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[SOLVED] Forwarding

Posted: Wed Mar 23, 2011 8:29 am
by andras.babos
Dear all,
I have the following situation.
I have an firewall in fornt of zimbra apliance.

I forward all request to port 25 to the zimbra apliance but zimbra doesen't respond.
Here the firewall rule.
-A PREROUTING -d RealIP -p tcp -m tcp --dport 25 -j DNAT --to-destination

-A POSTROUTING -s -p tcp -m tcp --dport 25 -j SNAT --to-source RealIP
Where is the ip of zimbra apliance.
If I send an telnet comand to ip por 25 from local network (192.168.0.x) the zimbra apliance it's alive:
telnet 25


Connected to

Escape character is '^]'.

220 ESMTP Postfix
I'm sure that the firewall it's ok because I use iperf to emulate port 25 to another host and it's work the firewall rule.
Can anyobdy explain me what I nett to change in postfix configuration file to work.
Thaks for support