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1. Postfix
Postfix is the default Mail Transfer Agent (MTA) in Ubuntu. It attempts to be fast and easy to administer and secure. It is compatible with the MTA sendmail. This section explains how to install and configure postfix. It also explains how to set it up as an SMTP server using a secure connection (for sending emails securely).
This guide does not cover setting up Postfix Virtual Domains, for information on Virtual Domains and other advanced configurations see Section 1.7.4, “References” [p. 268].