Here’s a quick IPTables rule to setup an alternate non-standard SMTP port without reconfiguring the mail server software:
|
1 2 |
/sbin/iptables -t nat -A PREROUTING -p tcp -m tcp --dport 2525 \ -j REDIRECT --to-ports 25 |
Alternate SMTP Port
Have a project or a problem?
Talk with a senior engineer for practical recommendations—no obligation.
Leave a comment
Related Posts
Reliable Penguin provides managed web hosting, systems administration, website and server migrations, and expert consulting.
Recent Updates
March 5, 2026
February 25, 2026
February 25, 2026
