Postfix quick Installation and Configuration guide

Postfix is the default message transfer agent (MTA) in Ubuntu. It is http://www.aliyun.com/zixun/aggregation/13835.html "> A software in the main software library of Ubuntu. This means that it has a security update. This guide tells you how to install and configure Postfix and set it up as an SMTP server that uses a secure connection.

Postfix Features:

1. Postfix is free: Postfix wants to function in a wide range of Internet users, trying to influence most Internet e-mail systems, so it's free.

2. Faster: Postfix is about three times times faster in performance than SendMail. A desktop PC running Postfix can send and receive millions of emails a day.

3. Good compatibility: Postfix is sendmail compatible so that sendmail users can easily migrate to postfix. Postfix supports/var[/spool]/mail,/etc/aliases, NIS, and ~/.forward files.

4. More robust: Postfix is designed to work properly under heavy load. Postfix automatically reduces the number of running processes when the system is running beyond available memory or disk space. When the number of messages processed increases, the postfix running process does not increase.

5. More flexible: Postfix is made up of more than a dozen small programs, each of which accomplishes specific functions. You can set the running parameters for each program through the configuration file.

6. Security: Postfix has a multi-layered defense structure that can effectively withstand malicious intruders. If most of the Postfix programs can run under lower privileges, you cannot access security-related local delivery programs, and so on.

Installation

Install the postfix with SMTP-AUTHT and TLSR using the following command:

Apt install postfix libsasl2 sasl2-bin libsasl2-modules libdb3-util procmail
Apt install postfix libsasl2-2 sasl2-bin libsasl2-modules db4.6-util procmail