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POHow to allow mail through iptables?
 

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    <p>I'm securing my server (with iptables) so that only http and ssh ports are open and that is fine, although I use the <code>mail</code> command (server: CentOS 6.2) in some applications and it does not get through now thanks to iptables blocking everything.</p> <p>What ports do I allow it access to?</p> <p>Mail usage: <code>echo "{{message}}" | mail -s "{{subject}}" me@mail.com</code></p> <p>I've tried the standard mail port 25, but I have had no success with that. Here is the current setup:</p> <pre><code>iptables --flush iptables -P INPUT DROP iptables -P OUTPUT DROP # incoming ssh iptables -A INPUT -i eth0 -p tcp --dport 22 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A OUTPUT -o eth0 -p tcp --sport 22 -m state --state ESTABLISHED -j ACCEPT # outgoing ssh iptables -A OUTPUT -o eth0 -p tcp --dport 22 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A INPUT -i eth0 -p tcp --sport 22 -m state --state ESTABLISHED -j ACCEPT #HTTP iptables -A INPUT -i eth0 -p tcp --dport 80 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A OUTPUT -o eth0 -p tcp --sport 80 -m state --state ESTABLISHED -j ACCEPT # mail (does not work) iptables -A INPUT -i eth0 -p tcp --dport 25 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A OUTPUT -o eth0 -p tcp --sport 25 -m state --state ESTABLISHED -j ACCEPT </code></pre> <p><strong>(EDIT) ANSWER: The working iptables rule:</strong> </p> <pre><code>iptables -A OUTPUT -o eth0 -p tcp --sport 25 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A OUTPUT -o eth0 -p tcp --dport 25 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A INPUT -i eth0 -p tcp --sport 25 -m state --state ESTABLISHED -j ACCEPT </code></pre>
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