Postfix Admin is a web-based GUI for setting up mail users for a Postfix+MySQL setup.
It will let you create users and aliases per domain.
This HOWTO goes over install Postfix Admin, Postfix with a MySQL backend and SMTP auth enabled, and Dovecot (for POP3/POP3/IMAP/IMAPS) with a MySQL backend.
While this HOWTO is based on Debian Etch, the Postfix/MySQL setup is generic and should work fine on most distributions.
If you're after per-user spam and virus filtering for your virtual users, see the howto here: http://bliki.rimuhosting.com/space/knowledgebase/linux/mail/postfix+with+amavis+and+mysql
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