Postfix/virtual

About
virtual is Postfix's mail delivery agent for virtual users. Originally based on the Postfix local delivery agent, virtual looks up recipients with map lookups of their full recipient address, instead of using hard-coded unix password file lookups of the address local part only.

Configuration
in main.cf:
 * virtual mailbox domains
 * virtual mailbox maps
 * virtual transport

Reference

 * postfix.org
 * postfix.org