• Mail Server Setup With Exim, MySQL, Cyrus-Imapd, Horde Webmail On Centos 5.1 | HowtoForge
  This guide describes the installation and configuration of a mail system on Centos 5.1 with SELinux enabled for enhanced security. This system will be able to service HTTP, HTTPS, SMTP, TLS, SMTP-AUTH, IMAP, POP3 clients and is virtual enabled allowing more than one domain to be served from the system.
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• 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. 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.
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