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Exchange 2003 Front end to back end message relaying

Posted on 2004-08-04
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Last Modified: 2010-04-11
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 xxx@xxx.com

Any ideas?


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

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Question by:PipeLinePCs
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by:PipeLinePCs
ID: 11727031
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.

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