/etc/default/iptables

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#
# Sample iptables rules. It should be localted at:
#   /etc/sysconfig/iptables
#
# Shipped within iRedMail project:
#   * http://iRedMail.googlecode.com/
#

*filter
:INPUT DROP [0:0]
:FORWARD DROP [0:0]
:OUTPUT ACCEPT [0:0]

# Keep state.
-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT

# Loop device.
-A INPUT -i lo -j ACCEPT

# http, https
-A INPUT -p tcp --dport 80 -j ACCEPT
-A INPUT -p tcp --dport 443 -j ACCEPT

# smtp, submission
-A INPUT -p tcp --dport 25 -j ACCEPT
-A INPUT -p tcp --dport 587 -j ACCEPT

# pop3, pop3s
-A INPUT -p tcp --dport 110 -j ACCEPT
-A INPUT -p tcp --dport 995 -j ACCEPT

# imap, imaps
-A INPUT -p tcp --dport 143 -j ACCEPT
-A INPUT -p tcp --dport 993 -j ACCEPT

# ssh
-A INPUT -p tcp --dport 22 -j ACCEPT

# Allow PING from remote hosts.
-A INPUT -p icmp --icmp-type echo-request -j ACCEPT

# ejabberd
#-A INPUT -p tcp --dport 5222 -j ACCEPT
#-A INPUT -p tcp --dport 5223 -j ACCEPT
#-A INPUT -p tcp --dport 5280 -j ACCEPT

# ldap/ldaps
#-A INPUT -p tcp --dport 389 -j ACCEPT
#-A INPUT -p tcp --dport 636 -j ACCEPT

# ftp.
#-A INPUT -p tcp --dport 20 -j ACCEPT
#-A INPUT -p tcp --dport 21 -j ACCEPT

COMMIT