Multiple domains on single exchange - different problem 1

[bigkeith]

Hi all,
We have a problem trying to add a further domain to our exchange server. We currently receive emails from 3 of our domains into our exchange server and now wish to add a fourth.
We have had the MX records changed to point to our server, which we have tested and proved are correct via messagelabs - who intercept emails and check for spam/virus'. I have also changed the default recipient policy and added in the new domain. If I send an email internally to the newly added email address it is delivered ok. If, on the other hand I send an email to that address form an external source I get a 551 Bad Recipient error.
I have selected 'Applied this policy now' on the default recipient policy. I have done an 'Update Now' on the Recipient Update Service and I have also restarted the whole exchange server, but I still get the same error?

We have about exhausted our avenues on this problem and really need to resolve this, for obvious reasons.

Any help would be greatly appreciated.

Keith

 

[paulha]

Check the account in ADUC, does the address that you are sending to appear in the email addresses list in the user account properties ?

 

[bigkeith]

Hi paulha,
Yep, I've created the email address for the account in ADUC. I even copied and pasted it, just in case my old eye / finger combination is introducing an error somewhere.

Keith

 

[paulha]

Try running through these two ?

http://support.microsoft.com/kb/268838

http://support.microsoft.com/kb/260973

 

[bigkeith]

Thanks again paulha,I have already followed both of your suggested links - to no avail.

I have just completed a further technical call to Messagelabs, who have said there might me an issue with the forwarding from their towers onto our domain - although the tests they did yesterday showed no problems. I'm hoping a simple change their side will fix our problem, which now looks like the likely culprit.

For now I feel we might be near to a solution, which I will post if it is the case. Therefore, rather than waste anybody's time further it's probably best to hold on with this problem.

Many thanks

Keith