Exchange 2003 Front end to back end message relaying

ok I am starting to set up for a major rollout for a client.
All servers will be Exchange 2003 on Windows 2003 server.

First server was setup just to get started, il1-2k3-04, smtp connector to relay any non-migrated mail back to the old ISP email system. Everything works fine.

I installed a frontend server in the DMZ, Set backend SMTP virtual server smart host to the front end. Moved bridge head for old isp relay to front end server.
All out going mail works great. Untill there untill we try to have mail routed from the front end to the back end, at which point we get a Diagnostic-Code: smtp;550 5.7.1 Unable to relay for

Any ideas?

P.S.  Firewall is wide open between DMZ and internal for this address.

Who is Participating?
moduloConnect With a Mentor Commented:
PAQed with points refunded (50)

Community Support Moderator
PipeLinePCsAuthor Commented:
Never mind, I found the answer to this.

I am not very cisco savy. It turns out that when I asked our Cisco tech to open everything he forgot about the fixup for smtp. Exchange uses a lot more commands when talking to other exchange servers which requires the fixup to be turned off. Unfortunately the smtp fixup is either on or off for the entire firewall. It would be nice to be able to aply it to the outside and remove it from the inside interface on the same hardware.

Thanks anyway, I was begining to think I was loosing my mind.

We will have to live with the fixup being off on the firewall utill Cisco changes how fixups are aplied.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

All Courses

From novice to tech pro — start learning today.