KR20020016886A - A downmail method and system to restrain the sending of spam mail - Google Patents

Abstract

PURPOSE: A method and an apparatus of a down mail for restraining generation of a spam mail are provided to intercept a spam mail from an electronic mail such as an internet mail or a web mail by using a down mail method and an existing electronic mail method. CONSTITUTION: A sender(201) transmits an original mail to a transmission down mail server(202). The transmission down mail server(202) receives the original mail from the sender(201), stores the original mail into an SMB(Sender Mail Box)(209), generates a sending report mail, and transfers the sending report mail to a reception down mail server(203). A receiver(204) receives the sending report mail and the original mail from the reception down mail server(203) and the SMB(209) of the transmission down mail server(202), respectively. The receiver transmits a reception report mail to the sender(201) when the receiver(204) receives the original mail.

Description

A downmail method and system to restrain the sending of spam mail}

The present invention relates to a down-mail method that can block spam mails in a conventional e-mail such as wired and wireless Internet mail or web mail and a linkage method with an existing e-mail.

1 shows a conventional mail delivery method. Looking at the mail delivery system as a whole, a sender who creates a mail using a personal computer connected to the wired / wireless network and sends it to the sender's mail server, and a sender's mail server that receives the mail requested by the sender to send it to the receiver's mail server. It consists of a receiving mail server that receives mail from the sending mail server, stores it in the receiving mail mailbox, and finally delivers the mail to the recipient when the recipient requests it, and a recipient receiving the mail from the receiving mail server. The sender forwards the mail to the sender's mail server, and the sender's mail server delivers the mail to the receiver's mail server by a standardized communication procedure called Simple Mail Transfer Protocol (SMTP). The reading of e-mail is performed by standardized communication procedures such as Internet Mail Access Protocol (IMAP) or Post Office Protocol (POP) 3. Such a conventional mail system is generally implemented by three types of programs: a user agent (UA), a message transfer agent (MTA), and a receiving mail mailbox manager. UA is a program that allows users to compose and send mail or receive mails from the receiving mailbox, and many products such as Microsoft Outlook are used. The MTA is a program that delivers the actual mail to the destination mail server. Sendmail is mainly used. Receiving mail mailbox manager is a program that sends mail in receiving mail mailbox to recipients upon request of receiver. Products such as IMAP server or POP3 server program are widely used. Recently, a lot of web mails integrating a mail server and a web server have been widely used. In the case of such web mail, a sender sends a mail through an interface called CGI (Common Gateway Interface) over HTTP, which is a web protocol instead of the conventional SMTP communication procedure. Is transmitted to the sender's mail server, and instead of the standardized communication procedure such as IMAP or POP3, the receiver receives his mail from the receiver's mail server through an interface called CGI over HTTP.

Let's take an example of mail delivery in the conventional mail delivery method. When a sender with a mail address of kdhong@yahoo.com sends a mail to a recipient, tjkim@cntc.ac.kr, the mail is delivered through the following process. Mail from a person named kdhong@yahoo.com is first delivered to the mail.yahoo.com mail server via the SMTP protocol. The sendmail daemon, which was waiting on mail.yahoo.com, temporarily stores mail in the mail queue directory (/ var / spool / mqueue), and then sends it back to the mail.cntc.ac.kr mail server via the SMTP protocol. Delete the saved mail. In mail.cntc.ac.kr, the sendmail daemon waits, and if the mail.yahoo.com mail server checks the destination of the sent mail, it finds a file called tjkim in the receiving mail mailbox (/ var / mail directory). Save as. A recipient with an email address of tjkim@cntc.ac.kr receives a message from a mailbox on the receiving mail server using a UA such as Microsoft Outlook.

In the conventional mail method, regardless of the receiver's intention, the sender freely sends the mail and fills it into the receiving mail mailbox of the receiving mail server. There are a lot of burdens in delivering mail, such as keeping it in a mailbox and reading or deleting the archived mail. Therefore, there is a moral hazard in which the sender sends mails without any burden on the use of the mail, which causes the Internet to be congested and the receiving mail server is filled with spam mail, which causes a great obstacle in the necessary mail communication. And overloading of the receiving mail server, causing a huge reverse function of the e-mail.

Accordingly, in order to solve the above problems, the present invention intends to devise a method and a system relating to interworking with a down-mail and a conventional mail system receiving a mail from a sending mail box. In the down-mail method, the original mail sent by the sender is kept in the sending mail server, and only the sending notification mail is delivered to the recipient by the conventional mail method. Recipient who receives the sending notification mail receives the original mail stored in the sending mail server by his intention. Since the original mail is stored on the sending server until the recipient receives it, the sender is no longer burdened with managing the mailbox and deleting spam mails, which the recipient previously suffered. In this way, the burden of the mail communication is removed from the sender, and the purpose is to fundamentally prevent moral hazard in sending the mail.

1 is a conceptual diagram of mail communication in a conventional mail system

2 is an overall configuration diagram of the download method

Figure 3 Format of sending notification mail

Figure 4 MTA_n (205) processing procedure diagram when relaying is allowed

5 is a flowchart of the MTA_n 205 process in the case of the destination of the mail.

6 is a flowchart of the MTA_n 205 process in the case of the mail interlocking device.

7 is a flowchart of the processing of the sending mail mailbox manager 208. FIG.

8 is a flowchart of the receiver 204.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

Figure 2 shows the overall configuration of the down-mail method and the linkage method with a conventional mail according to an embodiment of the present invention. As a whole, it is composed of a conventional mail area and a downmail area, and a mail interlocking device 200 which interconnects the two areas. First, look at the functional blocks mounted in each device as follows.

* MTA (Message Transfer Agent): A message transfer agent that is responsible for the communication of mail is used in the conventional mail area MTA (215), used in the down-mail area and the mail interlocking device 200 is called MTA_n (205)

* UA (User Agent): As a user agent, it is installed in a personal computer or a portable terminal connected to a wired / wireless network to help a sender (201, 211) and a receiver (204, 214).

* RMB (Recipient MailBox) 207: Receiving Mail Mailbox that stores mail arriving at the receiving party

SMB (Sender MailBox) 209: Sending mail mailbox for storing original mails of senders 201 and 211. In this case, the original mail means a mail whose length of the mail body is longer than a predetermined length among the mails sent by the sender 201 and 211 to the receiver 204 and 214.

* Recipient MailBox Manager (RMM) 206: Recipient Mail Mailbox Manager managing RMB 207

* Sender Mail Box Manager (SMM) 208: Sender Mail Mailbox Manager managing SMB 209

The conventional mail area includes a sender 211 which composes a mail in a device equipped with a UA and sends it to the sender mail server 212; A sender mail server 212 which receives the mail requested by the sender 211 to send and sends the mail to the receiver mail server 213; A receiving mail server 213 which receives the mail from the sending mail server 212 and stores the mail in the RMB 207 and forwards the mail to the receiving 214 upon request of the recipient 214; And a receiver 214 for receiving mail from the receiving mail server 213. The sending mail server 212 is composed of only the MTA 215, but the receiving mail server 213 is equipped with an MTA 215, an RMM 206, and an RMB 207.

The down-mail area includes a sender 201 which composes a mail in a device equipped with a UA and sends it to the sender down-mail server 202; The sender 201 receives the mail requested to be created and sent, stores it in the SMB 209, and sends a sending notification mail to the receiving side down mail server 203, and the original stored in the SMB 209 at the request of the recipient 204. A sending side down mail server 202 for sending a mail to a recipient 204; A receiving side down mail server 203 which receives the sending notification mail from the sending side down mail server 202 and stores it in the RMB 207 and delivers the sending notification mail to the receiver 204 upon request of the recipient 204; And a receiver 204 which receives the sending notification mail from the receiving mail server 203 and downloads the original mail stored in the SMB 209 of the sending mail server 202 by its own selection. It is characterized by. The down-mail server delivers outgoing outgoing mail in response to a request from the MTA_n 205, which adds down-mail and mail interworking functions to the conventional MTA, an RMB 207 storing the received outgoing mail, and a recipient 204. RMM 206, SMB 209 for storing the original mail sent by the sender 201, and SMM 208 for receiving the original mail stored in the SMB 209 to the recipient in response to the request do.

The mail interlocking device 200 receives and stores original mails sent from the MTA_n 205, which adds down mail and mail interworking functions to the conventional MTA, and the sender 211 of the conventional mail area to the recipient 204 of the down mail area. SMB 209 and the recipient 204 is characterized in that the SMM 208 to send the original mail stored in the SMB 209 to the recipient. The MTA_n 205, SMB 209, and SMM 208 mounted on the down-mail servers 202 and 203 and the mail interlocking device 200 are all designed in the same manner and have flexibility in device configuration.

In FIG. 2, the communication procedure between each component has the characteristics of using the same standardized communication procedure as the conventional electronic mail method, specifically as follows; Sender 211, 201 sends mail to sender mail server 212 or sender downmail server 202 and MTA 215 or MTA_n 205 mounted in mail server 212,213, 202,203 and mail interlocking device 200. Mail communication between them uses SMTP. Recipients 214 and 204 receive mail or outgoing notification mail from the RMM 206 in the receiving mail server 213 or the receiving down mail server 203, and the recipients 214 and 204 send or receive the mail interlocking device 200 or send. Receiving the mail source from the SMM 208 at the side downmail server 202 uses IMAP or POP3. On the other hand, in the case of the web mail which is widely spread in recent years, when the senders 211 and 201 send mail to the sender mail server 212 or the sender downmail server 202, and the receivers 204 and 214 receive the mail server 203. Or CGI over HTTP, which is a web protocol, is used instead of the conventional communication procedure when receiving its own mail from the RMM 206 in the receiving mail server 213.

In a preferred embodiment of the present invention, the SMB 209 storing the original mail is configured as follows. The original mail is stored in a separate directory for each sender and for each mail, and the directory structure of the SMB 209 is as follows.

Sender's Mail Mailbox / Sender ID / Recipient ID / Email Number /

Here, the sender mail mailbox is a home directory name where original mail is stored, and the sender ID is an ID for distinguishing senders who send mail through the sender downmail server 202 or the mail interlocking device 200. The e-mail address is "mail ID @ domain name". The sender ID can be configured by using a character string that deletes a symbol or a special character from the sender's e-mail address. If all the senders who send the mail through the mail server 202 or the mail interlocking device 200 can be identified, the sender ID may be configured with only the mail ID. Recipient IDs are constructed using a string with symbols or special characters removed from the recipient's email address. A mail number is an identifier for distinguishing each mail when there are a plurality of mails that a specific sender wants to deliver to a specific receiver.

Two files are stored in the "/ Sender's Mailbox / Sender ID / Recipient ID / Mail Number /" directory where the original mail is stored. One is the file containing the original mail, and the other is the recipient of the original mail. This file contains the password used to authenticate. The directory storing the original mail is, in principle, deleted after the recipient receives the original mail.

A sender who wants to open his or her mail mailbox in SMB 209 of the sender downmail server 202 registers his own account with SMB 209 in the sender downmail server 202. When registering such an account, the sending down-mail server 202 creates the sender's mail mailbox, i.e., the "/ mailing side mail mailbox / sender ID /" directory in the sending mail mailbox.

On the other hand, the SMB 209 of the mail interlocking device 200 can also use a directory system in the form of " / sending side mail mailbox / sender ID / receiver ID / mail number / " like the SMB 209 of the down mail server. However, since the mail interlocking device 200 is a device for storing mail delivered from a plurality of unspecified conventional mail users to a specific down mail user, a mailbox resource may be allocated and managed for each recipient. Therefore, the SMB 209 of the mail interlock device 200 may be more convenient to use a directory system in the form of " / sending mail box / receiver ID / sender ID / mail number / " Since the structure is different from the SMB 209, software management is difficult. It may be advantageous to use the SMB 209 structure of the downmail servers 202 and 203 as it is by adding a separate index table so that a mailbox for each recipient can be easily found. SMB 209 of the mail interlock device 200 can be generated only for the sender in the header of the original mail to be generated or input only for the pre-registered recipient ID, which is the mailbox capacity and the mail interlock of the mail interlock device 200. It is a matter of the operating policy of the device 200.

The mail consists of a header and a body. The header provides important information in the delivery of the mail, such as the postal code, address and recipient name of the envelope, and the body refers to the content of the information to be delivered together with the contents of the letter. It is. In a preferred embodiment of the present invention, the mail is classified into the original mail and the signal mail, wherein the original mail is mail that the sender wants to send to the receiver, and the length of the mail body is longer than a predetermined length. It is used as an assistant for smooth communication of the original mail, such as notifying the recipient or notifying the sender that the recipient has received the mail. The difference between the signal mail and the original mail is the length of the body. If the length of the body is the same or shorter than the specified length, it is considered as the signal mail. Therefore, a conventional mail having a body shorter than a predetermined length is treated as a signal mail and is immediately delivered to the receiving side.

Figure 3 shows the configuration of the sending notification mail 301 in a preferred embodiment of the present invention, like the conventional mail is composed of a header 302 and a body, the body of the user ID 303, password 304, mail server ID 305, help site 306, and extracted mail content 307 area. The header 302 is identical to the header of the original mail but is prefixed with a prefix for sending notification, for example, "No:". The user ID 303 and the password 304 are for authenticating the recipient who wants to receive the original mail, that is, the user, and quickly finding the desired original mail in the SMB 209. The user ID 303 is composed of " / sender ID / receiver ID / mail number /, " which is the rest of the mail box portion of the original mail stored in the SMB 209 in the directory path of the original mail. 304 is composed of ASCII characters. The mail server ID 305 is an Internet address indicated by a domain name or a character string of the down mail servers 202 and 203 or the mail interlocking device 200 equipped with the SMM 208 managing the SMB 209. The help site 306 is a plugin that provides help for the sending notification mail 301 or automatically retrieves the original mail from the sending notification mail 301, or a website indicating a new UA version. 301) to help users who do not know well. When it is time for all users to understand the meaning of the dispatch notification mail 301, the help site area can be removed. The extracted mail contents 307 area is an area that extracts and outputs some random strings in the original mail body within the range of not exceeding the maximum body length of the signal mail, and helps the recipient to determine whether to receive the original mail. To give. The user ID, password, mail server ID, help site, and extracted mail content in the body are all strings. A null character is added at the end of each string to indicate the end of the string or the end of the body. The size of the body is set to 100 bytes, which can be adjusted later.

In a preferred embodiment of the present invention, the reception notification mail informs the sender that the recipient has received the original mail. The format of the reception notification mail is composed of a header and a body having 100 bytes of additional information. Can be. The header is created from the header of the original mail, which is a prefix that means that the address of the mail sender and recipient has been changed and received before the subject, eg "Rd:". The 100-byte additional information in the body is intended to inform the sender of additional information about the recipient's receipt of mail.

In the preferred embodiment of the present invention, the new message transfer agent MTA_n (205) is a conventional mail server (212, 213), down-mail server (202, 203) is added to the mail-related functions associated with the down-mail and the conventional mail MTA , To accommodate all the functions of the composite mail server and the mail interlocking device 200. Herein, a compound mail server means a server having a conventional mail sending function and a downmail receiving function or vice versa. System shape data, sender shape data, receiver shape data and interlocking shape data are introduced to determine the operation mode of MTA_n 205. The system shape data indicates whether the MTA_n 205 operates as a conventional mail server, a down mail server, a compound mail server, or a mail interlocking device 200. Whether the original mail delivered from the sending mail server 212 is delivered to the mail interlocking device 200, or not, it tells what the domain name or the Internet address of the prepared mail interlocking device 200 is. The sender shape data informs each sender of information about whether to use a conventional mail method, a down mail method, a compound mail method, and whether to use the mail interlocking device 200.

In the preferred embodiment of the present invention, upon receiving the mail, the system shape data is first examined to determine whether the mail interlock device 200 should operate as the mail interlocking device 200. If the mail linking device 200 is set, the mail linking function is processed, or if the received mail is determined whether relaying is allowed, the corresponding process is performed. Relay is also not allowed, and if it is not the destination of the mail, an error is returned as in the conventional method. The detailed operating procedure is as follows;

4 is a flowchart illustrating a process in which a mail received by the MTA_n 205 is allowed to be relayed according to an exemplary embodiment of the present invention. First, the type of mail is examined (401), and if it is a signal mail, it is processed according to the conventional mail method (406). If the type of the original mail is the original mail, it is determined how the original mail should be processed using the system shape data and the sender shape data of the mail sender (402). If it is to be delivered in the conventional mail method is processed according to the conventional mail method (406), if it is to be delivered in the down-mail method to store the original mail in the SMB 209 as follows (403); The sender ID is obtained from the sender information in the mail header to confirm whether the SMB 209 is established. If opened, obtain the recipient ID from the recipient information in the message header, and select an empty directory number starting from the lowest number in the corresponding mailbox directory, "/ Sender's Mailbox / Sender ID / Recipient ID /", which corresponds to the mail number. Find and create a directory with that number. The original mail is stored in the created directory, that is, the "/ mailing side mail mailbox / sender ID / receiver ID / mail number /" directory, and a password string is generated and stored as a password file. If the original mail is normally stored, the sending notification mail 301 is generated (405) and the mail is delivered according to the conventional mail method (406). If delivery of the delivery notification mail 301 fails, the original mail stored is deleted and the sender is notified that the mail delivery has failed in the conventional mail method. If there is no sender's SMB 209 in the original mail storage, the relevant SMTP error code is returned. If there is no free space even if the SMB 209 is opened, the relevant SMTP error code is returned (407). If one mail is sent to multiple recipients, the above procedure is repeated for each mail delivered to each recipient.

FIG. 5 is a flowchart of a process of the MTA_n 205 when the destination of the mail received by the MTA_n 205 is itself in the preferred embodiment of the present invention. If the downmail server on which it is mounted is the destination of the received mail, it is processed as follows according to the type of mail; If the type of mail is checked (501) and the signal mail is processed according to the conventional mail method (505). If it is the original mail, it is determined whether the original mail should be received according to the conventional mail method based on the system shape data and the receiver shape data of the receiver ID in the mail header (502). ). If it is necessary to receive in the down-mail method, check whether there is a mail relay device as the interlocking shape data, and if the mail interlocking device 200 is set to use the recipient shape data (503), the mail is delivered to the corresponding mail interlocking device 200 ( 504). However, if there is no mail interlock device 200 or the original mail is not allowed to link mail, return the relevant SMTP error code indicating a grammatical error, and do not use the down mail method and use the mail interlock device 200 on the receiver side. The sender is notified by mail that the mail cannot be delivered to the down-mail recipient because it cannot.

FIG. 6 is a flowchart illustrating a processing procedure of the MTA_n 205 when the device on which the MTA_n 205 is mounted is the mail interlocking device 200 according to an exemplary embodiment of the present invention. If the MTA_n 205 is mounted on the mail relay device, the sender ID and the receiver ID are obtained from the header of the mail to authenticate whether the mail relay device can be used (601). If authentication passes, look for the appropriate mailbox directory "/ Sender's Mailbox / Sender ID / Recipient ID /" (or "/ Sender's Mailbox / Recipient ID / Sender ID /"). After determining whether it is generated (602). And look for a directory number from low to empty in the directory, which corresponds to the mail number, and create a directory with that number, namely "/ mailbox / senderID / receiver ID / mail number /" (or &Quot; / Sender mail box / receiver ID / sender ID / mail number / ") The original mail is stored in the directory, and a password string is generated and stored as a password file (602). If the original mail cannot be used for mail relay, mailbox creation is not allowed, or the original mail cannot be saved due to insufficient mailbox space, the mail sent to the down-mail recipient cannot be delivered for this reason. The sender is notified by mail to send the mail again (606). When the original mail is normally stored, the transmission notification mail 301 is generated and transmitted according to the conventional mail method (605). If delivery of the delivery notification mail 301 fails, the original mail stored is deleted and the sender is notified that the mail delivery has failed in the conventional mail method.

FIG. 7 is a flowchart of a process of the SMM 208 mounted in the down-mail servers 202 and 203 and the mail interlocking device 200 according to the preferred embodiment of the present invention. The SMM 208 performs a function similar to that of the RMM 206 in the conventional mail method. Upon receiving the original mail request from the receiver (701), the user ID and password are received and the receiver is authenticated by checking whether there is a directory corresponding to the user ID and whether it matches the password stored in the directory (702). If the authentication passes, the original mail is sent to the recipient in the directory corresponding to the user ID (703). After sending the original mail, the original mail is not deleted or deleted when the recipient deletes the original mail (703). In addition, a receiving notification mail indicating that the recipient has received the mail is sent to the sender (704).

When the recipient receives the original mail and requests the original mail to be deleted, it is a principle but may not be deleted (703) in the SMM 208. For example, in case of an advertisement mail sent to a large number of recipients, an extra mailbox space is required to store separate original mails for each recipient, so only one original mail is kept and the original mail is received by multiple recipients. However, care should be taken because the recipient may deny receipt of the original mail by considering the mail server having the SMM 208 as a spam mailer.

In a preferred embodiment of the present invention, the SMM 208 can be implemented in two ways as follows; The first method is to configure the SMM 208 as a separate program from the conventional RMM 206 and assign a separate TCP / UDP port number. In the second method, the SMM 208 is composed of a conventional RMM 206 and a program to use the TCP / UDP port number assigned to the conventional RMM 206, and the character form of the user ID inputted when the receiver requests access. This is to determine which mailbox manager requests access. For example, if the user ID is a plain character, it attempts to access the RMM 206, and if it contains a special character "/", it attempts to access the SMM 208.

On the other hand, the SMM 208 of the down mail servers 202 and 203 and the mail interlocking device 200 manages the SMB 209, and examines the sender's use of the mail mailbox, available space, old original mail, and the like. The result is a mail box management function that notifies the sender of the result by e-mail, deletes the old original mail and sends it to the sender by mail if necessary. In the case of the SMM 208 of the mail interlocking device 200, it may additionally have an SMB 209 management function such as checking the use of available mail mailboxes, available space, old original mail, etc. and performing the corresponding processing. have.

8 is a flowchart illustrating a mail reception processing procedure of a receiver in a preferred embodiment of the present invention. After receiving the sending notification mail 301 from the computer equipped with the UA (801), it is determined whether to receive the original mail (802). The original mail is determined by determining whether the mail is intended to be received with information such as header information, mail server ID, and extracted mail contents of the sending notification mail 301. Receiving the original mail is performed by the same communication procedure as receiving the sending notification mail 301, but the other party's server, user ID and password for sending the mail are different. When receiving the original mail manually, the domain name or the Internet address of the sender's down-mail server 202 or the mail interlocking device 200 equipped with the SMM 208 that manages the stored original mail from the sending notification mail 301. After obtaining the user ID and password required for authentication in the SMM 208, the original mail should be received by accessing the SMM 208 of the sender-down mail server or the mail interlocking device 200 (805). The user can be embarrassed. In this case, you can get help by clicking the help site or download the plug-in or upgraded UA that has the function of automatically receiving the original mail (804) and receive the original mail automatically. If you are using a plugin or an upgraded UA that automatically receives the original mail, when the user clicks the View original mail button, the user automatically obtains the mail server ID, user ID and password from the sending notification mail (301), and receives the original mail. (808)

When the recipient receives the original mail and requests the other server's SMM 208 to delete the original mail, it may be principled or not deleted in the SMM 208. When the recipient receives the original mail and receives the original mail once more, if the same original mail is read as the previously received original mail, the mail server may be a spam mail server (806). You can protect yourself by considering the mailer as a likely server and registering 807 in the list of spam filters.

The present invention relates to a down-mail method and an interworking method with a conventional mail, which can solve the reverse function of the Internet mail and block spam mails. In the down-mail mode, the sender must keep all original mail sent by the sender server until the receiver reads it. Therefore, the sender embraces the burden of managing and deleting the mail, which has been experienced by the conventional recipient, thereby preventing the moral hazard of sending the mail. If the downmail method is applied, the sender cannot send spam mail itself unless the recipient receives the original mail, and the sender's server ID can not be sent unnecessarily due to the burden of excessive storage and management of the original mail. Can't hide the spammers in any case can be traced. The mail communication problem with the conventional mail method, which would be an obstacle to the introduction of the down mail method, is easily solved through a simple mail interlock device 200 having an original mail storage function. Therefore, a mail user can subscribe to any mail system without changing the conventional mail program, and thus there is no problem in mail communication. Therefore, the down mail system can be gradually introduced.

In addition, the above description of the present invention has been presented for purposes of illustration and description only. The invention is not limited to the form shown, and many variations and modifications are possible in light of the principles of the invention described above. The described embodiments are chosen to best explain the principles and substantive provisions of the present invention in order that those skilled in the art may use the present invention in various embodiments and as appropriately modified to the particular use thereof. It is limited only by the appended claims.

Claims (11)

In the mail communication such as internet mail or web mail through wired or wireless network, The original mail sent by the sender 201 is received by the sending side down mail server 202 and stored in its own SMB 209, and then made a sending notification mail 301. The SMB 209 of the sender's downmail server 202 is delivered to the mail server 203, and the recipient 204, who has received the sending notification mail 301 from the receiver's downmail server 203, by his intention. Receiving the original mail stored in the, and when the recipient 204 receives the original mail, the down-mail method and system characterized in that to send the incoming notification mail to the sender (201) In the conventional mail sender 211, such as web mail or Internet mail, to send a mail to the down-mail recipient 204, Received down-mail server 203 receives the original mail delivered to the mail interlocking device (200) in its own SMB (209), the mail interlocking device 200 generates the outgoing notification mail (301) receiving side The recipient 204, which forwarded to the down mail server 203 and received the sending notification mail 301 from the receiving down mail server 203, sent to the SMB 209 of the mail interlocking device 200 by its own intention. Receive the original mail is stored, and when the receiver 204 receives the original mail, the mail interworking method and system, characterized in that to send the received notification mail to the sender (211) When the down-mail sender 201 sends a mail to the recipient 214 of conventional mail such as web mail or Internet mail, The original mail sent by the sender 201 is received by the sending side down mail server 202 and stored in its own SMB 209 to create a sending notification mail 301, and the sending notification mail is a receiving mail using a conventional mail method. Recipient 214, which forwards to the server 213 and receives the sending notification mail 301 from the receiving mail server, is stored in the SMB 209 of the sending mail server 202 by its intention. Receiving the mail, and sending the received notification mail to the sender 201 of the original mail when the recipient 214 receives the original mail; Alternatively, the mail interworking method and system, characterized in that the original mail sent by the sender 201 is delivered directly to the receiving mail server 213 as in the conventional mail method. The method according to claim 1, 2 and 3, The down-mail recipient 204 receives the original mail from the sender down-mail server 202 or the SMM 208 of the mail interlocking device 200, or the conventional mail receiver 214 receives the SMM of the send-down down-mail server 202. The communication procedure for receiving the original mail from 208 is the same as the communication procedure for receiving the mail from the RMM 206 of the receiving mail server 213 by the conventional mail receiver 214, and the mail interlocking device 200. A method of making the communication procedure between the downmail servers 202 and 203 and the conventional mail servers 212 and 213 the same as the communication procedure between the conventional mail servers 212 and 213. The method according to claim 1, 2 and 3, The mail is classified into the original mail and the signal mail, the signal mail and the original mail are distinguished by the length of the mail body, the sending notification mail 301 is used to notify the sending of the original mail, and the original notification is received using the mail. How to notify the recipient that the message has been received The method according to claim 1, 2 and 3, The down mail server 202, 203 provides the SMB 209 in the form of " / sending side mail mailbox / sender ID / receiver ID / mail number / ", and in the mail interlocking device 200, " / sending side mail mailbox / sender " SMB 209 in the form of ID / Recipient ID / Mail Number / ”or“ / Sender Mail Mailbox / Recipient ID / Sender ID / Mail Number / ” The method according to claim 1, 2 and 3, Delivering original mail upon request of recipients 204 and 214; Not deleting or deleting the original mail when the recipient requests the deletion of the original mail after receiving the original mail (703); Notifying the sender (201, 211) that the original mail was received by the received notification mail after delivering the original mail (704); And SMB 209 examines the mail mailbox usage, available space and old original mail for each sender and performs the corresponding processing, and then informs the sender of the results or uses the mailbox, free space and old original mail for each recipient. SMM 208 of the down-mail servers 202 and 203 and the mail interlock device 200 characterized by informing the recipients of the result after checking and performing the corresponding processing. The method according to claim 7, The SMM 208 is configured as a program with the conventional RMM 206 to use a TCP / UDP port number assigned to the conventional RMM 208, and any mail in the form of a character of a user ID inputted when a recipient requests access. How to identify if you are requesting access to Mailbox Manager The method according to claim 1, 2 and 3, The mail linking device 200, the sender down mail server 202, and the receiver down mail are determined by determining their operation mode for each mail sent or received as system shape data, sender shape data, receiver shape data, and interlocking shape data. MTA_n 205 having features 402 and 502 that can operate as a server 203, a sending mail server 212, a receiving mail server 213, or a compound mail server. The method according to claim 9, Receive the signal mail that is allowed to be relayed to process the conventional mail transmission (406) or receive the original mail allowed to be relayed and stored in the SMB (209) (403) to generate a sending notification mail (301) (405) Forwarding to the receiving down-mail server 203 or the receiving-side mail server 213 (406) and returning the relevant SMTP error code if the storage of the original mail fails (407); Receives the signal mail as the destination and processes it according to the conventional mail method (505), and if the mail is interlocked by receiving the original mail as the destination, the mail interlocking device (200) (504), otherwise receiving the original mail Notifying the sender of the reason for the failure of the mail delivery by mail while sending the relevant SMTP error code after blocking (506); If the device on which it is mounted is a mail interlocking device (200), the original mail is received, and if it is normal, the original mail is stored in the SMB (209) (602) and then the sending notification mail (301) is generated (604) as in the conventional mail method. Forwarding (605) and notifying the sender of the details by mail (606) if the original mail cannot be processed due to a failure of authentication or a mailbox creation; And MTA_n (205), in the case of the mail delivered to a plurality of recipients, the mail to be delivered for each recipient is treated as a separate mail. The method according to claim 1, 2 and 3, When the recipients (204, 214) want to receive the original mail, they can click the help site to refer to the help site or download and install a plug-in or upgraded UA that has the ability to automatically receive the original mail (804). Click the button to automatically obtain the mail server ID, user ID and password from the sending notification mail (301) to receive and show the original mail (808), the recipient received the original mail once again after receiving the original mail If the same original mail is read when the original mail was received previously, the mail server may be a mail server sending spam mail (806), so consider the mail server as a high potential spam mailer and list spam filtering. How to register (807)