Exchange email

I have exchange server 2003 with five companies receiving email from their own domain addresses.  One of these companies was recently removed from the exchange server and cannot receive any email from any of the other companies that are on the exchange server.  I have deleted the domain and all user accounts from the network but when the email address is typed into outlook it still points to our server.  There must be a trace of that domain left somewhere in exchange and I can't find it.  

Any help would be appreciated.
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redseatechnologiesConnect With a Mentor Commented:
That is a common problem, with a detailed solution here;


Forced accept.

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