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 email@example.com it arrives in the administrator mailbox as the old recpient from site A.
If anyone can make sense of this please do respond