In this section, we will take a look at how to obtain and install Postfix as well as how to make basic configuration changes. By the end of this section, you will be able to use Postfix to send and receive e-mail messages.
There are two separate branches of Postfix development—the official release and the experimental release. The official release is sometimes referred to as the stable release, but that is somewhat misleading as it implies that the experimental release is unstable. That is not the case. The experimental release is used to introduce all new Postfix features. When the implementations of the features and their interfaces (for example, their configuration parameters) have stabilized sufficiently, they are brought into the official release. Normally, the only changes made to the official release are bug fixes and fixes for portability problems.
The experimental release is usable in production environments, but the...