Hi,

I am puzzled.

I cannot receive or send email when I have IP table on, except to Yahoo.com.  I get bounded emails when trying to send.  

As soon as I stop IPTables I start receiving emails. 

CentOS 6.4, Postfix, dovcott, Spamassassin, virtual host server running on my business cox account (no blocked ports).

Router ports that are open 21,22,25,53,80,143,443,587. (port forwarding)

IPTable config:

# Generated by iptables-save v1.4.7 on Fri Mar 29 14:08:56 2013
*filter
:INPUT DROP [0:0]
:FORWARD DROP [0:0]
:OUTPUT ACCEPT [4:432]
-A INPUT -s 192.168.20.0/24 -p tcp -m tcp --dport 22 -j ACCEPT
-A INPUT -s x.x.x.x/32 -p tcp -m tcp --dport 22 -j ACCEPT
-A INPUT -s x.x.x.x/32 -p tcp -m tcp --dport 22 -j ACCEPT
-A INPUT -p tcp -m tcp --dport 25 -j ACCEPT
-A INPUT -p tcp -m tcp --dport 53 -j ACCEPT
-A INPUT -p tcp -m tcp --dport 80 -j ACCEPT
-A INPUT -p tcp -m tcp --dport 143 -j ACCEPT
-A INPUT -p tcp -m tcp --dport 443 -j ACCEPT
-A INPUT -p tcp -m tcp --dport 587 -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
COMMIT
# Completed on Fri Mar 29 14:08:56 2013


Thank you for any insight.
Keith

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Keith Smith