CN101163066B - Distributed electronic mail system - Google Patents
Distributed electronic mail system Download PDFInfo
- Publication number
- CN101163066B CN101163066B CN2006101654094A CN200610165409A CN101163066B CN 101163066 B CN101163066 B CN 101163066B CN 2006101654094 A CN2006101654094 A CN 2006101654094A CN 200610165409 A CN200610165409 A CN 200610165409A CN 101163066 B CN101163066 B CN 101163066B
- Authority
- CN
- China
- Prior art keywords
- server
- center
- forwarding
- network
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
The invention discloses a distributed e-mail system, which consists of a systems management server and a plurality of implementation domains. Each implementation domain comprises a master control server; N central mail transmitting servers, which are connected with the master control server; and N authentication servers. N mail servers are hung under each central mail transmitting server. Each mail server is connected with N users. Each master control server of the implementation domain is connected with the system management server through an Ethernet. The central mail transmitting server and the authentication server are connected with the master control server through an Ethernet wire. The mail server is connected with the users with the Ethernet wire, too. The central mail transmitting server is connected with the mail server through a Virtual Private Network. The central mail transmitting server is in charge of the transmitting of the mails. The mail server is used for storing the mails of the users. Each central mail transmitting server can transmit mails in N domains; one mail server is used for storing the users mails in one domain, thus the distributed mail storage module is formed.
Description
Technical field
The present invention relates to a kind of distributed E-mail system based on Virtual Private Network and distributed storage mode.This distributed E-mail system can be used for making up the e-mail system of tissues such as enterprise, government department, group, for a plurality of domain names provide the e-mail forward stores service.
Background technology
Present e-mail system, in order to provide the e-mail forward stores service to a plurality of domain names, adopt following two kinds of methods basically:
Method one a: mail center that is used for storage of e-mails is provided.All users' Email all sends to this mail center, and preserves on the uniform storage device at center.The DNS record of the MX record of each domain name, smtp server, POP3 server is all pointed to the server of mail center.The server that all users will log on this mail center carries out the transmitting-receiving of mail.
Method two: no central server, still, be mail server of each mail domain configuration, the DNS record of the MX record of mail domain, smtp server, POP3 server is all pointed to the public network IP address of the mail server of mail domain.Mail directly sends on the mail server of each mail domain, and the user directly carries out the transmitting-receiving of mail by the mail server on the own territory.
For method one, the mail data of centralized stores is very high to the requirement of mail center memory device, in case hardware and software failure appears in memory device, storage room, will all users' mail data all be exerted an influence; And the cost of special memory device is very high, can not satisfy operation mailing system high repayment requirement.In addition, because the transmitting-receiving of mail all will be undertaken by the mail center server, be in and transmit again after mail between the same company personnel of same local area network (LAN) inside also will arrive the mail center server through the Internet transmission, not only wasted the network bandwidth, and increased unsafe factor.
For method two, it requires the mail center server must possess fixed public network IP address.In China, want to have fixed public network IP address, will spend the expense of hundreds of unit every month.If mail server does not have fixed public network IP address, the mail that mails to the territory at its place just can't be sent to.If use the DDNS mode, the renewal of domain name is slow, influences the transmission of mail.In addition, it is all very high to set up oneself the hardware and software cost and the TCO (total cost of ownership) of mail server.
Summary of the invention
In view of the foregoing, the purpose of this invention is to provide a kind of new distributed E-mail system, this distributed E-mail system becomes distributed email storage pattern with traditional centralized email storage pattern, reduce the influence of the system failure to the user mail data, this distributed E-mail system has also been broken away from mailing system to the fixedly dependence of public network IP address, even in that do not have still can operate as normal under the situation of public network IP.
For achieving the above object, the present invention by the following technical solutions: it is made of a kind of distributed E-mail system system management server and several enforcement territories, and each is implemented territory and links to each other with system management server by netting twine;
Each is implemented the territory and is made of main control server, a N center mail forwarding server, a N certificate server and N mail server; Each main control server of implementing the territory links to each other with system management server, main control server is hung N center mail forwarding server and N certificate server down, each center mail forwarding server is hung N mail server again down, and each mail server can connect N user;
Between main control server and the system management server, between center mail forwarding server and certificate server and the main control server, link to each other by the Ethernet netting twine between mail server and the user, link to each other by VPN(Virtual Private Network) between center mail forwarding server and the mail server, constitute distributed tree.
Described center mail forwarding server is responsible for the forwarding of mail, and the VPN request of receipt mail server realizes that mail server is not had the fixedly support of IP of public network; Mail server is used to store user's mail;
Each center mail forwarding server implementing in the territory can be transmitted the mail in N territory, and a mail server that links to each other with center mail forwarding server is corresponding with a kind of mail domain, is used to store a kind of mail domain user's mail.
Described center mail forwarding server is assigned fixed public network IP address; Mail server is assigned the implicit IP address that is used for forwarding by mail.
The present invention with the email storage of a mail domain on a mail server, be responsible for the forwarding of several mail domain mails by a center mail forwarding server, thereby traditional centralized email storage, forward mode have fundamentally been changed, be converted into distributed email storage, forward mode, alleviate center mail forwarding server load, greatly reduce the influence of the system failure the user mail data.
In addition, in order to break away from dependence to public network IP address, save public network IP address, the present invention only distributes fixed public network IP address to each center mail forwarding server, IP address to each inside of mail server distribution corresponding with each mail domain, that link to each other with center mail forwarding server is used for the forwarding of mail.
Description of drawings
Fig. 1 is a distributed E-mail system system configuration schematic diagram of the present invention;
Fig. 2 implements mail forwarding fundamental diagram between the territory for the present invention is different;
Fig. 3 transmits fundamental diagram for mail between the different mail territory, the same enforcement of the present invention territory;
Fig. 4 transmits fundamental diagram for the same mail domain mail in the same enforcement of the present invention territory;
Fig. 5 is VPN(Virtual Private Network) connection diagram between center of the present invention mail forwarding server and the mail server;
Fig. 6 is a mail forwarding server mail treatment flow chart in center of the present invention;
Fig. 7 is a certificate server verification process schematic diagram of the present invention;
Fig. 8 is a mail server hardware components theory diagram of the present invention;
Fig. 9 is a mail server mail treatment flow chart of the present invention.
Embodiment
The present invention is described in detail below in conjunction with accompanying drawing.
Fig. 1 is a distributed E-mail system system configuration schematic diagram of the present invention.As shown in the figure, distributed E-mail system disclosed by the invention is made of system management server and several enforcement territories, and each is implemented territory and links to each other with system management server by netting twine.Each is implemented the territory and is made of a main control server, a N center mail forwarding server, a N certificate server and N mail server; Each main control server of implementing the territory links to each other with system management server, main control server is hung N center mail forwarding server and N certificate server down, each center mail forwarding server is hung N mail server down, and each mail server can connect N user; Between main control server and the system management server, between center mail forwarding server and certificate server and the main control server, link to each other by the Ethernet netting twine between mail server and the user, link to each other by VPN(Virtual Private Network) between center mail forwarding server and the mail server, constitute distributed tree.
The system management server that constitutes distributed E-mail system mainly is responsible for user's registration management, is prayed for expense; The main control server administration interface is provided; Realize the control of administration authority.Main control server in each enforcement territory mainly is in charge of Servers-all such as center mail forwarding server, certificate server and the mail server in this enforcement territory; And to the management (as adding, delete, continue to pay dues etc.) of user's domain name.Each implements the mainly forwarding of responsible mail of center mail forwarding server in the territory; The protection of virus email, spam; The VPN request of receipt mail server realizes that mail server is not had the fixedly support of IP of public network.Certificate server mainly is responsible for user's authentication.Mail server is mainly used in storage user's mail, and the hardware device of functions such as route, safety is provided.
The center mail forwarding server that constitutes each enforcement territory of the present invention can be transmitted the mail in N territory, and the mail server that center mail forwarding server is hung down is corresponding with a mail domain.In specific embodiments of the invention, each each center mail forwarding server of implementing in the territory can be transmitted the mail in 1000 territories, simultaneously, each center mail forwarding server can be supported 1000 mail servers, a mail server is corresponding with a mail domain, is responsible for storing the mail in a territory by a mail server.Since the present invention with the email storage of a mail domain on a mail server, be responsible for the forwarding of several mail domain mails by a center mail forwarding server, thereby traditional centralized email storage, forward mode have fundamentally been changed, be converted into distributed email storage, forward mode, alleviate center mail forwarding server load, greatly reduce the influence of the system failure the user mail data.
In addition, in order to break away from dependence to public network IP address, save public network IP address, the present invention only distributes fixed public network IP address to each center mail forwarding server, again because each center mail forwarding server can be transmitted the mail of N mail domain, so the present invention's pair each mail server corresponding with each mail domain, that link to each other with center mail forwarding server distributes the IP address of an inside, is used for the forwarding of mail.
The enforcement territory that constitutes distributed E-mail system of the present invention can be distributed in different provinces, city, different enterprises, and each is implemented territory and links to each other with system management server by netting twine.Fig. 2 implements mail forwarding fundamental diagram between the territory for the present invention is different.As shown in the figure, if be arranged in the user a (aa@sohu.com) that implements territory A and want to send out an envelope Email to being arranged in the user b (bb@yahoo.com) that implements territory B.User a issues the mail server (sohu.com) that is attached thereto with Email earlier, mail server (sohu.com) is issued mail the center mail forwarding server S1 that is attached thereto by virtual private network again, center mail forwarding server S1 will implement the Email of territory party A-subscriber a and issue the center mail forwarding server S2 that implements to be responsible among the B of territory forwarding yahoo mail domain mail according to the MX record of user b Email, center mail forwarding server S2 is according to implicit IP address, mail directly is transmitted to the mail server (yahoo.com) of being responsible for storage yahoo mail domain mail, and user b (bb@yahoo.com) directly takes from own Email to mail server (yahoo.com).
Fig. 3 transmits fundamental diagram for mail between the different mail territory, the same enforcement of the present invention territory.Wanting to send mail to the user c (c@google.com) that implements territory A if be arranged in the user a (a@sohu.com) that implements territory A. user a sends to Email on the mail server (sohu.com) that is attached thereto earlier, mail server (sohu.com) is issued mail the center mail forwarding server S1 that is attached thereto by virtual private network, center mail forwarding server S1 is forwarded to center mail forwarding server S2 according to the MX record of the mail domain name of user C with mail.Center mail forwarding server S2 directly is transmitted to mail the mail server (google.com) of being responsible for storage google.com mail domain according to implicit IP address; User c directly mails to the mail server (google.com) and gets final product.
Fig. 4 transmits fundamental diagram for the same mail domain mail in the same enforcement of the present invention territory.Want to send mail to user d (d@sohu.com) if be arranged in the user a (a@sohu.com) that implements territory A.User a sends to Email on the mail server (sohu.com) that is attached thereto earlier.User d directly mails to the mail server (sohu.com) and gets final product.
The characteristics of distributed E-mail system of the present invention are with different software modules, operate in respectively on the different servers as transceiver module, user authentication module, email storage module, User Access Module etc., finish the function of whole e-mail system jointly.If necessary, each software module can also split on different servers again and move, and server is carried out load balancing, thereby, diversify risks, centralized email storage is converted into distributed storage, the influence that Single Point of Faliure is brought is reduced to minimum; Simultaneously, the extensibility of whole system and manageability are strengthened greatly.
Center mail forwarding server in each enforcement territory of the present invention is responsible for the forwarding of user mail; The VPN request of receipt mail server realizes that mail server is not had the fixedly support of IP of public network.Characteristics of the present invention are that each implements to link to each other by virtual private network between center mail forwarding server and its N mail server hanging down in territory, as shown in Figure 5.VPN (Virtual Private Network) is a VPN (virtual private network), and it sets up interim, safety, as to simulate a point-to-point connection by a common network (as Internet).It is an information tunnel that passes through common network, and both sides can carry out freedom and the point-to-point connection of safety by this tunnel in common network, the transmission data.Mail server of the present invention is understood connection center mail forwarding server initiatively when inserting the Internet, and sets up a vpn tunneling with it.The mail server corresponding with each domain name is assigned to a fixing implicit IP address, and this IP address is used to locate the mail server of domain name correspondence fast when the mail forwarding server cluster forwarding by mail of center, so that transmit fast.
When center mail forwarding server was received the mail that mails to certain territory, according to the corresponding relation of domain name and implicit IP address, system can accurately navigate to the mail server at this mail domain place, and mail will directly be sent to, as shown in Figure 5.
Carry out the transmission of data by VPN(Virtual Private Network) between center of the present invention mail forwarding server and the mail server, adopt udp protocol that the TCP/IP data are encapsulated, can be used in the network environment of multi-level NAT (Network Address Translation, network address translation).And because vpn tunneling is initiatively to be initiated to connect by mail server, Access Control List (ACL) (the ACL of the firewall/router equipment in the network environment at mail server place, Access Control List) can allow this visit from inside to outside, thereby make the communication between mail server and the center mail forwarding server can firewall-penetrating and NAT.
Utilize VPN technologies, no longer be subject to network environment as the mail server of enterprise's center mail forwarding server, the center mail forwarding server also mail service on mail server is at any time initiated to connect and is carried out transfer of data.
The flow chart that Fig. 6 handles postal matter for center of the present invention mail forwarding server.As shown in the figure, after center mail forwarding server receives connection request, carry out following steps:
1, do you judge it is the connection request that mail server sends? do you if then the request of receipt mail server sends mail, if not, then judge it is the overseas user of going out of this enforcement?
2 if enterprise goes out the user, carry out password authentification, by then sending mail, not by then returning error message; Do you if not the user that goes out of enterprise, then further judge it is the mail that mails to mail server?
3, if not, then return error message; If further judge it is virus email?
4 if then abandon; Do you if not virus email, then further judge it is spam?
5 if spam then adds spam tagging; If not, then carry out following steps;
6, mail and the mail that added spam tagging are selected corresponding mail server according to domain name, mail is sent on the mail server store, wait for that the user reads.
Each certificate server of implementing in the territory mainly provides the authentication service, the protection user data.Verification process adopts PKI and SSL encryption technology, guarantees safety.Its verification process, as shown in Figure 7,
1, mail server login authentication server obtains authentication bill (Ticket);
2, mail server provides the authentication bill to system management server, shows own identity;
3, the authentication bill to mail server carries out authentication to system management server to the certificate server place;
4, authentication is passed through, and system management server provides required service to mail server.
Each each mail server of implementing in the territory of the present invention is corresponding with a mail domain, is used to store this mail domain user's mail, and route, network security, mail and homepage issuing etc. are provided.Fig. 8 is a mail server hardware components theory diagram of the present invention.As shown in the figure, mail server is to be the server of core with INTEL embedded X SCALE series network processing unit.INTEL XSCALE network processing unit is integrated three network processing engines design at network application specially.Pass through inner high speed bus close-coupled between network processing engine and the core CPU, thereby good network performance is provided.By such design, make packet handle in processor inside, improved network performance greatly; Its integrated level height, low in energy consumption, the components and parts of whole mainboard are compared with traditional X-ray 86 frameworks and are significantly reduced, and stability and time between failures are better than conventional architectures.
Mail server hardware comprises Memory Controller Hub, internal memory, expansion BUS, FLASH storage, real-time clock, serial ports controller, serial interface, debugging interface (for example JTAG), PCI32 interface, 10/100M network interface card, network interface, hard disk ide interface.The hard disk ide interface is connected on the PCI32 by the IDE chip of PROMISE, can connect ATA hard disk (as many as 200G), realizes memory function.Network interface drives by network interface card and is connected on the embedded MAC of XSCALE, utilizes network processing engine, carries out the express network data processing.
By such hardware designs, make mail server hardware possess the ability that data processing, storage, network packet are transmitted and filtered.After being pre-loaded into whole operation system and software environment on Flash and the hard disk, can realize the function that diverse networks such as network route, security protection, email storage forwarding are used.
When mail server is deployed in enterprise network inside, mail in the enterprise between the employee can directly transmit by Intranet at a high speed, speed is exceedingly fast, and the Internet that needn't be subject to low speed inserts, as shown in Figure 4, thereby, broken away from the fixedly dependence of public network IP, even do not have public network IP, not fixedly under the network condition of IP, mailing system still can operate as normal.The process that mail server handles postal matter as shown in Figure 9.Simultaneously, center mail forwarding server as enterprise oneself, preserve all mails on the own territory, both guaranteed that (mail only transmitted in intra-company for the safety of internal communication data, on public network, do not transmit), accelerated the speed of mail transmission/reception again, also alleviated the pressure (storage pressure and network pressure) of center mail forwarding server cluster, making center mail forwarding server cluster can serve as that more user provides service with lower cost.
Be that its hardware and software failure only influences the transmitting-receiving of the mail in oneself territory, to the operation of whole system and the not influence of data of other mail domain with mail server as another benefit of the center mail forwarding server of enterprises oneself.
Indulge the above, distributed E-mail system of the present invention has the advantage of following uniqueness:
(1), distributed storage
Mail data is left on the corresponding mail server, reduced memory requirement, disperseed risk, make data exception be reduced to minimum the influence of user data to center mail forwarding server.Simultaneously, utilize the relatively low mail server of cost to form distributed memory system, can erect huge storage networking.
(2) utilize virtual proprietary net and center mail forwarding server mail to transmit the mechanism that combines and carry out the transmitting-receiving of mail.
-center mail forwarding server is placed on IDC, has fixed public network IP address.Mail server is understood connection center mail forwarding server initiatively when inserting the Internet, and sets up a virtual proprietary net (VPN) tunnel with it.
-utilize virtual proprietary net, solved the technical barrier that can't realize center mail forwarding server under non-public network IP and the on-fixed IP situation.
-center mail forwarding server and all virtual proprietary nets of mail server composition.The mail server corresponding with each domain name is assigned to an implicit IP address.This IP address is used to locate the mail server of domain name correspondence fast when the mail forwarding server cluster forwarding by mail of center, so that quick forwarding by mail.
The use of-virtual proprietary net, having on the Internet of many restrictions, build the internal network of a free intercommunication, make center mail forwarding server can not be subjected to restriction at any time to the mail server forwarding by mail, thereby shortened the forwarding time of mail greatly such as equipment such as fire compartment wall, NAT.
(3) be applicable to variety of network environments, as ADSL, broadband, sub-district, special line etc.
(4) break away from the fixedly dependence of public network IP address, utilize VPN to realize and being connected of center mail forwarding server, data communication.Even do not have public network IP, not fixedly under the network condition of IP, mailing system still can operate as normal.
(5) diversify risks.
Utilize mail server to carry out the storage of mail, center mail forwarding server is forwarded to mail on the corresponding mail server automatically.The email storage of concentrating is converted into distributed storage, and the influence that Single Point of Faliure is brought is reduced to minimum, thereby has disperseed risk.Based on the center mail forwarding server cluster of distributed design, each takes charge of its duty, and the server that moves every kind of function all has redundant being equipped with, and has ensured running without interruption of service, has guaranteed service quality.
(6) be easy to expansion.
Can the equalizing system load based on the multicenter mail forwarding server of distributed design and many certificate servers framework, its disposal ability can be increased according to number of users, satisfy growing operation demand.
(7) mail virus protection and spam prevention.
Integrated anti-garbage mail system based on statistics and intelligent semantic analysis effectively filters spam on the mail server; Simultaneously integrated real-time virus protection system on center mail forwarding server and mail server, and keep online updating, mail virus is tackled.
(8) ID authentication mechanism of Ji Zhonging.
On certificate server, the service provider is unified on the certificate server the authentication in mail server and territory and carries out with mail domain authentication information storage and uniform in the present invention, and verification process adopts PKI and SSL technology to encrypt and authenticate, and guarantees authentication security
The above is specific embodiments of the invention and the know-why used, and is any based on the equivalent transformation on the technical solution of the present invention basis, all belongs within the protection range of the present invention.
Claims (6)
1. distributed E-mail system is characterized in that: it is implemented territories by system management server and several and constitutes, and each is implemented territory and links to each other with system management server by netting twine;
Each is implemented the territory and is made of main control server, a N center mail forwarding server, a N certificate server and N mail server; Each main control server of implementing the territory links to each other with system management server, main control server is hung N center mail forwarding server and N certificate server down, each center mail forwarding server is hung N mail server again down, and each mail server can connect N user;
Between main control server and the system management server, between center mail forwarding server and certificate server and the main control server, link to each other by the Ethernet netting twine between mail server and the user, link to each other by VPN(Virtual Private Network) between center mail forwarding server and the mail server, constitute distributed tree;
Described center mail forwarding server is responsible for the forwarding of mail, and the VPN request of receipt mail server realizes that mail server is not had the fixedly support of IP of public network;
Described center mail forwarding server is assigned fixed public network IP address;
Described mail server is assigned the implicit IP address that is used for forwarding by mail.
2. distributed E-mail system according to claim 1 is characterized in that: described mail server is used to store user's mail;
Each center mail forwarding server implementing in the territory can be transmitted the mail in N territory, and a mail server that links to each other with center mail forwarding server is corresponding with a kind of mail domain, is used to store a kind of mail domain user's mail.
3. distributed E-mail system according to claim 1 and 2 is characterized in that: described system management server is responsible for user's registration management, is prayed for expense, and the main control server administration interface is provided, and realizes the control of administration authority;
Main control server is in charge of the Servers-all in this enforcement territory, and to the management of user's domain name;
Certificate server mainly is responsible for user's authentication.
4. distributed E-mail system according to claim 3 is characterized in that: carry out the transmission of data by Virtual Private Network between described center mail forwarding server and the mail server, adopt udp protocol that the ECP/IP data are encapsulated.
5. distributed E-mail system according to claim 4 is characterized in that: the described mail server that is used to store mail is the network processing unit based on Intel embedded type CPU technology;
It is integrated with microprocessor, three network processing engines, Memory Controller Hub, internal memory, expansion BUS, FLASH storage, real-time clock, serial ports controller, serial interface, debugging interface, PCI32 interface, 10/100M network interface card, network interface, hard disk ide interface;
The hard disk ide interface is connected on the PCI32 by the IDE chip, can connect the ATA hard disk, realizes the storage of mass data; Network interface drives by network interface card and is connected on the 10/100M network interface card, utilizes network processing engine, carries out the express network data processing; Pass through inner high speed bus close-coupled between network processing engine and the CPU.
6. distributed E-mail system according to claim 5 is characterized in that: described mail server is the embedded X SCALE series network processing unit based on Intel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101654094A CN101163066B (en) | 2006-12-19 | 2006-12-19 | Distributed electronic mail system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101654094A CN101163066B (en) | 2006-12-19 | 2006-12-19 | Distributed electronic mail system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101163066A CN101163066A (en) | 2008-04-16 |
| CN101163066B true CN101163066B (en) | 2011-05-11 |
Family
ID=39297900
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006101654094A Expired - Fee Related CN101163066B (en) | 2006-12-19 | 2006-12-19 | Distributed electronic mail system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101163066B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101677324B (en) * | 2008-09-17 | 2012-10-03 | 华为技术有限公司 | Business management method, terminal, network system and related equipment |
| CN101383784A (en) * | 2008-09-28 | 2009-03-11 | 腾讯科技（深圳）有限公司 | Cross-region remote mail sending method and system |
| CN102036188B (en) * | 2009-09-24 | 2013-07-31 | 中国移动通信集团公司 | Mail proxy method, equipment and system under multi-node system |
| CN103139164B (en) * | 2011-11-29 | 2017-04-12 | 中国航天科工集团第二研究院七0六所 | Mail sending method and device based on classified information system |
| CN108989182A (en) * | 2018-06-22 | 2018-12-11 | 广州市风驰商汇信息科技有限公司 | A kind of E-mail address is established and memory space management |
| CN109669702A (en) * | 2018-12-03 | 2019-04-23 | 郑州云海信息技术有限公司 | A kind of system and method for realizing mail server distributed deployment |
| CN115022275A (en) * | 2022-06-22 | 2022-09-06 | 中国银行股份有限公司 | Distributed mail transfer method, device, system, equipment and storage medium |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1352429A (en) * | 2001-11-29 | 2002-06-05 | 上海复旦光华信息科技股份有限公司 | Centralized domain user authorization and management system |
| CN1652125A (en) * | 2004-02-02 | 2005-08-10 | 英业达股份有限公司 | LAN e-mail receiving and transmitting managing method and system thereof |
-
2006
- 2006-12-19 CN CN2006101654094A patent/CN101163066B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1352429A (en) * | 2001-11-29 | 2002-06-05 | 上海复旦光华信息科技股份有限公司 | Centralized domain user authorization and management system |
| CN1652125A (en) * | 2004-02-02 | 2005-08-10 | 英业达股份有限公司 | LAN e-mail receiving and transmitting managing method and system thereof |
Non-Patent Citations (2)
| Title |
|---|
| 刘彩虹：.Internet E-mail系统的开发研究.北京机械工业学院学报15 2.2000,15(2),全文. |
| 刘彩虹:.Internet E-mail系统的开发研究.北京机械工业学院学报15 2.2000,15(2),全文. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101163066A (en) | 2008-04-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101163066B (en) | Distributed electronic mail system | |
| CN101146051B (en) | An enterprise-level instant communication interconnection system and method for realizing enterprise interconnection | |
| CN105262738B (en) | A kind of method of router and its preventing ARP aggression | |
| CN103685467B (en) | A kind of Internet of Things interconnects platform and its communication means | |
| Wu et al. | Source address validation: Architecture and protocol design | |
| CN101964799B (en) | Solution method of address conflict in point-to-network tunnel mode | |
| CN101022340B (en) | Intelligent control method for realizing city Ethernet exchanger switch-in security | |
| CN101667918B (en) | Method and system for realizing cooperative work | |
| CN101651597B (en) | Deployment method of IPSec-VPN in address discrete mapping network | |
| CN106973053B (en) | The acceleration method and system of BAS Broadband Access Server | |
| CN201044458Y (en) | Step electronic mail system based on virtual special net and step storage mode | |
| CN105981347A (en) | System and method for preventing denial of service (DOS) attack on and for supporting reliable connection (RC) based on subnet administrator (SA) access in an engineered system for middleware and application execution | |
| CN104009972B (en) | The Verification System and its authentication method of network security access | |
| CN105337890B (en) | A kind of control strategy generation method and device | |
| CN104811370B (en) | A kind of security instant communication system framework based on mark | |
| US10868792B2 (en) | Configuration of sub-interfaces to enable communication with external network devices | |
| US10708299B2 (en) | Mitigating effects of flooding attacks on a forwarding database | |
| CN107888613A (en) | A kind of management system framework based on cloud platform | |
| CN101599904A (en) | The method and system that a kind of virtual dial-up safe inserts | |
| US20190286737A1 (en) | Synchronizing a forwarding database within a high-availability cluster | |
| CN101141396B (en) | Packet processing method and network appliance | |
| CN102833217B (en) | The processing method and centralized processing system of client/server application | |
| CN102170407B (en) | Method for realizing electronic mail credibility management on the basis of anti-fraud control logic unit | |
| CN103209107A (en) | Method for realizing user access control | |
| CN103944886B (en) | A kind of realization method and system of port security |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110511 Termination date: 20111219 |