How to allow secure mail SMTP ports at the firewall?

Guys,

Following iptables rules will allow server SMTPS incoming client request (open port 465) for server ip address "server_IP" :

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#iptables -A INPUT -p tcp -s 0/0 --sport 1024:65535 -d server_IP --dport 465 -m state --state NEW,ESTABLISHED -j ACCEPT
#iptables -A OUTPUT -p tcp -s server_IP --sport 465 -d 0/0 --dport 1024:65535 -m state --state ESTABLISHED -j ACCEPT
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Note : Please replace the server_IP with your server's IP address where mail server has setup.

Try :)