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domain DNS issues

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Last Modified: 2010-04-20
I have 2 sites, both running sbs2003.  site A had email domain @sitea.co.uk this email domain was moved to site b.  So site A has @newdomain.co.uk, site B has @sitea.co.uk.  Site A and B have local DNS domain names  different from the external domain names.  The following error occurs when sending emails from site A to site B.  

A configuration error in the e-mail system caused the message to bounce between two servers or to be forwarded between two recipients. Contact your administrator.

When I ping sitea.co.uk from site A it resolves to its old external IP address, if I ping anywhere from the outside then it resolves to its new IP correctly.

I am presuming the issue is that site A still thinks that sitea.co.uk still resides on site A server, which it doesnt.  I've cleared out DNS cache and removed all trace of the domain in the exchange recipients policy.

It gets even stranger!! When I send an email from site B to administrator@newdomain.co.uk it arrives in the administrator mailbox as the old recpient from site A.

If anyone can make sense of this please do respond
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