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This article introduces how to use linux to build a mail server for the company to reduce costs and increase efficiency, the content is very detailed, interested friends can refer to, hope to be helpful to you.

In an enterprise, it is much easier to save a penny than to earn a penny. This is one of the famous sayings that guide enterprises to reduce costs and increase efficiency. As an IT staff in an enterprise, I have deep feelings, especially in terms of IT, except that Internet companies are in the vanguard of productivity, in manufacturing units, it is generally the logistics support department, not only can not directly create value for the production and manufacturing of enterprises, but also spend the company's money. Although this situation has improved in domestic front-line large companies, the IT of domestic small and medium-sized enterprises is still a saving-oriented department. Under this background, the contract of the company's mail server expired a few days ago, and Party B has increased the price for the system upgrade service next year. As a result, the leaders of the company did not renew the contract, and at the same time, the task of building a new mail server fell to the IT department.

Because Party B gave us a self-built server before, but we were only responsible for the user management of the web background, as to what the server is, what is the internal principle of the system, and we are not very clear about the software used, so we started a bad fix. Here I also record the process in the middle and learn with you.

Mail system city company external contact, network communication is an important way, if the use of windows server and its related software, software and hardware investment is relatively large, which is not in line with our principle of reducing cost and increasing efficiency. And the stability and security of the system are not very good, so we consider using the linux system as the operating system of the mail server, because it is widely used, free, efficient and relatively secure. Build a mail system platform through sendmail, and combine dovectot and pop3/IMAP as well as Outlook and foxmail of client point to achieve client software access and browser web access, which not only meets the requirements of the company, but also reduces the cost.

E-mail service is based on the client / server model, for a complete e-mail system, it mainly consists of the following parts.

1. E-mail user agent, user agent is the interface between the user and the e-mail system. MUA is the acronym of Mail User Agent. In most cases, MUA is a program that runs on the e-mail client, which is mainly responsible for sending mail to the mail server, how to download mail from the mail server, and can edit the content of the mail on your own computer. At present, we mainly use the Outlook that comes with the system and the domestic boss foxmail.

two。 Mail server, mail server is the core component of e-mail system, its main function is to send and receive e-mail, colleagues report the transmission of e-mail to the sender, according to the use of the mail server can be divided into launch mail server also known as SMTP server, and receive mail server also known as POP3 or IMAP server. At the same time, there are two independent processes running on the e-mail server: the mail transfer agent should be abbreviated as MTA, the mail distribution agent should be abbreviated as MDA, and the mail transfer agent (MTA) process is used to send e-mail. MTA receives information from MUA or MTA on another e-mail server. Based on the content of the message header, the MTA decides how to send the message to the destination. If the mail destination is on the local server, then the message will be sent to MDA,MDA Black to solve the final delivery problem. If the mail server is not on the local server, MTA will send the email to the MTA on the corresponding server.

3. For the protocols used in e-mail, the realization of e-mail services must rely on special protocols. At present, the main protocols between applications and e-mail services are SMTP,MIME,POP3 and IMAP protocols. When users write an email, they often use the MUA application, or through the e-mail client program. Through the MUA program, you can send mail or save the received mail to the mailbox of the client.

There are many mail servers to choose from in the linux platform, but the most commonly used servers are Sendmail server, Postfix server and Qmail server. The Sendmail server is the mail server that comes with RedHat Linux and is installed by default. RedHat is the leader in the linux system, stable and secure, so this time the server operating system chose RedHat.

Because there is a lot of code, it is difficult to control the layout simply writing here. So I'll talk to my friends briefly.

First of all, it is necessary to smooth the network, which is the basis for the company's mail server to accept mail from external sources, there must be a public network IP and domain name, and the resolution of DNS is done by the ISP service provider. However, if you send mail within the company, you still need to set up the local DNS on the mail server. The second part is to install and configure the Sendmail server. When installing REHLserver, you should choose to install it completely, so that Sendmail can be installed together. A lot of specific installation code is not written here, in the entire mail system, the Sendmail server only provides SMTP services, that is, mail forwarding and local distribution, to achieve a mail server not only as a mail sending server, but also to save mail, but also to install POP3 and IMAP services. Usually, SMTP service and POP3 service are installed on one host. In REHL system, dovecot software can provide POP3 and IMAP service at the same time. After the completion of the above two services, the e-mail client can use this e-mail server to send and receive mail. At the same time, don't forget to configure the security configuration of the relevant users on Sendmail. After the corresponding configuration is made on the Outlook or foxmail client on the windows platform, a complete email sending and receiving system is completed.

On how to use linux to build a mail server for the company to reduce costs and increase efficiency is shared here, I hope the above content can be of some help to you, can learn more knowledge. If you think the article is good, you can share it for more people to see.

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