Howtoforge posted a guide about setting up a mail server using Exim4, Clamav, Dovecot, SpamAssassin and many more on Debian
This howto describes one way to build a scalable, secure, full-featured mail platform.Setting Up A Mail Server Using Exim4, Clamav, Dovecot, SpamAssassin And Many More On Debian
It offers virtual hosting of mailboxes in maildir format with support for quotas and server-side filtering, domain aliasing, address aliasing, address forwarding, catchall addresses. Relaying is secured with STARTTLS and SMTP-AUTH. Incoming mails are checked for viruses, spam, and checked against SPF policy and DNSBL.
