Linux: Iptables # 16 How to allow secure mail SMTPS?

in Categories News last updated July 25, 2005

Secure SMTPS uses the tcp port 465 by default. Following iptable rules will allow server SMTPS incoming client request (open port 465) for server ip address 202.54.1.20:
iptables -A INPUT -p tcp -s 0/0 –sport 1024:65535 -d 202.54.1.20 –dport 465 -m state –state NEW,ESTABLISHED -j ACCEPT

iptables -A OUTPUT -p tcp -s 202.54.1.20 –sport 465 -d 0/0 –dport 1024:65535 -m state –state ESTABLISHED -j ACCEPT

Following rules allows SMTPS outgoing client request from firewall host 202.54.1.21 (open port 465):
iptables -A OUTPUT -p tcp -s 202.54.1.21 –sport 1024:65535 -d 0/0 –dport 465 -m state –state NEW,ESTABLISHED -j ACCEPT

iptables -A INPUT -p tcp -s 0/0 –sport 465 -d 202.54.1.21 –dport 1024:65535 -m state –state ESTABLISHED -j ACCEPT

Posted by: Vivek Gite

The author is the creator of nixCraft and a seasoned sysadmin, DevOps engineer, and a trainer for the Linux operating system/Unix shell scripting. Get the latest tutorials on SysAdmin, Linux/Unix and open source topics via RSS/XML feed or weekly email newsletter.

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