CentOS Mail Server setup: Postfix, Dovecot, Virtual users, MySQL, SASL, Postfixadmin, TLS

I've compiled a cleaner guide for CentOS + Postfix + Virtual users + SASL + PostfixAdmin. At this moment it's not complete yet, it's missing SSL/TLS configuration for Dovecot and Postfix, i'll add it soon. Check the guide here.