macro.pop3

sharewall is very good

#
# Shorewall version 4 - POP3 Macro
#
# /usr/share/shorewall/macro.POP3
#
#	This macro handles plaintext POP3 traffic.  For encrypted POP3,
#	see macro.POP3S.
#
###############################################################################
#ACTION	SOURCE	DEST	PROTO	DEST	SOURCE	RATE	USER/
#				PORT(S)	PORT(S)	LIMIT	GROUP
PARAM	-	-	tcp	110
#LAST LINE -- ADD YOUR ENTRIES BEFORE THIS ONE -- DO NOT REMOVE