Exchange 2000 mail loops on multiple domains

Wonder if anyone can help with a weird one;

Had an existing single domain in Exchange 2000 working fine for ages, and the client requested adding an additional two domains - all send/receive on smtp. Iadded the accounts in the MS approved manner, and now have no in mail at all - messages are bounced to sender with either "maximum hops exceeded - may indicate a mail loop" or "user doesn't exist"

I suspect (as stated) that I have a mail loop on my hands, but cant find any resources to assist - can anyone offer a torch please?
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chrisalisAsked:
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NetminderCommented:
User resolved; points (500) refunded and question closed.

Netminder
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andyalderCommented:
You need to ask community Support to move this question to http://experts-exchange.com/Networking/Email_Groupware/Exchange_Server/ rather than under storage.
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chrisalisAuthor Commented:
Thanks Andy - most of the Exchange responses I searched for were coming up under storage (for some reason) so I posted here  - will do it now
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sir_flexalotCommented:
Does the client have email forwarding set up on their addresses?
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chrisalisAuthor Commented:
No forwarding - however, I have managed to sort this problem out - user error to a degree; user advised me that all relevant patches/updates had been applied to the exchange install; when I examined it in detail (in person) it stood at sp1 for exchange. I've updated to the current sp and all systems ok now.

Thanks to all contributors - have requested community support remove question.
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