

  In this way, the content of the process stored corresponding to the condition determined to match is determined as the content of the predetermined process (decision unit), and the process of the determined content is executed as the predetermined process. .

For example, if the content (805) of the conversion process defined in association with the matching mail control rule is “encryption”, for example, a process of encrypting an attached file included in the acquired message data is performed. Here, encryption is an example of processing for converting a file format into another file format. If the content of the conversion process (805) is “signature”, a process of adding the signature (data) to the message data (addition process of adding data to the e-mail) is performed. If the content of the conversion process (805) is “compression”, for example, a process for compressing an attached file included in the message data is performed.

Further, there is a mail control rule in which “NO” is stored in the conversion 805 of the mail control rule table in FIG. 8, which indicates that the conversion process is not performed. That is, if the content of the conversion process defined in association with the mail control rule that matches the data included in the e-mail is “No” in step S405, the conversion process is not performed and the process proceeds to step S406. .

Here, the conversion processing (data encryption, signature (data) addition, data compression) to be processed is an application example of the predetermined processing of the present invention.

  Then, the internal mail server 103 determines the transmission limit size stored in the external memory 211 of the internal mail server 103 in order to determine whether or not it exceeds the limit size of the transmission destination of the message data converted in step S405. A table (limit size table) (FIG. 10) is acquired (step S406).

  If there is no data in the transmission limit size table in step S406, the subsequent processing is executed with the data size of the e-mail acquired in step S401 as the control size. In other words, if there is no data in the transmission limit size table, the subsequent processing is executed using the data size of the e-mail acquired in step S401 stored between steps S4031 and S405 as the control size.

  FIG. 10 is a diagram illustrating an example of the transmission limit size table 342.

  Next, the internal mail server 103 compares the data size of the e-mail after the conversion process in step S405 with the limit size 1003 in the transmission limit size table acquired in step S406, and converts it in step S405. It is determined whether the data size of the e-mail message data after processing exceeds the limit size acquired in step S406 (step S407).

  That is, in step S407, whether or not the data size of the e-mail converted in step S405 is larger than the maximum data size of the received divided mail addressed to the destination, or the maximum data of the divided mail. It is determined whether or not the size is exceeded.

  If the internal mail server 103 determines in step S407 that the e-mail has been exceeded (YES), the e-mail converted in step S405 corresponds to the destination (destination domain) of the e-mail. The mail is divided so as to be equal to or smaller than the limit size (step S408), and the divided mail generated by the division is transmitted to the destination (step S409). Here, the limit size is an application example of the predetermined size of the present invention.

  In step S408, the received e-mail (divided mail) is divided so as to be smaller than the maximum size (maximum data size) or smaller than the maximum size (maximum data size).

  Then, the internal mail server 103 deletes (clears) the data in the transmission limit size table (step S410) and ends the process.

  If it is determined in step S407 that the number does not exceed (NO), the internal mail server 103 proceeds to step S404 and transmits the e-mail to the destination without dividing the e-mail (step S404). The process proceeds to step S410.

  If the internal mail server 103 determines that the e-mail acquired in step S401 is a split mail (step S402: YES), the internal mail server 103 stores the acquired message data (e-mail) as a file in the split mail storage queue. Save (step S411).

  Thereafter, the internal mail server 103 analyzes the divided mail stored and stored in the divided mail storage queue, acquires the file name, the reception date and time, the destination, and the size of the message data of the divided mail, and the “Content-Type” of the header. “:” Field, “divided mail ID” for identifying the divided mail, “NUMBER” indicating the order of the divided mail generated by dividing, and the number of all the divided mails divided from one electronic mail. “TOTAL” is recorded in the division information table 343 (step S412), and the process ends.

  This completes the description of the mail relay process.

  Next, the split mail combination processing unit 322 will be described.

  The split mail combination processing unit 322 shown in FIG. 3 is a process repeatedly executed while sleeping for a predetermined time after the internal mail server 103 is activated.

  Details of the split mail combination processing unit 322 will be described with reference to FIG.

  The processing in each step shown in FIG. 6 is realized by the CPU 201 of the internal mail server 103 loading a program stored in a storage unit such as the external memory 211 into the RAM 203 and executing it.

  FIG. 6 is a flowchart showing details of the split mail combination processing unit 322.

  First, the internal mail server 103 determines whether or not it has slept for a certain period of time (step S601). If it has not slept for a certain period of time (NO in step S601), it sleeps again and returns to step S601.

  If the predetermined time has elapsed in step S601 (YES in step S601), the internal mail server 103 moves the process to step S602.

In step S602, the internal mail server 103 searches the split information table 343 (FIG. 5) for split mails that can be combined.
FIG. 5 is a diagram illustrating an example of the division information table 343.

  As illustrated in FIG. 5, the division information table 343 includes a “file name” that is a file name of a divided mail, a “reception date and time” that is the date and time when the divided mail is received, a “destination” of the divided mail, and the division. “Size” indicating the data size of the mail, “Divided mail ID” for identifying the divided mail, “NUMBER” indicating the division order of the total number of divided mails generated by dividing the electronic mail, one electronic mail It is composed of “TOTAL” which is the number of all the divided mails divided from “TOTAL”.

  Here, the “combinable divided mail” is a divided mail in which the divided mail IDs in the division information table 343 have the same value, and the number of the NUMBER 506 starts from 1 and is arranged in the same number as the TOTAL 507 in order. A set of

  For example, the divided mail ID 505 in FIG. 5 is “F1C4BF.F29D3B0@EXAMPLE”, the divided mail TOTAL 507 is “3”, and the divided mail ID 505 is “F1C4BF.F29D3B0@EXAMPLE”. ”,“ 2 ”,“ 3 ”, and the NUMBER 506 value starts from 1 and is in the same number as the TOTAL 507 value. It indicates that it is possible to split mail.

  In other words, “divided mail that can be combined” indicates that the divided mail in which one electronic mail is divided by the client apparatus 101 is stored in the division information table.

  The internal mail server 103 determines whether or not a split mail that can be combined has been searched (step S603). If it is determined that there is an electronic mail that can be combined (YES), the process proceeds to step S608. On the other hand, if it is determined that there is no email that can be combined (NO), the process proceeds to step S604.

  If the internal mail server 103 determines NO in step S603, the reception date / time 502 is set to the current date / time in order to check whether there is a mail staying without being combined with the long-time divided mail storage queue. The divided mails longer than the predetermined time are identified by searching the divided information table 343 (FIG. 5) (step S604).

  Then, the internal mail server 103 determines whether or not a divided mail whose reception date and time 502 is greater than or equal to a predetermined time from the current date and time has been identified (if there is a divided mail whose reception date and time 502 is greater than or equal to a predetermined time from the current date and time) (step S605) If it is determined that it has been identified (YES), the identified split mail is deleted from the split information table (step S606), and the split mail stored and stored in the split mail storage queue 344 is sent to the destination. (Step S607). Then, the divided mail stored in the divided mail storage queue 344 is deleted (step S612), and the process returns to step S601.

  On the other hand, if it is determined in step S605 that the received date / time 502 cannot be specified (there is no divided mail having a predetermined time or more from the current date / time) (NO), the process returns to step S601.

  If it is determined in step S603 that there is a split mail that can be combined (YES), the internal mail server 103 acquires the combined split mail from the split mail storage queue 344 and combines the split mails. A mail is generated (step S608).

  The internal mail server 103 refers to the division information table 343 (FIG. 5), and the maximum data size (limit size) (maximum size) 1003 among the sizes 504 of the divided mails combined in step S608. Are registered in the transmission limit size table in association with the destination domain 1002 of the transmission destination (destination) (step S609).

  Then, the internal mail server 103 deletes the divided mail records combined in step S608 from the division information table (step S610), and the process proceeds to step S611.

  In step S611, the process of step S402 in FIG. 4 is executed with the electronic mail obtained by combining in step S608 as the processing target. Then, when the processes after step S402 in FIG. 4 are finished, the process proceeds to step S612. In this way, the combined e-mail can be transmitted by executing the processing after step S402.

  As described above, for example, when the divided mail transmitted from the client device 101 is acquired in step S401, the divided mail is stored in the divided mail storage queue in step S411, and in the divided information table in step S412, various types of the divided mail are stored. Store information.

  Then, if it is determined that the split mail that can be combined is received by executing the processing of FIG. 6 (step S603: YES), the split mail is combined (step S608), and the transmission limit size table includes the corresponding mail. Among the data sizes of the divided mails, the maximum data size is registered (step S609), the combined divided mail record is deleted from the division information table (step S610), and the process proceeds to S402 in FIG. .

  In step S402, it is determined that the combined and generated e-mail is not a divided mail (NO), and the e-mail is selected from any of the mail control rules (802, 802) in the mail control rule table 341 (FIG. 8). It is determined whether or not (conditions 803 and 804) are met (corresponding) (step S403).

  Then, when it is determined that they match, by determining whether the transmission control content 806 of the mail control rule determined to match is “send” or “do not send”, the transmission of the email is performed. It is determined whether or not it is permitted (step S4031). If it is determined that the transmission of the e-mail is permitted, the conversion process of the data included in the e-mail is executed (step S405), and the limit size stored in the transmission limit size table is acquired. (Step S406), it is determined whether or not the data size of the converted e-mail exceeds the acquired limit size (Step S407). If it is determined in step S4031 that e-mail transmission is not permitted, the process proceeds to step S410 so that e-mail transmission is not performed.

  If it is determined that the size exceeds the limit size (step S407: YES), the e-mail converted in step S405 is divided so as to be equal to or smaller than the limit size or smaller than the limit size. (Step S408), and the divided mail generated by the division is transmitted to the destination (Step S409).

As described above, according to the present embodiment, the administrator can reduce the registration work to the server of the limit size with respect to the transmission destination, and the transmission destination can be processed without the sender being aware of the processing related to the email in the server. E-mails that do not exceed the limit size can be sent efficiently.

In other words, the sender does not have to be aware of the mail conversion process in the relay processing device, and only sends the divided mail at the transmission destination limit size. It will be possible to send in the right size.

According to the present embodiment, the transmission terminal divides the e-mail into a size that can be accepted by the recipient, and the relay processing device recognizes the necessity of division and the limit size for the transmission destination, The converted e-mail can also be automatically divided and sent so that it is less than the limit size of the destination.

  As a result, the user or administrator can reduce the server administrator's special setting of the division instruction for the converted mail to the server that converts the mail and the division size for each destination.

Conventionally, the data size of the whole email of the email that has been processed such as encryption of data included in the email and addition of data (signature etc.) to the email is the data of the whole email of the email before the processing There is a possibility that an e-mail exceeding the limit size of the transmission destination may be transmitted as a result, but this embodiment can solve this problem.

  In addition, the relay processing device receives the divided mail that has been divided, stores the received divided mail in the storage device of the relay processing device, and the relay processing device generates an electronic mail that is generated by combining the divided mail It is conceivable to perform predetermined processing on the mail, perform the predetermined processing, and relay the divided mail stored in the storage device. However, if such processing is performed, the storage device of the relay processing device is under pressure. In addition, the processing efficiency may be slowed down. The present invention can also solve such a problem by the present embodiment.

The embodiment of the present invention has been described in detail above. However, the present invention can take an embodiment as a system, an apparatus, a method, a program that can be read and executed by a relay processing apparatus, a storage medium, or the like. Specifically, the present invention may be applied to a system composed of a plurality of devices, or may be applied to an apparatus composed of a single device.

Another object of the present invention is to supply a storage medium storing software program codes for realizing the functions of the above-described embodiments to a system or apparatus, and the computer (or CPU or MPU) of the system or apparatus stores the storage medium. Needless to say, this can also be achieved by reading and executing the program code stored in.

In this case, the program code itself read from the storage medium realizes the functions of the above-described embodiments, and the program code itself and the storage medium storing the program code constitute the present invention.

As a storage medium for supplying the program code, for example, a flexible disk, a hard disk, an optical disk, a magneto-optical disk, a CD-ROM, a CD-R, a magnetic tape, a nonvolatile memory card, a ROM, or the like can be used.

Further, by executing the program code read by the computer, not only the functions of the above-described embodiments are realized, but also an OS (basic system or operating system) running on the computer based on the instruction of the program code. Needless to say, a case where the function of the above-described embodiment is realized by performing part or all of the actual processing and the processing is included.

Further, after the program code read from the storage medium is written in a memory provided in a function expansion board inserted into the computer or a function expansion unit connected to the computer, the function is determined based on the instruction of the program code. It goes without saying that the CPU or the like provided in the expansion board or function expansion unit performs part or all of the actual processing and the functions of the above-described embodiments are realized by the processing.

DESCRIPTION OF SYMBOLS 100 Intranet 101-1 Client apparatus 101-2 Client apparatus 102 Client apparatus for administrators 103 Internal mail server 104 Local area network (LAN) 105 Wide area network 106-1 External mail server 106-2 External mail server 106-3 External mail server 111 Mailer 112 WEB browser

Claims (9)

A relay processing device that is communicable with a transmission terminal that transmits a divided mail obtained by dividing an electronic mail, and relays an electronic mail obtained from the divided mail transmitted from the transmission terminal to a destination of the electronic mail,
Obtaining means for obtaining a divided mail transmitted from the transmission terminal;
Combining means for combining the divided mail acquired by the acquiring means;
Processing means for performing a predetermined process on data included in an electronic mail obtained by combining the divided mails with the combining means;
A dividing unit that divides an e-mail including data processed by the processing unit so as to be equal to or smaller than a predetermined size or smaller than a predetermined size;
A transmission means for transmitting the divided mail obtained by dividing the electronic mail by the dividing means to relay;
A relay processing apparatus comprising:   The relay processing apparatus according to claim 1, wherein the predetermined size divided by the dividing unit is a data size of the divided mail acquired by the acquiring unit. It is determined whether to divide the e-mail including the data processed by the processing unit according to the data size of the e-mail including the data processed by the processing unit and the data size of the divided mail received by the receiving unit. A determination unit;
When the determination unit determines that the e-mail including the data processed by the processing unit is to be divided by the determination unit, the e-mail is smaller than the predetermined size or smaller than the predetermined size. The relay processing apparatus according to claim 1, wherein the relay processing apparatus is divided so as to have a size. The determination means is such that the data size of the e-mail including the data processed by the processing means is larger than the data size of the divided mail received by the receiving means, or the data size of the divided mail received by the receiving means By determining whether or not to determine whether to divide an email containing data processed by the processing means,
When the determination unit determines that the e-mail including the data processed by the processing unit is not divided by the determination unit, the transmission unit converts the e-mail including the data processed by the processing unit by the dividing unit. The relay processing apparatus according to claim 3, wherein transmission is performed to relay without performing division processing.   The predetermined process performed by the processing means is a conversion process for converting the file format of the data contained in the e-mail obtained by combining by the combining means to another file format, or adding data to the e-mail 5. The relay processing apparatus according to claim 1, further comprising: an additional process to perform, or a data inspection process for inspecting data included in the e-mail.   The conversion process is a process of converting the file format of the data included in the e-mail to another file format by encrypting the data included in the e-mail obtained by being combined by the combining unit. The relay processing apparatus according to claim 5. Storage means for storing an execution condition indicating a condition for executing the process of the content corresponding to the content of the process performed by the processing means;
Condition determining means for determining whether data included in the e-mail obtained by combining by the combining means matches an execution condition stored in the storage means;
When the condition determining means determines that the data included in the e-mail obtained by being combined by the combining means matches the execution condition stored in the storage means, the execution determined to match Determining means for determining the content of the process stored in the storage means corresponding to a condition as the content of a predetermined process performed by the processing means;
Further comprising
7. The processing unit according to claim 1, wherein the processing unit performs processing of the content determined by the determination unit for data included in an e-mail obtained by being combined by the combining unit. The relay processing device according to claim 1. A control method for a relay processing apparatus that is communicable with a transmission terminal that transmits a divided mail obtained by dividing an electronic mail and relays an electronic mail obtained from the divided mail transmitted from the transmission terminal to a destination of the electronic mail. And
An acquisition step in which the acquisition unit of the relay processing apparatus acquires a divided mail transmitted from the transmission terminal;
A combining step in which the combining means of the relay processing device combines the divided mails acquired in the acquiring step;
A processing step in which processing means of the relay processing device performs a predetermined process on data included in an e-mail obtained by combining the divided mails in the combining step;
A dividing step in which the dividing means of the relay processing device divides an email including the data processed in the processing step so as to be equal to or smaller than a predetermined size or smaller than a predetermined size;
A transmission step in which the transmission means of the relay processing device transmits to relay the divided mail obtained by dividing the electronic mail in the dividing step;
A control method comprising: It is possible to communicate with a transmission terminal that transmits a divided mail obtained by dividing an electronic mail, and can be read and executed by a relay processing device that relays an electronic mail obtained from the divided mail transmitted from the transmission terminal to the destination of the electronic mail. A program,
The relay processing device;
Obtaining means for obtaining a divided mail transmitted from the transmission terminal;
Combining means for combining the divided mail acquired by the acquiring means;
Processing means for performing a predetermined process on data included in an electronic mail obtained by combining the divided mails with the combining means;
A dividing unit that divides an e-mail including data processed by the processing unit so as to be equal to or smaller than a predetermined size or smaller than a predetermined size;
A program that functions as a transmission unit that transmits to relay a divided mail obtained by dividing the electronic mail by the dividing unit.

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