[geroshea]

Apologies for not replying sooner, was away.
Anyway yes it seems to be some problem on our Firewall, I have that test server on our DMZ and i have portforwarding setup for various ports.
From a host on my private network if I (telnet my_public_ipaddress 7025) I can connect no problem, but if I (telnet my_public_ipaddress 7025) from a Host or Zimbra server on my DMZ - connection times out.

I am waiting for Firewall support to come back to me with a reason as to why this is not working.

I take your suggestion of setting up a relay host (with ISP) but don't really want to go down this road, as i'm sure we won't have any logs ( I think logging information will be recorded on our ISP SMTP server then.

Thank you for replying to my post.
I will post back here again when our firewall guys get back to me(Hopefully today).

Cheers

Ger.