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This article mainly introduces "how to install and configure Postfix in Linux to build mail sending service". In daily operation, I believe many people have doubts about how to install and configure Postfix in Linux to build mail sending service. Xiaobian consulted all kinds of materials and sorted out simple and easy-to-use methods of operation. I hope it will be helpful to answer the doubt of "how to install and configure Postfix in Linux to build mail sending service". Next, please follow the editor to study!

Install Postfix

Postfix is a MTA (Mail transfer Agent) software developed by Wietse Venema under the GPL protocol of IBM. Postfix is an attempt by Wietse Venema to provide an alternative to the most widely used sendmail. In the Internet world, most e-mail is delivered through sendmail, and about 1 million users use sendmail to deliver hundreds of millions of emails every day. This is really an amazing number. Postfix tries to be faster, easier to manage, more secure, while maintaining sufficient compatibility with sendmail.

(why use postfix:

1. Postfix is free:

Postfix wants to work for a wide range of Internet users, trying to influence most e-mail systems on Internet, so it's free.

two。 Faster:

Postfix is about three times faster than sendmail in performance. A desktop PC running postfix can send and receive millions of emails a day.

3. Good compatibility:

Postfix is sendmail compatible, making it easy for sendmail users to migrate to postfix. Postfix supports / var[ / spool] / mail, / etc/aliases, NIS, and ~ / .forward files.

4. More robust:

Postfix is designed to work under heavy loads. When the system runs beyond the available memory or disk space, postfix automatically reduces the number of running processes. As the number of messages processed increases, the number of processes that postfix runs does not increase.

5. More flexible:

Postfix is made up of more than a dozen Mini Program, each program performing specific functions. You can set the running parameters of each program through the configuration file.

6. Security.

Postfix has a multi-layer defense structure, which can effectively resist malicious intruders. For example, most postfix programs can be run under low permissions and cannot access security-related local delivery programs through the network, and so on. )

The Postfix is now almost standard for MTA (Mail Transfer Agent). But before it, Sendmail was standard. So in some older system versions, you need to remove Sendmail when installing Postfix. If your system already has Postfix installed, you can skip this step.

Use the following command to view the MTA used by the system:

The code is as follows:

Alternatives-display mta

Delete Sendmail

The code is as follows:

Sudo yum remove sendmail

Install Postfix

The code is as follows:

Sudo yum install postfix

Set Postfix to MTA

The code is as follows:

Sudo alternatives-set mta / usr/sbin/sendmail.postfix

Configure Postfix

Edit the configuration in the / etc/postfix/main.cf file as follows:

The code is as follows:

Myhostname = mail.dyniao.com # Host name

Mydomain = dyniao.com # the primary domain name of the mail server

Myorigin = $mydomain # the domain name shown in the send email

Inet_protocols = ipv4 # supported network protocols

The above configuration is only the smallest configuration I can run during testing, please do not use it in formal situations or production environments.

Start Postfix:

The code is as follows:

Sudo service postfix start

Have Postfix support boot:

The code is as follows:

Sudo systemctl enable postfix.service

Domain name configuration

By completing the above steps, you can send mail to any mailbox. But usually it can only be found in each other's dustbin. To avoid this situation, you also need to configure the host for domain name resolution so that the receiving server trusts the received mail. The steps are as follows:

Add an A record, set the domain name for the mailbox, such as mail.zzxworld.com, and point to the host ip.

Add a MX record and point to the email domain name you added in the first step.

Add a TXT record with a record value of:

The code is as follows:

V=spf1 a mx ~ all

The record value above indicates the use of SPF (Sender Policy Framework) to prevent others from falsifying emails.

After the domain name resolution takes effect, you can send mail from the host normally.

At this point, the study on "how to install and configure Postfix in Linux to build mail sending service" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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