WO2010037290A1

WO2010037290A1 - Method and system for transmitting cross-domain remote mail

Info

Publication number: WO2010037290A1
Application number: PCT/CN2009/073530
Authority: WO
Inventors: 林少章
Original assignee: 腾讯科技（深圳）有限公司
Priority date: 2008-09-28
Filing date: 2009-08-26
Publication date: 2010-04-08
Also published as: CN101383784A

Abstract

A method and a system for transmitting cross-domain remote mail are provided by the present invention. Said method includes the following steps: receiving a mail posted by a user from local domain to external domain; forwarding said mail from the local domain to the external domain through the intra network.

Description

Method and system for transmitting cross-domain remote mail

The invention belongs to the field of network communication, and in particular relates to a method and system for transmitting cross-domain remote mail. Background of the invention

The protocol used for email transmission is the Simple Mail Transfer Protocol (SMTP). The SMTP protocol is a store-and-forward protocol that allows mail to be sent to the final destination through a series of servers. The server stores the arriving mail in a queue, waiting to be sent to the next destination, the next destination can be a local user, or a remote mail server.

When sending cross-domain remote mail, the user sends the mail to the SMTP border gateway by means of Webmail, smtp, Esmtp, etc. through the Mail User Agent (MUA), for example, through a browser, Windows Outlook, foxmail, etc. Gateways, BG). SMTP BG provides a standard SMTP protocol to send mail, and receives mail from other mail transfer agents (MTTAs) of this mail system, and sends them to the external mail server through the public network. User mail from the foreign domain mail server can also be sent to the SMTP BG through the mail exchange server (Mail Exchanger, MX), and sent to other foreign domain mail servers by the SMTP BG through the public network.

When a user sends a cross-domain (local to external domain) remote mail, for example, a mail sent to a foreign country in China, due to the use of the ordinary public network, insufficient public network resources make the sending of the mail very slow. At the same time, the public network is unstable, causing frequent interruptions in mail transmission, causing user dissatisfaction. Summary of the invention

The purpose of the embodiment of the present invention is to provide a method for transmitting cross-domain remote mail, which aims to solve the problem that the existing public network transmission is used when sending cross-domain remote mail, which causes the mail to be sent slowly.

The embodiment of the present invention is implemented by the method for sending a cross-domain remote mail, and the method includes the following steps:

Receiving mails delivered by users from the domain to the outside domain;

The message is forwarded from the domain to the foreign domain through the internal network.

Another object of the embodiments of the present invention is to provide a cross-domain remote mail sending system, where the system includes:

a relay server, configured to receive a mail delivered by a user from an external domain of the domain, and send the mail to an external domain;

The forwarding server is connected to the relay server through the internal network, and is configured to receive the mail sent by the relay server from the local domain to the external domain and send the mail to the external domain mail server.

In the embodiment of the present invention, since the inter-domain remote mail is transmitted by using the internal network, the transmission speed of the mail can be greatly improved, and the stability of the mail transmission is ensured. BRIEF DESCRIPTION OF THE DRAWINGS

1 is a network structure diagram of a cross-domain remote mail transmission system provided by the prior art; FIG. 2 is a flowchart of an implementation of a method for transmitting a cross-domain remote mail according to an embodiment of the present invention; FIG. 3 is a cross-domain provided by an embodiment of the present invention; A network architecture diagram of a remote mail sending system; FIG. 4 is a structural diagram of a relay server according to an embodiment of the present invention;

FIG. 5 is a structural diagram of a forwarding server according to an embodiment of the present invention. Mode for carrying out the invention

In order to make the objects, the technical solutions and the advantages of the present invention more comprehensible, the present invention will be further described in detail below with reference to the accompanying drawings. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the embodiment of the present invention, the remote inter-domain mail is transmitted from the local domain to the outer domain through the internal network, which can ensure the stability of the transmission of the transmitted mail, greatly improve the transmission speed of the remote cross-domain mail, and reduce the occurrence of the mail transmission interruption.

The internal network in the embodiment of the present invention is a local area network, and the erection method is basically the same as that of the local area network. The local area to the external domain is generally connected by a dedicated line, which can ensure a relatively fast mail transmission speed and stability of mail transmission.

FIG. 2 shows an implementation process of a cross-domain remote mail sending method according to an embodiment of the present invention, which is described in detail as follows:

In step S201, receiving a mail delivered by the user from the local domain to the outside domain;

In step S202, the mail is forwarded from the local domain to the foreign domain through the internal network.

As an embodiment of the present invention, in order to avoid the adverse effect of the interruption of the mail transmission on the user, the message that is interrupted during the transmission is subjected to a breakpoint transmission to ensure the integrity of the mail transmission. When the mail transmission is interrupted, the domain sends a mail renewal request to the outer domain, and the foreign domain obtains the information of the interruption of the mail transmission according to the received mail byte, and notifies the domain where to resume the transmission, and the domain is from the interruption of the mail to The foreign domain resumes transmission of the interrupted message.

In the embodiment of the present invention, when the external domain mail delivery fails, the local domain receives the returned mail of the internal network, and then can resend the returned mail through the public network to the external domain in an ordinary manner.

FIG. 3 shows a network architecture of a cross-domain remote mail sending system according to an embodiment of the present invention. For the convenience of description, only parts related to the embodiments of the present invention are shown.

The relay server 31 provided in the local domain is forwarded through the internal network 32 and set to the external domain. The server 33 is connected.

The relay server 31 can receive the mail delivered by the user from the local domain to the outside domain using the standard SMTP protocol, and deliver the mail to the forwarding server 33 via the internal network 32. The forwarding server 33 receives the mail sent by the relay server 31 from the local domain, and after receiving the mail, forwards the mail to the foreign border gateway (BG) 34, and deletes the mail after the forwarding is successful.

The local BG receives the e-mail returned by the relay server 31, and sends the e-mail to the external domain BG 34 through the public network in an ordinary manner.

The foreign domain BG 34 receives the mail sent from the forwarding server 33 and delivers it to the foreign mail server of the foreign domain mail carrier, and ends if the delivery is successful. As an embodiment of the present invention, if the delivery fails, the foreign domain BG 34 returns the mail to the local domain MX 35, and the outer domain BG 34 is configured by the relay server 31, and an IP address is specified when the mail is returned. The IP address is the domain. IP address of the MX 35. At the same time, the domain MX 35 is configured by the relay server 31, and the domain MX 35 is configured to allow the mail domain to receive the domain name suffix of the domain, and specifically receive the return mail from the foreign domain BG 34.

FIG. 4 shows the structure of a relay server according to an embodiment of the present invention. For the convenience of description, only parts related to the embodiment of the present invention are shown.

The relay server 31 sends the client program used by the Mail Deliver Agent (MDA), that is, the MTA, after receiving the user's mail, the host's domain name is used to determine that the mail is sent to the foreign domain, and the connection is The domain mail receiving unit 311 sends the mail information of the sender, the recipient, the multipurpose Internet Email Extension (MIME), the mail byte, and the like to the local mail receiving unit 311.

After successfully receiving the mail information, the local mail receiving unit 311 saves the mail information as a file and stores it in the local mail queue 312. The file name of the file is globally unique, and the file name formed after the mail is received by the forwarding server 33 is the same. . After successfully receiving the mail, the local mail receiving unit 311 puts the file name of the mail in the local mail queue 312 into the shared memory 313. As an embodiment of the present invention, the shared memory 313 is protected by a mutual exclusion lock to ensure the integrity of the shared data operation. Each object in the shared memory 313 corresponds to a tag that can be called a "mutually exclusive lock". The tag is used to ensure that only one thread can access the object at any one time.

As an embodiment of the present invention, if the local mail receiving unit 311 finds that the shared memory 313 is full, it sends the mail to the local domain BG, and deletes the mail from the local mail queue 312, and the local domain BG passes the common mode. It is sent to the external domain BG 34 via the public network.

The local mail delivery unit 314 scans the local mail queue 312 at startup, and puts the file names of all the mails in the local mail queue 312 into the shared memory 313 for subsequent delivery. At the time of delivery, the local mail delivery unit 314 cyclically retrieves the file name of the mail to be delivered from the shared memory 313, and obtains information about the mail, such as the sender, the recipient, and the MIME, from the local mail queue 312. It is delivered to the forwarding server 33.

If the delivery is successful, the local mail delivery unit 314 deletes the mail from the local mail queue 312. As an embodiment of the present invention, if the multiple delivery fails, the local mail delivery unit 314 sends the mail to the local domain BG, and deletes the mail from the local mail queue 312, and the local domain BG passes the normal manner. The public network is sent to the external domain BG 34.

In order to avoid the mail transmission failure caused by the transmission interruption, as an embodiment of the present invention, if an interruption occurs during the mail transmission, the mail renewal request module 3141 sends a mail renewal request to the forwarding server 33, and acquires the transmission interruption returned by the forwarding server 33. Information about the interruption of the mail. The mail retransmission module 3142 continues to transmit the interrupted mail to the forwarding server 33 from the interruption of the mail according to the interruption information obtained by the mail renewal request module 3141.

FIG. 5 shows the structure of a forwarding server according to an embodiment of the present invention. For the convenience of description, only parts related to the embodiment of the present invention are shown.

The foreign domain mail receiving unit 331 receives the mail sent by the relay server 31, and acquires the mail. The mail information of the sender, the recipient, the MIME, the byte of the mail, etc., saves the mail information as a file and stores it in the foreign mail queue 332, the file name of the file and the file name formed in the relay server 31. The same, to ensure that the file name is globally unique.

The foreign mail delivery unit 333 parses the mail in the foreign domain mail queue 332 into a format acceptable to the foreign domain BG 34, forwards it to the foreign domain BG 34, and sends it to the foreign mail server of the foreign mail carrier through the foreign domain BG 34.

As an embodiment of the present invention, if the mail is interrupted during the transmission, the local mail delivery unit 314 of the relay server 31 sends a mail renewal request to the mail renewal transmission module 3311, and the mail renewal transmission module 3311 is based on the breakpoint. The renewal protocol knows the file name of the mail, retrieves the mail from the foreign domain mail queue 332, knows the byte that the mail has received, and notifies the local mail delivery unit 314 where to start the transmission of the interrupted mail. After the resume transmission is completed, the foreign mail delivery unit 333 reads the mail from the foreign domain mail queue 332, obtains the sender, the recipient, the MIME, and the like, forwards it to the foreign domain BG 34, and sends it from the foreign domain mail queue 332. delete.

In the embodiment of the present invention, since the inter-domain remote mail is transmitted by using the internal network, the transmission speed of the mail can be greatly improved, and the stability of the mail transmission is ensured. At the same time, the use of breakpoints can effectively improve the utilization of network resources and avoid the failure of mail transmission to cause mail transmission failure. In addition, internal proprietary protocols can be used to effectively prevent cyber attacks.

The above is only the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modifications, equivalents, improvements, etc., which are made within the spirit and principles of the present invention, should be included. It is within the scope of the invention.

Claims

Claim

A method for transmitting a cross-domain remote mail, wherein the method comprises the following steps:

Receiving mails delivered by users from the domain to the outside domain;

2. The method of claim 1 wherein the method further comprises the steps of:

When the mail transmission is interrupted, the mail is sent to the outbound domain to renew the request, and the information about the interruption of the mail transmission returned by the foreign domain is obtained;

The interrupted message is transmitted to the outside domain according to the obtained interrupt information.

3. The method according to claim 1, wherein the method further comprises the steps of:

When the external domain fails to deliver the mail, the local domain receives the returned mail from the internal network, and resends the returned mail through the public network to the external domain.

The method according to claim 2, wherein the acquiring the interruption information of the mail transmission returned by the foreign domain comprises:

The foreign domain receives the mail renewal request of the local domain, obtains the interruption information of the mail transmission according to the received mail byte, and sends the interruption information to the local domain.

A system for transmitting a cross-domain remote mail, the system comprising: a relay server, configured to receive a mail delivered by a user from an outbound domain of the domain, and send the mail to an external domain;

The forwarding server is connected to the relay server through the internal network, and is configured to receive the mail delivered by the local server to the external domain sent by the relay server, and forward the mail to the external domain mail server.

The system according to claim 5, wherein the relay server comprises: a local mail receiving unit, configured to receive a mail delivered by the local domain sent by the user to obtain an email message of the mail, And configuring the file name of the mail;

The local mail queue is used to save the mail information obtained by the mail receiving unit of the local domain; the shared memory is used to save the file name of the mail;

The local mail delivery unit is configured to retrieve the delivery of the mail to be delivered from the shared memory to the forwarding server.

7. The system of claim 6, wherein the local mail delivery unit comprises:

a mail renewal request module, configured to send a mail renewal request to the forwarding server when the mail transmission is interrupted, and obtain an interruption information of the mail transmission returned by the external domain;

The mail renewal module is configured to resume transmission of the interrupted mail from the interruption of the mail to the forwarding server according to the interruption information of the mail transmission.

The system according to claim 5, wherein the forwarding server comprises: an external domain mail receiving unit, configured to receive the mail delivered by the local domain sent by the relay server, obtain the information of the mail and save the information ;

An external domain mail queue for storing mail information obtained by the foreign domain mail receiving unit;

The external domain mail delivery unit is configured to forward the mail in the foreign domain mail queue to the foreign domain mail server.

9. The system of claim 8, wherein the foreign domain mail receiving unit comprises:

a mail renewal positioning module, configured to receive a mail renewal request of the relay server, obtain an interruption information of the mail transmission according to the received mail byte, and notify the relay service Device.

10. The system of any of claims 5 to 8, wherein the system further comprises:

The local mail exchange server is configured to receive the returned mail of the foreign domain;

The external border gateway is used to return the mail to the corresponding local mail exchange server according to the configured address when the delivery to the external domain mail server fails.