JP2012094112A - Relay processor and control method and program thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce registration work of an administrator to register a limit size for a transmission destination in a server and efficiently transmit an e-mail whose size does not exceed the limit size of the transmission destination without causing a sender to be conscious of processing related to the e-mail in the server.SOLUTION: The relay processor performs processing designated to execute in order to relay an e-mail for data in the e-mail transmitted from a transmission terminal, determines if the e-mail should be divided based on a data size of the e-mail including the processed data and a data size of a divided e-mail transmitted from the transmission terminal to a destination of the e-mail in the past. If it is determined that the e-mail should be divided, the e-mail is divided into pieces whose sizes are equal to or smaller than the data size of the divided e-mail transmitted from the transmission terminal in the past, to be transmitted.

Description

  The present invention relates to a relay processing device, 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.

  Further, in order to send an e-mail safely, for example, it is required to automatically encrypt and send an attached file attached to the e-mail. In addition, it is described that an attached file attached to an electronic mail is encrypted and transmitted.

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.

  Therefore, the object of the present invention is to store the maximum data size of the divided mail transmitted from the transmission terminal, and according to the stored maximum data size and the data size of the email received from the transmission terminal, Determines whether to divide the e-mail, and if it is determined to divide, e-mail is divided and transmitted so that the size is equal to or smaller than the stored maximum data size. As a result, the administrator can reduce the registration work to the server of the limit size for the transmission destination, and the electronic device that does not exceed the limit size of the transmission destination without the sender being aware of the processing related to the e-mail in the server. It is to send mail efficiently.

  The present invention is a relay processing device for relaying an electronic mail transmitted from a transmission terminal to a destination of the electronic mail, the storage unit storing the maximum data size of the divided mail transmitted from the transmission terminal, An acquisition unit that acquires an e-mail transmitted from the transmission terminal, a data size of the e-mail acquired by the acquisition unit, and a maximum of the divided mail transmitted from the transmission terminal stored in the storage unit A determination unit that determines whether to divide the e-mail acquired by the acquisition unit according to a data size; and the determination unit determines that the e-mail acquired by the acquisition unit is to be divided. The mail is stored in the storage means and is equal to or smaller than the maximum data size of the divided mail transmitted from the transmission terminal or smaller than the data size. Dividing means for dividing had to be the size, characterized in that it comprises a transmission means for transmitting to the electronic mail relay division mail obtained by being divided by said dividing means.

  The present invention also includes a storage unit that stores the maximum data size of the divided mail transmitted from the transmission terminal, and controls the relay processing device that relays the electronic mail transmitted from the transmission terminal to the destination of the electronic mail. A method in which the acquisition unit of the relay processing device acquires an e-mail transmitted from the transmission terminal, and the e-mail data acquired by the determination unit of the relay processing device in the acquisition step. A determination step of determining whether to divide the email acquired in the acquisition step according to the size and the maximum data size of the split email transmitted from the transmission terminal stored in the storage means; When the dividing unit of the relay processing device determines that the e-mail acquired in the acquiring step is to be divided by the determining step, the e-mail is stored in the storage A division step of dividing the divided mail so as to be equal to or smaller than the maximum data size of the divided mail transmitted from the transmission terminal, or smaller than the data size, and the transmission means of the relay processing device, And a transmission step of transmitting to relay the divided mail obtained by dividing the electronic mail in the dividing step.

Further, the present invention includes a storage unit that stores the maximum data size of the divided mail transmitted from the transmission terminal, and reads the electronic mail transmitted from the transmission terminal with a relay processing device that relays the electronic mail to the destination of the electronic mail. An executable program that stores the relay processing device in an acquisition unit that acquires an email transmitted from the transmission terminal, a data size of the email acquired by the acquisition unit, and the storage unit A determination unit that determines whether to divide the e-mail acquired by the acquisition unit according to a maximum data size of the divided mail transmitted from the transmission terminal, and the acquisition unit acquires the e-mail acquired by the acquisition unit When it is determined to divide the received e-mail, the e-mail is stored in the storage means and is sent from the transmission terminal. Splitting means for splitting the mail so that it is equal to or smaller than the maximum data size of the mail, and a transmission for relaying the split mail obtained by splitting the electronic mail by the splitting means It is made to function as a means.

  E-mail registration by the administrator to the server of the limit size for the destination is reduced, and the limit size of the destination is not exceeded without the sender being aware of the processing related to the e-mail in the server. E-mail can be transmitted 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. 5 is a flowchart showing details of a mail split transmission process in step S408 of 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. It is a figure which shows an example of the input screen 900 of a transmission restriction size. 6 is a diagram illustrating an example of a transmission limit size table 342. FIG. 6 is a diagram illustrating an example of a division information table 343. FIG. 6 is a flowchart illustrating an example of split mail transmission processing by the client apparatus 101. It is a flowchart which shows an example of the process performed when an electronic mail or a division | segmentation mail is received from a client apparatus (transmission terminal).

  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 files) sent from the local area network 104 to the wide area network 105, and addition of data such as a signature. By performing this, it has a conversion function for converting the e-mail data (text, attached file, etc.) and a data inspection function for inspecting the e-mail data. Further, the internal mail server 103 determines whether or not to relay (send) the e-mail to the destination of the e-mail (whether or not to allow the relay) according to the inspection result of the data included in the e-mail. It has a function. The conversion processing by the conversion function and the data inspection processing by the data inspection function are application examples of the predetermined processing.

  Further, the internal mail server 103 has a function of storing in the storage unit a condition for determining whether or not to perform conversion processing by this conversion function, and a function of registering and changing (updating) the condition. . Here, the condition for determining whether or not to perform the conversion process is information indicating the content of the inspection for performing the inspection process by the data inspection function. Details of this will be described later.

  Further, the internal mail server 103 converts a combined function that combines the size-divided electronic mails (referred to as divided mails) received from the client device 101 and an electronic mail (also simply referred to as mail) combined by the combining function. A function of dividing and transmitting the e-mail converted by the function.

  The internal mail server 103 transmits / receives electronic mail between the client apparatus 101-1 and the client apparatus 101-2, and is an apparatus outside the local area network 104 and the client apparatus 101-1 (in FIG. 1, the external mail server 106). -1, 106-2, 106-3) is a device for managing transmission / reception of an electronic mail to / from the electronic mail, and a process of transmitting the electronic mail toward a transmission destination (email address) set in the electronic mail I do.

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

  The client apparatuses 101-1 and 101-2 are information processing apparatuses (transmission terminals), and have mail client software 111 (hereinafter mailer 111) installed as shown in FIG. Yes. The client apparatuses 101-1 and 101-2 are application examples of the transmission terminal of the present invention.

  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. ). That is, the external mail servers 106-1, 106-2, and 106-3 are connected to a receiving terminal (information processing apparatus) (not shown) that is a destination of the e-mail transmitted from the client apparatuses 101-1, 101-2. It has a function to send e-mail.

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. 11), 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. 11) are stored in the external memory 211 (condition storage means) of the internal mail server 103. The mail storage queue 344 is assigned with the external memory 211 of the internal mail server 103 as an area for storing divided mail.

  The mail control rule setting unit 311 transmits the conditions (702, 703, 704) for converting the e-mail received from the client device, the conversion method (FIGS. 7, 8 to be described later in detail) (705), and the transmission An input of a mail control rule such as the control content 708 is received from the user, and is set (registered, modified, deleted, etc.) in the mail control 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 a condition of a mail address of an e-mail transmission source, a To 703 indicating a condition of a destination mail address, Conditions such as other subject and body of the e-mail and keywords included in the attached file 704, and encrypting and compressing e-mail data (such as the body and attached file) that match these conditions, and adding signature data to the data Control for accepting an input of an item 705 for specifying conversion processing such as e-mail transmission control content 708 that matches these conditions (702, 703, 704) is prepared. Various data input via the input screen 700 are converted into mail control rules. Accepts Te. In addition, it is possible to accept a designation “NO” indicating that conversion processing by the conversion function is not performed in 705.

  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 the mail control rule setting unit 311 of the internal mail server 103 accepts this deletion request, the mail control rule included in the deletion request is deleted 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 subject and body text of the email. Information indicating the content of the conversion process indicating what conversion process is performed on the data included in the e-mail that matches the conditions 804 such as the keyword included in the attached file and the conditions 802, 803, and 804 ( Conversion 805) and transmission control content 806 indicating whether or not to relay (send) an electronic mail that matches the conditions of 802, 803, and 804. Also, in the conversion 805, “No” indicating that the conversion processing is not performed is registered as in the mail control rule whose ID 801 is 5 or 6, for example.

  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, the e-mail address of the e-mail received from the client device is “taro@example.jp”, and “external secret” is used as a keyword in the data included in the e-mail (for example, in an attached file). "" Indicates that the e-mail matches the condition of the mail control rule whose ID is "1". In this case, 805 stipulates that data (for example, an attached file) included in an e-mail that meets these conditions is encrypted. In this case, 806 stipulates that an email including encrypted data (for example, an attached file) is relayed (transmitted) to the destination of the email.

  Also, in 804, as a condition, according to the format of the attached file of the e-mail, the data included in the e-mail is encrypted, the data is compressed, or signature data is added to the data. It is prescribed to do. In this way, it is possible to define what conversion processing is performed on a file according to the file format of the file attached to the e-mail. For example, if the file format is not encrypted, it is possible to set the encryption.

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

  As described above, 802, 803, and 804 shown in FIG. 8 are used as execution conditions for executing the conversion process indicated by the conversion 805 and the transmission control (whether or not to transmit) indicated by the transmission control content 806. It is done.

  Returning to the description of FIG.

  The transmission limit size table registration unit 312 shown in FIG. 3 transfers the domain of the transmission destination and the limit size (details 900A in FIG. 9 and 342 in FIG. 10 to be described later) from the administrator client apparatus 102 to the transmission limit size table. The input is accepted and the setting is registered in the transmission limit size table 342.

  The transmission limit size table registration unit 312 receives an input of the transmission limit size information, so that an input screen 900A of the transmission limit size information as shown in FIG. 9 is displayed on the display device 210 of the administrator client apparatus 102. Information for displaying the screen 900 </ b> A is transmitted to the administrator client device 102. Then, the transmission limit size information is input via the input screen 900A displayed on the administrator client device 102 according to the information, and when the registration button 904A is pressed by the administrator, the administrator client device 102 The input transmission limit size information is transmitted to the internal mail server 103, and the input transmission limit size information is registered in the transmission limit size table 342.

  900A in FIG. 9 is a diagram illustrating an example of an input screen for transmission limit size information displayed on the display device 210 (CRT 210) of the administrator client device 102.

In the input screen 900A shown in FIG. 9, controls for receiving input of items such as an e-mail destination 902A and a limit size 903A are set as transmission limit size information.
Then, the transmission limit size information input via this input screen 900A is registered in the transmission limit size table (A) 342 shown in FIG.

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

  For example, in the transmission limit size information whose ID 1001A is 1, “example3@example.com” is set as the e-mail destination 1002A, and “1024000” is set as the limit size 1003A. In FIG. 10 342, the e-mail address 1002A of the transmission destination is used as the mail transmission destination (destination), but the destination domain may be used.

  Here, the transmission limit size information set and registered by the administrator is used as an initial value. In other words, the transmission limit size information is updated by the processing of step S609, step S6052, and step S1305 described later, and the updated transmission limit size information is used. Further, here, even if the transmission limit size information for all destinations to be transmitted is not registered, the limit size of the new destination domain is registered by the processing in steps S609, S6052, and S1305 described later. .

  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 electronic mail received from the client apparatus 101 is a divided mail, the divided mail is stored and saved in the divided mail saving 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 e-mail is not a divided e-mail, the e-mail relay processing unit 321 determines that the data included in the e-mail matches the e-mail control rule conditions (802, 803, 804) in the e-mail control rule table 341. Judge whether to do.

  Then, conversion processing of data included in the electronic mail is performed according to the mail control rule that matches the condition. When the data size of the e-mail including the converted data exceeds the limit size registered in the transmission limit size table 342, the limit size (data size or less) or less than the limit size (data size) The electronic mail is divided and transmitted so as to be smaller. 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. 12 is a flowchart illustrating an example of split mail transmission processing by the client apparatus 101.

  The processing of each step shown in FIG. 12 is realized by the CPU 201 of the client device 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 apparatus 101 generates an electronic mail by inputting a transmission destination, a mail title, a mail text, attaching a file, etc. in accordance with a user operation instruction (step S1201).

  Then, when the client apparatus 101 receives from the user the transmission instruction for the email generated in step S1201 (step S1202), the data size of the entire email is set to the transmission destination set in the email. It is determined whether or not the corresponding limit size is exceeded (step S1203).

  Here, the destination and the limit size that is the upper limit size of the e-mail to be transmitted to the destination are associated with each other and stored for each destination (the destination domain). By referring to this information, Then, it is determined whether the data size of the e-mail instructed to transmit exceeds the limit size of the transmission destination set in the e-mail.

  If the client apparatus 101 determines that the data size of the e-mail instructed to send exceeds the limit size of the destination set in the e-mail (step S1203: YES), the client apparatus 101 The e-mail is divided so as not to be smaller than or larger than the size (below the limit size) (step S1204).

  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 S1205).

  If the client apparatus 101 determines in step S1203 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 electronic mail is transmitted to the internal mail server 103 in order to transmit it to the set destination (step S1205).

  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 (acquires) an electronic mail transmitted from the client apparatus 101 (step S401). In this embodiment, the e-mail is also called message data.

  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 acquires the acquired message data ( It is determined whether or not (e-mail) matches (corresponds) any of the mail control rules (conditions 802, 803, and 804) in the mail control rule table 341 (FIG. 8) (Step S403) ).

  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 this embodiment, 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 that matches the acquired message data in the mail control rule table 341 (FIG. 8) (YES in step S403), the process proceeds to step S403. On the other hand, if it is determined that there is no mail control rule matching the message data in the mail control rule table 341 (FIG. 8) (NO in step S403), the process proceeds to step S404.

  If it is determined in step S403 that the mail control rule matches the mail control rule (YES), the internal mail server 103 determines whether the transmission control content 806 of the mail control rule determined to match in step S403 is “send”. , It is determined whether it is “not transmitted” (step S4031).

  That is, whether the internal mail server 103 permits relaying (transmission) of the electronic mail determined to match the mail control rule to the destination of the electronic mail (whether the transmission control content 806 is “send”). Then, it is determined whether relaying (transmission) is not permitted (transmission control content 806 is “not transmitting”).

  If the internal mail server 103 determines that relaying (transmission) is permitted to the destination of the e-mail (the transmission control content 806 is “send”) (YES), the process proceeds to step S405. To do. On the other hand, if it is determined that relaying (transmission) is not permitted to the destination of the electronic mail (transmission control content 806 is “not transmitting”) (NO), processing is performed without relaying (transmitting) the electronic mail. Exit.

  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 YES in step S4031, the internal mail server 103 associates the data related to the acquired message data (title, mail text, attached file, etc.) with the mail control rule that matches the message data. The content of the defined conversion process (805 in FIG. 8) is converted (step S405). Here, if the content of the conversion process is “no”, in step S405, the conversion process is not performed on the data included in the e-mail, and the process proceeds to step S406. Here, the conversion process is an application example of the predetermined process of the present invention.

As described above, in the case where the data included in the e-mail is subjected to the data inspection in step S403 and the process proceeds to step S406 without performing the conversion process in step S405, the data acquired in step S401 is obtained in step S407 described later. Whether to divide the acquired electronic mail is determined according to the data size of the electronic mail and the maximum data size of the divided mail transmitted from the transmission terminal stored in FIG. Here, the data size of the e-mail acquired in step S401 is the data size of the e-mail including data after a predetermined process such as a data inspection process is performed.

Next, an example of step S405 will be described.

For example, if the content (805) of the conversion process defined in association with the matching mail conversion rule is “encrypted”, for example, a process of encrypting an attached file included in the acquired message data is performed. If the content of the conversion process (805) is “signature”, a process for adding the signature to the message data (data addition process) 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.

  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. The table (restricted size table) (342 in FIG. 10) is searched to obtain the restricted size of the destination (step S406).

  Here, when a plurality of destinations (transmission destinations) are set in the e-mail, the limit size of each destination address is acquired.

  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 that has been converted in step S405 with the limit size 1003 acquired in step S406, and the electronic mail that has been converted in step S405. It is determined whether the data size of the mail message data exceeds the limit size of at least one destination among the limit sizes 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 divided mail addressed to the transmission destination received in the past, It is determined whether or not the maximum data size is exceeded.

  In step S406, if all the transmission destination limit size data set in the e-mail is not searched in the transmission limit size table, it is determined in step S407 that the limit size is not exceeded ( NO), the electronic mail is transmitted (relayed).

  If it is determined that the internal mail server 103 exceeds in step S407 (YES), the e-mail converted in step S405 is converted into a limit size table corresponding to the destination for each destination of the e-mail. The divided mail is divided so that the size is equal to or smaller than the limit size, or smaller than the limit size, and the divided mail generated by the division is transmitted to the destination (step S408).

  Detailed processing in step S408 will be described with reference to FIG.

  And the internal mail server 103 will complete | finish a process, if the process of step S408 is performed.

  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). finish.

  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 S409).

  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 S410), and the process ends.

  This completes the description of the mail relay process.

  Next, with reference to FIG. 5, the details of the mail split transmission processing in step S408 of FIG. 4 will be described.

  FIG. 5 is a flowchart showing details of the mail split transmission processing in step S408 of FIG.

  The processing of each step shown in FIG. 5 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 individually divides each destination set in the envelope of the e-mail, and generates an e-mail in which one divided destination is set in the envelope for each destination (mail) Dividing means) (step S500).
Next, the internal mail server 103 sets one e-mail as a processing target after each e-mail generated in step S500.

The CPU 201 of the internal mail server 103 repeats the processes of S502 to S508 below for each e-mail address of each destination set in the message data (email) including the data converted in step S405.
In other words, among e-mail destinations generated in step S500, an e-mail set with one destination is set as a processing target (step S501).

  Then, the following steps S502 to S508 are repeated for each e-mail address of each destination set in the message data (e-mail) including the data converted in step S405. That is, the process from step S502 to step S509 is repeated for all the e-mails generated in step S500.

  Then, the internal mail server 103 refers to the transmission limit size table 342 to determine whether or not the limit size of the transmission destination of the processing target electronic mail is currently exceeded, and the electronic mail of the transmission destination of the processing target. A record in which the mail address matches the destination 1002A of the transmission limit size table 342 is searched (step S502).

  Then, the internal mail server 103 determines whether or not the data size of the message data (e-mail) including the data converted in step S405 exceeds the limit size 1003 of the record specified by the search processing in step S502. (Step S503).

  That is, in step S503, whether the data size of the message data (e-mail) including the data converted in step S405 is larger than the limit size 1003A of the record specified in the search processing in step S502, or By determining whether or not the specified record limit size 1003A is exceeded, it is determined whether or not the specified record limit size 1003A is exceeded.

  Next, if it is determined in step S503 that the limit size is exceeded (YES), the internal mail server 103 proceeds to step S505, while the limit size is not exceeded (the destination domain matches in step S502). If the record is not retrieved (NO in step S503), the process proceeds to step S504.

  If NO is determined in step S503, the message data to be currently processed is transmitted (step S504). Thereafter, the process proceeds to step S509.

  If it is determined as YES in step S503, the message data to be currently processed is divided so as to be equal to or smaller than the limit size of the record specified by the search process in step S502 (or smaller than the limit size). Step S505).

Then, each divided mail generated by dividing in step S505 is transmitted (relayed) one by one (step S507). In steps S506 to S508, the process of step S507 is repeatedly executed until all the divided mails are transmitted.
When all the divided mails are transmitted, the process proceeds to step S509.

  In step S509, when the processes from step S502 to step S508 are completed for all the e-mails divided and generated in step S501, the process ends.

  This completes the explanation of the mail split transmission process.

  Returning to the description of FIG.

  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. 11) for split mails that can be combined.
FIG. 11 is a diagram illustrating an example of the division information table 343.

  As shown in FIG. 11, the division information table 343 includes a “file name” that is a name of a divided mail file, 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 1106 starts from 1 and is arranged in the same number as the TOTAL 1107 in order. A set of

  For example, the divided mail ID 1105 in FIG. 11 is “F1C4BF.F29D3B0@EXAMPLE”, the divided mail TOTAL 1107 is “3”, and the divided mail ID 1105 is “F1C4BF.F29D3B0@EXAMPLE”. ”,“ 2 ”,“ 3 ”, and the number of NUMBER 1106 starts from 1 and the same number as the value of TOTAL 1107 in order. 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 and time 1102 is set to the current date and time in order to check whether or not there is a mail staying in the long-division mail storage queue. The divided mails longer than the predetermined time are identified by searching the divided information table 343 (FIG. 11) (step S604).

  Then, the internal mail server 103 determines whether or not a divided mail whose reception date and time 1102 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 1102 is greater than or equal to a predetermined time from the current date and time) (step S605), if it is determined that it can be specified (YES), referring to the transmission limit size table (A) 342, the data size of the divided mail whose reception date and time 1102 has passed a predetermined time or more from the current date and time is the divided mail It is determined whether or not it is larger than the limit size of the destination set in step S6051.

  If the internal mail server 103 determines that the data size of the divided mail is larger than the limit size (YES), the destination limit size 1003A of the transmission limit size table (A) 342 is displayed as the destination. The data size is updated to the maximum data size among the set data sizes of each divided mail (step S6052), and the process proceeds to step S6053.

  If the internal mail server 103 determines in step S6051 that the data size of the divided mail whose received date and time 1102 has passed a predetermined time or more from the current date and time is equal to or smaller than the limit size of the destination set in the divided mail. (NO), the process proceeds to step S6053.

  The internal mail server 103 determines whether or not the processing of step S6051 has been executed for all the destinations set in the divided mail, and if it is determined that the processing is not executed (NO), the next destination Is processed, and the process returns to step S6051.

  If the internal mail server 103 determines that the process of step S6051 has been executed for all destinations set in the divided mail (step S6053: YES), the process proceeds to step S606.

  Next, the internal mail server 103 deletes the divided mail specified in step S605 from the division information table (step S906), and transmits the divided mail stored and stored in the divided mail storage queue 344 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 1102 could not 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).

  Then, the internal mail server 103 determines that each divided mail combined in step S608 is larger than the destination limit size 1003A set in the divided mail combined in step S608 in the transmission limit size table 342 (FIG. 10). It is determined whether or not the maximum data size is larger in each of the sizes 1104 (size determination means) (step S6081).

  Then, in step S6081, the internal mail server 103 has the largest size 1104 of the divided mails combined in step S608, rather than the destination limit size 1003A in the transmission limit size table 342 (FIG. 10). If it is determined that the data size is a larger value (YES), the division information table 343 (FIG. 11) is referred to, and the maximum size among the respective sizes 1104 of the divided mails combined in step S608. The data size (limit size) is updated and registered in the limit size 1003A corresponding to the destination 1002A in the transmission limit size table 342 (step S609), and the process proceeds to step S6091.

  On the other hand, in step S6081, it is determined that the maximum data size among the sizes 1104 of the divided mails combined in step S608 is equal to or smaller than the limit size 1003A of the destination in the transmission limit size table 342 (FIG. 10). If so (NO), the process proceeds to step S6091.

  The internal mail server 103 determines whether or not the processing of step S6091 has been performed for all the destinations set in the split mails combined in step S608 (step S6091), and steps for all the destinations are performed. If it is determined that the process of S6091 has been performed (YES), the process proceeds to step S610. On the other hand, if it is determined that the processing in step S6091 has not been performed for all the destinations (NO), the process returns to step S6081, and the next remaining destination limit size 1003A (transmission limit size table 342 (FIG. It is determined whether or not the maximum data size is larger than the size 1104 of the divided mails combined in step S608 than the limit size 1003A) of the destination in 10) (step S608). S6081).

  Next, the internal mail server 103 deletes the divided mail records combined in step S608 from the divided 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 apparatus 101 is acquired in step S401, the divided mail is stored in the divided mail storage queue in step S409, and in the divided information table, various types of the divided mail are stored in step S410. 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 342 (FIG. 10), the limit size 1003A corresponding to the split mail destination 1002A is updated to the maximum data size among the data sizes of the split mails (step S609), and the combined splits from the split information table are performed. The mail record is deleted (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: YES).

  If it is determined that they match, an e-mail conversion process is executed (step S405), the limit size stored (updated / registered) in the transmission limit size table is acquired (step S406), It is determined whether or not the data size of the converted email exceeds the acquired limit size (step S407).

  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. The divided mail generated by the division is transmitted to the destination (step S408).

When an undivided e-mail is received in step S401, as described with reference to FIG. 4, the limit size 1003A corresponding to the destination 1002A of the received e-mail in the transmission limit size table updated in the past is not more than 1003A. As described above, since the e-mail is divided and transmitted for each destination, the user can reduce the registration work of the administrator to the server of the limit size with respect to the transmission destination and perform processing related to the e-mail in the server. An e-mail having a data size for the transmission destination can be transmitted without the sender being aware of it.

In the above-described embodiment, when the divided mail received from the client device is received, the maximum data size of the divided mail is registered and updated in the transmission limit size table 342 (A). Even when an e-mail that is not a divided mail (an e-mail that has not been divided into sizes) is received from the client device, the data size of the e-mail is registered and updated in the transmission limit size table 342 (A). This will be described with reference to FIG. Specifically, in FIG. 13, the processes of step S <b> 1301, step S <b> 1302, and step S <b> 1303 are added to the process of FIG. 4.

Next, with reference to FIG. 13, processing that is executed each time the CPU 201 of the internal mail server 103 receives an e-mail or a divided mail from the client device (transmission terminal) will be described.

  In the above-described embodiment, the case of receiving an e-mail or a divided mail transmitted from the client apparatus (transmission terminal) in step S401 in FIG. 4 has been described. However, in the following embodiment, in step S401 in FIG. This will be described as a process that is executed each time an e-mail or a divided mail received from a client device (transmission terminal) is received. That is, in the embodiment described below, the process shown in FIG. 13 is executed instead of the process shown in FIG. 4 every time an electronic mail is received from the client apparatus 101.

FIG. 13 is a flowchart illustrating an example of processing by the relay processing unit 321 that is executed each time the CPU 201 of the internal mail server 103 receives an e-mail or a divided mail from a client device (transmission terminal).

  FIG. 13 is the embodiment described above, and the processes of the steps already described are given the same reference numerals. Therefore, a part of the description of the processing of the step in FIG.

  The processing in each step shown in FIG. 13 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 (acquires) an electronic mail transmitted from the client apparatus 101 (step S401).

  Then, 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. Thus, 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 internal mail server 103 moves the process to step S409. The process proceeds to step S1301.
Since the processes in steps S409 and 410 have been described above, a description thereof is omitted here.

  Next, the internal mail server 103 determines that the data size of the e-mail received from the client device, which is not the divided mail, is the limit size in the transmission limit size table 342 (A) for one of the e-mail destinations. It is determined whether it is larger than 1003A (step S1301).

  When the internal mail server 103 determines that the data size of the e-mail received from the client device is larger than the limit size 1003A of the one destination (YES), the internal mail server 103 sets the value of the limit size 1003A of the destination to the client The data is updated and registered in the data size of the email received from the apparatus (step S1302), and the process proceeds to step S1303. On the other hand, if it is determined that the data size of the e-mail received from the client device is a value equal to or smaller than the limit size 1003A of the one destination (NO), the process proceeds to processing step S1303.

The internal mail server 103 determines whether or not the processing in step S1301 has been executed for all destinations set in the email received from the client device (step S1303), and has not yet executed for all destinations. If it is determined that there is not (NO), the process proceeds to step S1301, and the data size of the email received from the client device is determined from the limit size 1003A of the destination with the destination not yet processed as the processing target. Is also larger (step S1301).

On the other hand, if it is determined in step S1303 that the processing in step S1301 has been executed for all destinations set in the e-mail received from the client device (YES), the processing proceeds to step S403. Since the process of step S403 has been described above, a description thereof will be omitted.

As described above, even when an e-mail that is not a divided mail (an e-mail that has not been divided into sizes) is received from the client device, the data size of the e-mail is registered and updated in the transmission limit size table 342 (A). Will be able to.

Further, in the input screen (A) 900A for transmission limit size information in FIG. 9 and the transmission control size table (A) 342 in FIG. 10, the limit size is set for each destination e-mail address. The limit size may be set not only for the mail address but also for each destination domain.

In the above-described embodiment, as shown in the transmission limit size information input screen (A) 900A in FIG. 9 and the transmission control size table (A) 342 in FIG. 10, the limit size is registered for each destination. However, instead of this, as shown in the transmission limit size information input screen (B) 900B in FIG. 9 and the transmission control size table (B) 342B in FIG. 10, the limit size is set for each transmission source. You may make it register.

In this case, the transmission source 902B and the limit size 903B of the e-mail transmitted from the transmission source are input by the user's operation via the input screen (B) 900B of the transmission limitation size information in FIG. When 904A is pressed, the input content is registered in the transmission control size table (B) 342B of FIG.

In step S407, step S507, step S6051, step S6081, and step S1301, the limit size that is determined to be exceeded is the transmission control in FIG. 10 instead of the transmission control size table (A) 342 in FIG. Determination is made using the size table (B) 342B.

That is, the e-mail data size that can be transmitted from the e-mail transmission source is registered in the transmission control size table (B) 342B for each e-mail transmission source, and the received e-mail data size, Compared with the limit size of the e-mail transmission source, if it is determined that the data size of the received e-mail exceeds the limit size of the e-mail transmission source, it is divided and transmitted.

Further, the update of the limit size table in step S6052, step S609, and step S1302 updates the transmission control size table (B) 342B in FIG.

The transmission control size table (B) 342B in FIG. 10 is stored in the external memory of the internal mail server 103, and stores the maximum data size for each transmission source of the divided mail transmitted from the client device.

As described above, in the above-described embodiment, it is configured to determine whether to divide according to the limit size for each destination, but as described here, according to the limit size for each transmission source. It may be determined whether or not to divide.

As described above, according to the present embodiment, the administrator reduces the registration work to the server of the limit size with respect to the transmission destination, and without the sender being aware of the processing related to the email in the server, An e-mail that does not exceed the limit size of the destination can be efficiently transmitted.

In addition, by dividing the e-mail for each destination according to the limit size for each destination determined according to the size of the e-mail for each destination transmitted in the past, a server of the limit size for the destination by the administrator It is possible to provide a mechanism for sending an e-mail having a data size to a transmission destination without the sender being aware of the process related to the e-mail in the relay processing apparatus.

  Further, according to the present invention, the mail sender does not convert the mail before the conversion without specially setting the division instruction for the mail after conversion in the server that performs the mail conversion and the division size for each transmission destination. The limit size information for each destination can be stored and managed simply by sending the e-mail by the normal division method.

In addition, the sender is not aware of the mail conversion process in the relay processing device, and only sends the divided mail at the limit size of the transmission destination. 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.

The embodiment of the present invention has been described in detail above. However, the present invention can take an embodiment as, for example, a system, apparatus, method, program executable by the apparatus, or a storage medium. 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 (14)

A relay processing device that relays an email transmitted from a transmission terminal to a destination of the email,
Storage means for storing the maximum data size of the divided mail transmitted from the transmission terminal;
Obtaining means for obtaining an e-mail transmitted from the sending terminal;
According to the data size of the e-mail acquired by the acquiring unit and the maximum data size of the divided mail transmitted from the transmitting terminal stored in the storage unit, the e-mail acquired by the acquiring unit is Determining means for determining whether to divide;
When it is determined by the determination means that the electronic mail acquired by the acquisition means is to be divided, the electronic mail is stored in the storage means, and the maximum data of the divided mail transmitted from the transmission terminal A dividing means for dividing the data so as to be smaller than the data size or smaller than the data 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 storage means further stores the destination of the divided mail transmitted from the transmission terminal in association with the maximum data size of the divided mail,
The determination unit is acquired by the acquisition unit according to the data size of the email acquired by the acquisition unit and the maximum data size stored in the storage unit in association with the destination of the email Decide whether to split the email,
When the determination unit determines that the e-mail acquired by the acquisition unit is to be divided by the determination unit, the e-mail is stored in the storage unit in association with the destination of the e-mail The relay processing apparatus according to claim 1, wherein the relay processing device is divided so as to be equal to or smaller than the maximum data size or smaller than the data size. The acquisition means further acquires a divided mail transmitted from the transmission terminal,
Update means for updating the data size stored in the storage means in association with the destination of the divided mail acquired by the acquisition means to the maximum data size of the divided mail acquired by the acquisition means; The relay processing device according to claim 2. Size determining means for determining whether the data size of the divided mail acquired by the acquiring means is larger than the maximum data size associated with the destination of the divided mail and stored in the storage means. ,
The update means is the size determination means, and the data size of the divided mail acquired by the acquisition means is larger than the maximum data size stored in the storage means in association with the destination of the divided mail. When it is determined, the data size associated with the destination of the divided mail and stored in the storage unit is updated to the maximum data size of the divided mail acquired by the acquisition unit. Item 4. The relay processing device according to Item 3. Processing means for performing predetermined processing on the data included in the e-mail acquired by the acquisition means;
The determination means is the processing means according to the data size of the email including the data processed by the processing means and the maximum data size stored in the storage means in association with the destination of the email. Determine whether to split the email containing the processed data,
The dividing unit stores the e-mail in the storage unit in association with the destination of the e-mail when the determining unit determines to divide the e-mail including the data processed by the processing unit. 5. The relay processing device according to claim 1, wherein the relay processing apparatus divides the data so that the data size is equal to or smaller than the maximum data size. The acquisition unit acquires an email in which a plurality of destinations are set,
A mail splitting unit for splitting a plurality of destinations set in the email acquired by the acquisition unit into individual destinations;
The determination unit is further configured according to a data size of an email including the data processed by the processing unit and a data size stored in the storage unit and associated with the destination divided by the mail division unit. Determining whether to divide an email containing data processed by the processing means for each destination divided by the mail dividing means,
The dividing unit is configured so that the destination e-mail determined to be divided by the determining unit is equal to or smaller than the maximum data size stored in the storage unit in association with the destination or smaller than the data size. The relay processing device according to claim 5, wherein the relay processing device is divided into two.   The predetermined process performed by the processing means is a conversion process for converting the file format of the data included in the email acquired by the acquisition means to another file format, or an additional process for adding data to the email, The relay processing apparatus according to claim 5, further comprising: a data inspection process for inspecting data included in the e-mail.   The conversion process is a process of converting a file format of data included in the e-mail to another file format by encrypting data included in the e-mail acquired by the acquisition unit. The relay processing device according to claim 7. Corresponding to the content of the processing performed by the processing means, condition storage means for storing an execution condition indicating a condition for executing the processing of the content;
Condition determination means for determining whether data included in the e-mail acquired by the acquisition means matches an execution condition stored in the condition storage means;
When the condition determining means determines that the data included in the e-mail acquired by the acquiring means matches the execution condition stored in the condition storage means, it corresponds to the execution condition determined to match Determining means for determining the content of the processing stored in the condition storage means as the content of the predetermined processing performed by the processing means;
Further comprising
9. The processing apparatus according to claim 3, wherein the processing unit performs processing of the content determined by the determination unit on data included in an electronic mail acquired by the acquisition unit. The relay processing apparatus described.   Whether or not the data size of the email including the data processed by the processing unit is larger than the maximum data size stored in the storage unit in association with the destination of the email; Or whether to divide an e-mail containing data processed by the processing means by determining whether or not it is greater than or equal to the maximum data size stored in the storage means in association with the destination of the e-mail The relay processing device according to claim 3, wherein it is determined whether or not. Further comprising combining means for combining the divided mails acquired by the acquiring means;
The said processing means performs the said predetermined | prescribed process with respect to the data contained in the electronic mail obtained by combining by the said combination means, The Claim 1 characterized by the above-mentioned. Relay processing device. The transmitting terminal is an arbitrary transmitting terminal,
12. The relay processing apparatus according to claim 1, wherein the storage unit stores a maximum data size for each transmission source of the divided mail transmitted from the transmission terminal. A control method for a relay processing apparatus comprising a storage unit for storing a maximum data size of a divided mail transmitted from a transmission terminal, and relaying an electronic mail transmitted from the transmission terminal to a destination of the electronic mail,
An acquisition step in which the acquisition unit of the relay processing apparatus acquires an email transmitted from the transmission terminal;
The determination unit of the relay processing device, according to the data size of the e-mail acquired in the acquisition step, and the maximum data size of the divided mail transmitted from the transmission terminal stored in the storage unit, A determination step of determining whether to divide the e-mail acquired in the acquisition step;
When the dividing unit of the relay processing apparatus determines that the e-mail acquired in the acquiring step is to be divided by the determining step, the e-mail is stored in the storage unit from the transmitting terminal. A dividing step of dividing the divided mail so as to be equal to or smaller than the maximum data size of the transmitted divided mail, or smaller than the data 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 for a relay processing apparatus, comprising: A program comprising storage means for storing the maximum data size of the divided mail transmitted from the transmission terminal, and capable of being read and executed by a relay processing device that relays the electronic mail transmitted from the transmission terminal to the destination of the electronic mail. And
The relay processing device;
Obtaining means for obtaining an e-mail transmitted from the sending terminal;
According to the data size of the e-mail acquired by the acquiring unit and the maximum data size of the divided mail transmitted from the transmitting terminal stored in the storage unit, the e-mail acquired by the acquiring unit is Determining means for determining whether to divide;
When it is determined by the determination means that the electronic mail acquired by the acquisition means is to be divided, the electronic mail is stored in the storage means, and the maximum data of the divided mail transmitted from the transmission terminal A dividing means for dividing the data so as to be smaller than the data size or smaller than the data 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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