The following lines were added (+) and removed (-):
== references and sources ==* [http://ostechnix.wordpress.com/2013/02/08/setup-mail-server-using-postfixdovecotsquirrelmail-in-centosrhelscientific-linux-6-3-step-by-step/ Setup Mail Server using Postfix, Dovecot and SquirrelMail in CentOS/RHEL/Scientific Linux 6.3 step by step by Senthilkumar P]