Postfix
From Christoph's Personal Wiki
Postfix is a free software / open source mail transfer agent (MTA), a computer program for the routing and delivery of email. It is intended as a fast, easy-to-administer, and secure alternative to the widely-used Sendmail MTA.
Base configuration
The main.cf file stores site specific Postfix configuration parameters while master.cf defines daemon processes. The Postfix Basic Configuration tutorial covers the core settings that each site needs to consider.
Configuration settings for a few common environments are discussed in Postfix Standard Configuration Examples.
Address rewriting and mail routing are covered in Postfix Address Rewriting. The full documentation collection is at Postfix Documentation.
Examples
postalias /etc/postfix/aliases
Then create /etc/postfix/aliases.db
postfix reload postconf -n postfix check
Utilities
postalias- Postfix alias database maintenance
postcat- show Postfix queue file contents
postconf- Postfix configuration utility
postconf- Postfix configuration parameters
postdrop- Postfix mail posting utility
postfinger- Postfix configuration extraction utility
postkick- kick a Postfix service
postlock- lock mail folder and execute command
postlog- Postfix-compatible logging utility
postmap- Postfix lookup table management
postqueue- Postfix queue control
postsuper- Postfix superintendent
