macro.mail

sharewall is very good

#
# Shorewall version 4 - Mail Macro
#
# /usr/share/shorewall/macro.Mail
#
#	This macro handles SMTP (email secure and insecure) traffic.
#	It's the aggregate of macro.SMTP, macro.SMTPS, macro.Submission.
#
#	Note: This macro handles traffic between an MUA (Email client)
#	and an MTA (mail server) or between MTAs. It does not enable
#	reading of email via POP3 or IMAP. For those you need to use
#	the POP3 or IMAP macros.
#
###############################################################################
#ACTION	SOURCE	DEST	PROTO	DEST	SOURCE	RATE	USER/
#				PORT(S)	PORT(S)	LIMIT	GROUP
PARAM	-	-	tcp	25
PARAM	-	-	tcp	465
PARAM	-	-	tcp	587