Configure advanced mail services

Install and start sendmail:
	yum install sendmail -y
	service sendmail start
	chkconfig sendmail on

Open firewall port 25:
	nano /etc/sysconfig/iptables
	-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 25 -j ACCEPT
	service iptables restart

Install rpocmail adn spamassassin
	yum install procmail spamassassin -y
	service spamassassin start
	chkconfig spamsassissin on
	

Configure procmail recipies for spamassassin:
	# By using the f and w flags and no condition, spamassassin is going add the X-Spam headers to every single mail, and then process other recipes.
	# No lockfile is used.
	:0fw
	| /usr/bin/vendor_perl/spamc

	# Messages with a 5 stars or higher spam level are going to be deleted right away
	# And since we never touch any inbox, no lockfile is needed.
	:0
	* ^X-Spam-Level: \*\*\*\*\*
	/dev/null

	# If a mail with spam-status:yes wasn't deleted by previous line, it could be a false positive. So its going to be sent to an spam mailbox instead.
	# Since we don't want the possibility of one procmail instance messing with another procmail instance, we use a lockfile
	:0:
	* ^X-Spam-Status: Yes
	$HOME/mail/Spam

Install and configure dovecot:
	yum isntall dovecot -y
	service dovecot start
	chkconfig dovecot on

Open dovecot ports in iptables:
	nano /etc/sysconfig/iptables
	-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 110 -j ACCEPT
	-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 143 -j ACCEPT
	service iptables restart