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