Mail server explanation
What is a mail server? The mail server provides the basic structure of the mail system, including mail transfer, mail distribution, mail storage and other functions to ensure that mail can be sent to any place on the Internet. Currently, mail servers have two different application groups: ISP providers and enterprises. Email is one of the Internet application services. Through the network, you can communicate with any online user in the world at a very low price and very fast. These emails can contain text, images, sounds or other multimedia information.
Mail Server Technical Overview
Web-spam technology.
According to the latest China Internet Network Development Statistics Report released by China Internet Network Information Center (CNNIC) in January 2003, there are currently more than 20 million Internet users in China, of which 95.07% regard email as the most common. The Internet service used has an average of 3.24 email accounts per person, with an average of 16.82 emails per week and 9.05 emails. With the increasing popularity and gradual deepening of Internet applications in China, these numbers are still growing. However, for the e-mail system, simply using the mail client program to send and receive mail can not meet the needs of the user's mobile office. The emergence of Web mail technology completely solves the needs of users' office, so that mail users can use any browser to log in to the mail server to send and receive mails without using the mail client program.
Multi-domain mail service.
The so-called multi-domain mail service, that is, a physical server provides e-mail services for enterprises or organizations that independently register Internet domain names. Logically, these enterprises and units have their own independent mail servers, which can also be called For virtual mail server technology. For ISP providers and enterprise group companies, the ability to support multi-domain mail servers is an important consideration in choosing a mail server. It can easily extend its horizontal mail service capabilities.
Linux mail server.
Linux operating system is currently the most widely used open source operating system, with stable performance, high reliability and low price. Using Linux as a mail server, it can be used together with open source software such as Sendmail and MySQL to reduce the system price based on user requirements. //This article from the application of computer hardware and software network www.45it.com reproduced please specify
mail server basic processing requirements
on mail server security
current mail server security technology With the improvement, many security technologies including data authentication, transmission encryption, spam filtering, mail virus filtering, security auditing, etc. have been well applied in the mail server.
mainly refers to SMTP authentication letter certified mail server for this feature is an optional feature, the main purpose is to prevent hackers using your own server to attack other mail servers. Perfecting SMTP identity authentication can not only stop the bad behavior of hackers, but also ensure that the various resources of your mail server can be fully applied to the daily mail processing process without causing server system crash and resource waste.
either POP3 or SMTP protocol agreement, because of its weaknesses in the design of the beginning of all messages in plain language is passed, it is easy to cause leakage of information. We can improve system security in two ways: link encryption and end-to-end encryption. Link encryption is the use of encryption tools (software and hardware tools) to encrypt the transmitted lines, which requires the support of network facilities. End-to-end encryption is the encryption of the mail client to the mail client. It is a function that the mail server should provide. The current popular method is to use SSL/TLS for transmission encryption. Most of the spam is publicity items such as commercial advertisements. It is estimated that for commercial spam alone, the cost of productivity offset by each spam is around $1. The cost of Internet access and telephone bills for downloading spam alone will cost the global Internet users $9.4 billion annually. In addition, many viruses and ID card and credit card theft cases are also related to spam. Therefore, we need the mail server to have spam handling capabilities to protect against most spam attacks. Hacker attacks and viruses are originally two relatively independent technology systems, but with the continuous development of the network, network tools and viruses are becoming more and more integrated. For example, the Nimda virus is both a virus and a way of network attacks. The use of a wide range of emails has also become one of the main ways of spreading viruses. Currently, most mail servers have basic virus protection capabilities.
Multi-language processing capability of mail server
At present, there are several character sets in Chinese mail server, such as GB-18030, GB-2312, Big5, etc., although we can unify the standard, but in actual In the process, we can't unify all mail clients, so we can only ask the mail server to support multi-language environment, so that "our communication is accessible."
mail server for remote monitoring and performance tuning
due to the present, many mail servers hosted in the telecommunications, etc., local operation is not always possible, so the current mail server offers a remote mail monitoring. We can monitor the working status of the mail server through the web, including the number of online users, the number and speed of mail processing, the storage space usage, etc., and can remotely process the emerging sending peaks and network attacks at any time.
unlimited scalability
e-mail system should have unlimited scalability, a feature of the Internet is constantly changing, we need to respond to the application at any time from the peak. Therefore, we need the e-mail system to have unlimited scalability, this ability is mainly reflected in the processing power of mail and the storage capacity of mail. In order to enable the mail processing capability to be expanded indefinitely, clustering and load balancing technologies need to be introduced, so that the application platform can be expanded infinitely when needed to meet long-term or temporary business needs. For mail users with more than 20 million, the number of mails sent every day is at least tens of millions. In order to facilitate mail storage, high-performance mail storage solutions are needed. The most ideal one should be the application of SAN technology in the mail server field.