JP2012160153A - Mail terminal device, message acquisition method, message transmission method and mail client program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mail terminal device, a message acquisition method, a message transmission method and a mail client program which prevent RAM from becoming insufficient and operation of a program from being unstable, when receiving/transmitting a message which is large in size.SOLUTION: A mail terminal device comprises volatile memory having a buffer of a prescribed size, writable non-volatile memory and a processing part. The processing part acquires a message by repeating a step to receive data of the message by fixed length to the buffer and a step to sequentially store the data received by the fixed length in a file on the non-volatile memory.

Description

  The present invention relates to a mail terminal device, a message acquisition method, a message transmission method, and a mail client program.

  E-mail is widely used as a method for exchanging messages using a computer network. In addition, mobile phone terminals provide services for exchanging messages such as SMS (Short Message Service) and MMS (Multimedia Messaging Service) using a signaling channel between contract terminals of the same business operator, and the mobile phone terminal and the Internet. Exchange of electronic mail is also widely performed with computers connected to the Internet or contract terminals of other communication carriers.

  E-mails that have been operated by individual communication methods (protocols) in individual local networks are spread on the TCP / IP network as the Internet spreads, so that SMTP (Send Mail Transfer Protocol), POP (Post Office Protocol), It is operated by a common protocol defined by RFC, such as IMAP (Internet Message Access Protocol) and MIME (Multipurpose Internet Mail Extensions).

  The e-mail of mobile phone terminals is basically operated according to the same protocol, but has been expanded and modified in order to support networks and services provided by mobile carriers. In some cases.

Japanese Patent Laid-Open No. 1997-261344

  In order to realize creation, transmission / reception, browsing and management of messages on a mobile phone terminal, it is necessary to execute a MUA (Mail User Agent) program (may be referred to as a mailer or mail client) on the mobile phone terminal. . However, mobile phone terminals are limited in processing capacity and memory capacity compared to personal computers, server computers, and the like, and have different memory configurations. For this reason, in a mail client for a mobile phone terminal, a problem specific to the mobile phone terminal may occur.

  For example, the amount of RAM mounted in a built-in device such as a mobile phone is limited, but the capacity of a message transmitted and received as an e-mail may reach several megabytes. For this reason, if the message received by the mail client program used in the mobile phone terminal is stored on the RAM, when the large message is received, the RAM is occupied by the message and the memory becomes insufficient. There is a problem that operation becomes unstable. Such a problem can also occur when a message having a large size is transmitted in a configuration in which the message to be transmitted is held on the RAM.

  Therefore, the present invention provides a mail terminal device, a message acquisition method, a message transmission method, and a mail client program that do not run out of RAM when receiving / transmitting a large message and the operation of the program does not become unstable. Objective.

In order to solve the above problems, a first aspect of the present invention is a volatile memory having a buffer of a predetermined size;
Writable non-volatile memory;
In a mail terminal device comprising a processing unit,
The processing unit obtains a message by repeating a step of receiving message data in the buffer in a fixed length and a step of sequentially storing the data received in a fixed length in a file on a nonvolatile memory. A mail terminal device is provided.

  In the above configuration, when the size of the message to be received is equal to or smaller than a predetermined value, the processing unit receives the message data in a fixed length in the buffer, and the received data in the fixed length is a volatile memory. It is desirable to obtain a message by repeating the step of sequentially storing in the upper object.

A second aspect of the present invention is a volatile memory having a buffer of a predetermined size;
Writable non-volatile memory;
In a mail terminal device comprising a processing unit,
The processing unit repeats the steps of storing the created message data in a file on the nonvolatile memory and reading the data from the file in fixed lengths, storing the data in the buffer, and sequentially transmitting the data. Is provided. The mail terminal device characterized by transmitting.

  In the above configuration, when the size of the created message is equal to or smaller than a predetermined value, the processing unit holds the message data on the volatile memory and fixes the data held on the volatile memory. It is desirable that the message is transmitted by repeating the step of storing data in the buffer for each length and sequentially transmitting data.

Furthermore, a third aspect of the present invention is a method for acquiring a message in a mail terminal device including a volatile memory having a buffer of a predetermined size, a writable nonvolatile memory, and a processing unit.
A message obtaining method comprising: obtaining a message by repeating a step of receiving message data into the buffer in fixed length and a step of sequentially storing the data received in fixed length in a file on a nonvolatile memory I will provide a.

  Even in the above configuration, when the size of the message to be received is equal to or smaller than the predetermined value, the step of receiving the message data in the buffer at a fixed length and the data received at the fixed length in the object on the volatile memory are sequentially performed. It is desirable to obtain a message by repeating the storing step.

Furthermore, a fourth configuration of the present invention is a method for transmitting a message with a mail terminal device including a volatile memory having a buffer of a predetermined size, a writable nonvolatile memory, and a processing unit.
Transmitting the message by repeating the steps of storing the created message data in a file on the non-volatile memory and reading the data from the file in fixed lengths, storing the data in the buffer and sequentially transmitting the data. A characteristic mail transmission method is provided.

  Even in the above configuration, when the size of the created message is equal to or smaller than the predetermined value, the step of holding the message data on the volatile memory and the data held on the volatile memory in the buffer by a fixed length. It is desirable that the message is transmitted by repeating the step of storing and sequentially transmitting data.

Furthermore, according to a fifth aspect of the present invention, in a mail client program executed by a mail terminal device including a volatile memory having a buffer of a predetermined size, a writable nonvolatile memory, and a processing unit,
When executed by the processing device, the message is obtained by repeating the steps of receiving the message data in the buffer in fixed lengths and sequentially storing the received data in the fixed length in a file on the nonvolatile memory. Provided is a mail client program characterized by realizing the processing to be performed.

When the size of the message to be received is smaller than or equal to a predetermined value by being executed by the processing device, the message data is received in the buffer by a fixed length, and the data received by the fixed length is volatile memory It is desirable to realize a process of acquiring a message by repeating the step of sequentially storing in the upper object.

Furthermore, in a sixth aspect of the present invention, in a mail client program executed by a mail terminal device including a volatile memory having a buffer of a predetermined size, a writable nonvolatile memory, and a processing unit,
A step of storing the created message data in a file on a non-volatile memory by being executed by the processing device; a step of reading the data from the file in fixed lengths and storing the data in the buffer; and sequentially transmitting the data; A mail client program characterized by repeatedly transmitting a message is provided.

  Even in the above configuration, when the size of the created message is equal to or smaller than a predetermined value by being executed by the processing device, the message data is stored on the volatile memory, and the message data is stored on the volatile memory. It is desirable to realize a process of transmitting a message by repeatedly storing the received data in the buffer for each fixed length and sequentially transmitting the data.

  The mail terminal device, the message acquisition method, and the mail client program of the present invention include a step of receiving message data in the buffer in fixed lengths, and a step of sequentially storing the received data in fixed lengths in a file on a nonvolatile memory. Are repeated to acquire the message, so that the received message is not placed on the volatile memory (RAM). Therefore, even if a large message is received, the mail terminal device does not run out of RAM and the operation of the program does not become unstable.

  The mail terminal device, the message transmission method, and the mail client program of the present invention include a step of storing the created message data in a file on the nonvolatile memory, and reading the data from the file by a fixed length and storing the data in the buffer. Then, since the message is transmitted by repeating the step of sequentially transmitting data, the message to be transmitted is not placed on the volatile memory (RAM). Therefore, when sending a large message, the mail terminal device does not run out of RAM, and the operation of the program does not become unstable.

  It is a hardware block diagram of the communication terminal device concerning one Embodiment of this invention.   It is a software block diagram of the communication terminal device concerning one Embodiment of this invention.   It is a block diagram of the mail client program concerning one Embodiment of this invention.   (A) is drawing which shows the data structure example of an email message, (b) is drawing which shows another data structure example.   It is a flowchart of a message acquisition operation.   It is a flowchart of a message transmission operation.

Embodiments of a mail receiving method, a mail terminal device, and a mail client program according to the present invention will be described below. FIG. 1 is a hardware block diagram of a communication terminal device 100 which is an embodiment of a mail terminal device according to the present invention. This figure shows a standard hardware configuration, and some of the functional blocks are also shown that are not related to the present invention. As shown in FIG. 1, this communication terminal device 100 mainly includes an application processor 101 and a baseband processor 102 as processing devices, a battery 103 connected to the application processor 101, a RAM 104 as volatile memory, and a writable memory. Flash memory 105 which is a nonvolatile memory, memory card terminal 106, GPS transceiver 108, WiFi / Bluetooth transceiver 109, keypad / button 110, LCD / touch panel 111, microphone 112, speaker 113, USB terminal 114 and camera 115, base A transceiver / USIM 107 connected to the band processor 102 is included.
Hereinafter, these configurations will be described.

  The application processor 101 is an MPU or CPU, and is a unit that implements various functions by receiving power supplied from the battery 103 and executing a program stored in a flash memory 105 described later. The baseband processor 102 is a processor that performs signal processing for realizing basic functions of wireless communication. The application processor 101 and the baseband processor 102 may be configured as one chip set, or the functions of both may be integrated into one processor.

  The battery 103 is a unit that supplies power to each functional block, and a controller chip that controls the battery is used in combination as necessary.

  The RAM 104 is a volatile memory and employs a semiconductor storage device such as SRAM, PSRAM, and various DRAMs. The flash memory 105 is a rewritable nonvolatile memory, and may be a NAND type, a NOR type, or another type. Comparing the RAM 104 and the flash memory 105, the RAM 104 is faster in both reading time and writing time. In addition, the communication terminal device 100 is provided with a memory card terminal 106, and a small flash memory module can be connected as an external memory.

  The flash memory 105 stores various programs and data for realizing predetermined functions in the communication terminal device 100 by being executed by the application processor 101 and the baseband processor 102. These programs and / or data are loaded into the RAM 104 as necessary, and are executed using a heap memory secured on the RAM 104.

  The transceiver / USIM 107 is connected to the baseband processor 102, and transmits / receives radio waves in a predetermined radio wave band under the control of the baseband processor 102 based on information of the installed USIM (Universal Subscriber Identity Module), that is, a general-purpose subscriber identification module. This is a circuit that performs communication. The communication terminal device 100 according to the present embodiment is configured to perform communication by connecting to a mobile communication network using a baseband processor 102 and a transceiver / USIM 107.

  The GPS transceiver 108 is a unit for receiving a GPS signal for acquiring position information of the communication terminal device 100. The WiFi / Bluetooth transceiver 109 is defined by IEEE802.11a, IEEE802.11b, IEEE802.11g, IEEE802.11n, and the like. This is a circuit for performing communication using the established WiFi (wireless LAN) technology and communication using the Bluetooth technology defined by IEEE 802.15.1 and the Bluetooth standard. These circuits may be mounted as chips independent of each other, or a configuration in which both circuits are mounted on one chip may be used.

  The keypad / button 110 is an input device provided in the housing of the communication terminal device 100 and accepts an input for the user to operate the communication terminal device 100 together with an LCD / touch panel 111 described later.

  The LCD / touch panel 111 is a liquid crystal display device having a touch panel function, and the communication terminal device 100 displays application information on the screen of the LCD / touch panel 111 and displays a GUI (Graphical User Interface). To serve.

  Furthermore, the microphone 112 and the speaker 113 realize voice input / output in the communication terminal apparatus 100, and the USB 114 is used to connect the communication terminal apparatus 100 to another device to transmit / receive data and control functions. The In addition, the camera 115 provides a function of taking a picture with the communication terminal device 100.

Next, an outline of the configuration of the program stored in the flash memory 105 of the communication terminal device 100 configured as described above will be described. FIG. 2 is a diagram showing an overall program configuration of the communication terminal apparatus 100.
As shown in FIG. 2, the program configuration of the communication terminal device 100 is mainly composed of three layers of an operating system 200, middleware 202, and application 207. These programs are stored in the flash memory 105, and implement various functions by being executed by the application processor 101 and / or the baseband processor 102 using the RAM 104 as necessary.

  The operating system 200 includes a device driver 201 for controlling hardware, and provides basic functions as a computer system such as input / output control, memory management, and process management to the middleware 202 and the application 207. .

  The middleware 202 is represented by, for example, a graphic library 203 that performs graphic processing, an HTML rendering engine 204 that performs rendering processing of HTML files, a database management system 205 that provides a database API for managing a database, and Iibc in a Unix-based OS. The standard library 206 is included, and general-purpose functions used by the application 207 are provided. Here, when the communication terminal 100 executes a program that requires an execution environment such as a Java (registered trademark) application, the execution environment is mounted as the middleware 202.

  The application 207 includes a browser 208 that acquires a Web page and displays a screen created by the HTML rendering engine 204, a mail client program 209, which will be described later, a telephone application 210 that provides a telephone function, and the like. It provides various functions.

Hereinafter, the mail client program 209 will be described.
FIG. 3 shows a software block diagram of the mail client program 209 together with various data. As shown in FIG. 3, the mail client program 209 mainly includes a menu display unit 221, an account setting management unit 222, an address management unit 223, and a message management unit 227. The various data includes account information 241 managed by the database management system 205, an address data part 242, a mail box 243, and a message storage part 244.

  The folder list display unit 221 is a block that forms a screen that is displayed after activation, and displays a list of folders that have been set for the mailbox of the account that is set as a default for selection by the user. A UI for calling account switching, setting, mail creation, and address book display functions is also displayed on the screen.

  The account setting management unit 222 is called by operating the account switching UI or the setting UI from the screen formed by the folder list display unit display unit 221, and displays the account list to switch the account to the one selected by the user. Provide functions and account settings. User account information set and managed by the account management unit 222 is stored in the account information unit 241 managed by the database management system 205.

  The address management unit 223 is called by operating the UI for address book display from the screen formed by the folder list display unit display unit 221, and displays an address list display unit 224 that displays a list of registered addresses. An address individual display unit 225 for individually displaying on a screen and an address addition / modification unit 226 for adding an address and modifying a registered address are provided, and processing for using and managing data registered in the address book is performed. The address book data managed by the address management unit 223 is stored in the address data unit 242 managed by the database management system 205.

  The message management unit 227 displays a message (refers to individual emails created or transmitted / received by the email client program 209) and allows the user to browse, a message creation / editing unit 229 that creates and edits a new message, A message transmission unit 230 that connects to a server and transmits a message, and a message reception unit 231 that connects to a mail server and receives a message are provided to create and transmit a new mail, and receive a new mail. Manage and display on the screen.

  The reception buffer 232 is an area on the RAM 104 that is used by the message receiving unit 231 to acquire message data from a mail server connected via the mobile communication network. A transmission buffer 233 is an area on the RAM 104 used by the message transmission unit 230 to transmit message data to a mail server connected via the mobile communication network. The reception buffer 232 and the transmission buffer 233 are also fixed-length buffers.

  Hereinafter, the data format of messages and mailboxes managed by the message management unit 227 will be described. A message transmitted and received by the mail client program 209 takes a standard data format as an electronic mail, and its structure is as shown in FIGS. 4 (a) and 4 (b). FIG. 4A shows the data structure of a text mail without an attached file, and the message in this case has a structure in which header information and body information consisting of a body are separated by a blank line. On the other hand, FIG. 4B shows the data structure of a multipart mail to which a file is attached. In this case, the message has empty header information and body information consisting of a body part and an attached file part. The structure is separated by lines.

  From such a message, the message management unit 227 receives a reception type indicating whether the received form is any one of (TO, CC, BCC), Uid, title, reception date, transmission date, transmission source, reply destination, Extracting or judging body information, content format, MIME type, etc., and further providing a message object with a database name storing the message, an ID used as a primary key of the database, a utility flag, a folder name, a read flag, etc. Manage the message object. Further, the database management system 205 is used to store message objects in the mailbox 243 and manage them as a database.

  Hereinafter, various data used by the mail client program 209 will be described. The account information unit 241 is a database that stores account information for logging in to a mail server used for message transmission / reception, and is provided on the flash memory 105. The account information includes a mail address used for mail transmission / reception, and is associated with one of the mail boxes described later.

  The address data unit 242 is a database that stores information of a partner that transmits and receives messages, and is provided on the flash memory 105. The address data part 242 includes the name of the other party, the mail address, and the like.

  The mail box 243 is a database that stores messages transmitted / received and created for each account, and is provided on the flash memory 105. The mail box 243 is read by the message display unit 228 and the message creation / editing unit 229 of the message management unit 227, and the message received by the message reception unit 231 and the message transmitted by the message transmission unit 230 are additionally registered.

  The message storage unit 244 is provided on the flash memory 105, and stores the message data received by the reception buffer 232 in a predetermined case, and uses the message creation / editing unit 229 in a predetermined case. Stores the message data created by.

  Hereinafter, the operation of the mail client program 209 will be described with reference to the drawings. FIG. 5 is a flowchart showing an operation of acquiring a message by the mail client program 209, and FIG. 6 is a flowchart showing an operation of transmitting the message.

  As shown in FIG. 5, in the operation of acquiring a message, the mail client program 209 is activated, and the user instructs to receive a new mail by operating a GUI (Graphical User Interface) displayed on the LCD / touch panel 111. Is started (ST101). First, the mail client program 209 logs in to the mail server based on the account information recorded in the account information unit 241 (ST102), and acquires information on the number and size of new mail from the mail server (ST103).

  Subsequently, the mail client program 209 determines whether there is a new mail from the information acquired from the mail server (ST104). If there is a new mail, the total size of the new mail is a predetermined value (for example, 1 MB) or more. Is determined (ST105).

  If it is determined in ST105 that the value is equal to or greater than the predetermined value, a process of acquiring new mail via the reception buffer 232 and storing it in the message storage unit 244 is executed (ST106). More specifically, for example, new messages stored in the mailbox of the mail server are received by the reception buffer 232 in a predetermined length in a predetermined order (for example, the order of arrival at the mail server), and the received data of the predetermined length is received. A new message can be acquired by repeating the process of storing in the message storage unit 244. At this time, it is desirable to make the data of the new message one file at a time.

  On the other hand, if it is not determined in ST105 that the value is greater than or equal to the predetermined value, a process of acquiring new mail via the reception buffer 232 and holding it on the RAM 104 is executed (ST107). More specifically, for example, new messages stored in the mailbox of the mail server are received by the reception buffer 232 in a predetermined length in a predetermined order (for example, the order of arrival at the mail server), and the received data of the predetermined length is received. A new message can be acquired by repeating the process of arranging the message object on the RAM 104.

  After the process of ST106 or ST107 is completed and when it is determined that there is no new message in ST104, the mail server is logged off (ST108), and the series of processes is terminated.

  In addition, as shown in FIG. 6, in the operation of sending a message, the user creates a message using a GUI (Graphical User Interface) displayed on the LCD / touch panel 111 while the mail client program 209 is activated. This starts from (ST201). First, the mail client program 209 determines whether the size of the message created by the user is greater than or equal to a predetermined value (eg, 1 Mbyte) (ST202). If it is determined that the size is greater than or equal to the predetermined value, the message storage unit 244 (ST203). On the other hand, if it is not determined in ST202 that the value is greater than or equal to the predetermined value, the created message is held on the RAM 104 (ST204).

  Thereafter, the user operates the GUI (Graphical User Interface) displayed on the LCD / touch panel 111 to instruct mail transmission (ST205), and then the mail client program 209 logs in to the mail server (ST206) and creates it. The read message is read from the message storage unit 244 or the RAM 104 by a predetermined length and stored in the transmission buffer, thereby transmitting the message to the mail server (ST207). Finally, log off from the mail server (ST208) and end the series of processing.

  According to the operation of acquiring the message, when the total size of the new arrival message is larger than a predetermined value, the acquired message is stored in the message storage unit 244 of the flash memory 105 without being stored in the RAM 104. It is possible to prevent a message from becoming insufficient due to a message and causing the program operation to become unstable. On the other hand, when the total size of newly arrived messages is less than the predetermined value, the acquired message is held on the RAM 104, so that the disadvantage of using the low-speed flash memory 105 can be suppressed.

  Further, according to the operation of transmitting the message, when the total size of the created message is larger than a predetermined value, the acquired message is stored in the message storage unit 244 of the flash memory 105 without being held on the RAM 104. Therefore, it is possible to prevent the created message from running out of memory and causing the program operation to become unstable. On the other hand, when the size of the created message is less than the predetermined value, the disadvantage of holding the message on the RAM 104 and using the high-speed flash memory 105 can be suppressed.

  The present invention is not limited to the above embodiment, and various modifications can be made. For example, in the above-described embodiment, the case where the new message is stored in the flash memory 105 only when the size of the new message is equal to or larger than the predetermined value and the size of the created message is equal to or larger than the predetermined value is shown. All acquired messages and created messages may be stored in the flash memory 105. In this case, although the frequency of using the low-speed flash memory 105 increases, it is possible to reduce the condition determination overhead regarding the message storage destination.

  In the above embodiment, the case where it is determined whether the size is equal to or larger than the predetermined value after the message is generated has been described. However, such a determination may be performed during the message generation or in parallel with the operation for generating the message. It may be performed automatically.

104 RAM
105 Flash memory 205 Database management system 221 Folder list display unit 223 Address management unit 224 Address list display unit 225 Address individual display unit 226 Address addition modification unit 227 Message management unit 228 Message display unit 229 Message creation / editing unit 230 Message transmission unit 231 Message Reception unit 232 Reception buffer 233 Transmission buffer 234 Cache management unit 241 Account information unit 242 Address data unit 243 Mailbox 244 Message storage unit

Claims (12)

A volatile memory having a buffer of a predetermined size;
Writable non-volatile memory;
In a mail terminal device comprising a processing unit,
The processing unit obtains a message by repeating a step of receiving message data in the buffer in a fixed length and a step of sequentially storing the data received in a fixed length in a file on a nonvolatile memory. A mail terminal device.   When the size of the message to be received is equal to or smaller than a predetermined value, the processing unit receives the message data in a fixed length in the buffer, and sequentially receives the data received in the fixed length in an object on a volatile memory. The mail terminal apparatus according to claim 1, wherein the message is obtained by repeating the storing step. A volatile memory having a buffer of a predetermined size;
Writable non-volatile memory;
In a mail terminal device comprising a processing unit,
The processing unit repeats the steps of storing the created message data in a file on the nonvolatile memory and reading the data from the file in fixed lengths, storing the data in the buffer, and sequentially transmitting the data. The mail terminal device characterized by transmitting.   When the size of the created message is equal to or smaller than a predetermined value, the processing unit stores the message data on the volatile memory, and stores the data held on the volatile memory in the buffer by a fixed length. 4. The mail terminal device according to claim 3, wherein the message is transmitted by repeating the step of storing and sequentially transmitting data. In a method of acquiring a message with a mail terminal device including a volatile memory having a buffer of a predetermined size, a writable nonvolatile memory, and a processing unit,
A message obtaining method comprising: obtaining a message by repeating a step of receiving message data into the buffer in fixed length and a step of sequentially storing the data received in fixed length in a file on a nonvolatile memory .   If the size of the message to be received is less than or equal to a predetermined value, receiving the message data in a fixed length in the buffer, and sequentially storing the received data in the fixed length in an object on a volatile memory. 6. The mail acquisition method according to claim 5, wherein the message is repeatedly acquired. In a method of transmitting a message by a mail terminal device including a volatile memory having a buffer of a predetermined size, a writable nonvolatile memory, and a processing unit,
Transmitting the message by repeating the steps of storing the created message data in a file on the non-volatile memory and reading the data from the file in fixed lengths, storing the data in the buffer and sequentially transmitting the data. E-mail transmission method characterized.   If the size of the generated message is less than or equal to a predetermined value, the step of holding the message data on the volatile memory, and the data held on the volatile memory are stored in the buffer in fixed length increments and sequentially 8. The mail transmission method according to claim 7, wherein the message is transmitted by repeating the step of transmitting. In a mail client program executed by a mail terminal device having a volatile memory having a buffer of a predetermined size, a writable nonvolatile memory, and a processing unit,
When executed by the processing device, the message is obtained by repeating the steps of receiving the message data in the buffer in fixed lengths and sequentially storing the received data in the fixed length in a file on the nonvolatile memory. A mail client program characterized by realizing processing to be performed.   When the size of the message to be received is smaller than or equal to a predetermined value by being executed by the processing device, the message data is received in the buffer by a fixed length, and the data received by the fixed length is volatile memory The mail client program according to claim 9, wherein a process of acquiring a message by repeating the step of sequentially storing in the upper object is realized. In a mail client program executed by a mail terminal device having a volatile memory having a buffer of a predetermined size, a writable nonvolatile memory, and a processing unit,
A step of storing the created message data in a file on a non-volatile memory by being executed by the processing device; a step of reading the data from the file in fixed lengths and storing the data in the buffer; and sequentially transmitting the data; A mail client program characterized by repeatedly sending a message.   When the size of the created message is less than or equal to a predetermined value by executing in the processing device, the message data is stored in the volatile memory, and the data stored in the volatile memory is fixed. 12. The mail client program according to claim 11, wherein the process of transmitting a message by repeating the step of storing data in the buffer for each length and sequentially transmitting data is realized.

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