This one simple rule in my iptables script allowed port 587 SMTP traffic back into my network.
iptables -I INPUT -m state –state RELATED,ESTABLISHED -j ACCEPT
From the screenshot below, I could see the port was being blocked. The rule above fixed it.
Image may be NSFW.
Clik here to view.
The post Allowing SMTP traffic back into a network – IPtables Linux appeared first on 916 Networks.
