Relay all mail to ISP SMTP Server

In my case, i enabled port 26 and get my clients to change it.

Good luck.
 
dannygoh,

seems like you have notice this after TMNet has blocked port 25 early this year.

Please remove the changes you have done. The instructions given by TMNet is IF your mail server is behind their network and make use of their SMTP to send out email.

Your directadmin is NOT behind their network. So you dont have to do that. What you need to do now is to open a connection on port 26.

Do this via iptables.
iptables -A PREROUTING -t nat -p tcp --dport 26 -j REDIRECT --to-port 25
Click to expand...

After which, configure your outgoing SMTP to port 26.

Hope this helps.
 
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