ASKER
imac> dig +short c-amackie.co.uk mx
10 c-amackie-co-uk.p10.mxthunder.com.
20 c-amackie-co-uk.p20.mxthunder.net.
30 c-amackie-co-uk.p30.mxthunder.net.
40 c-amackie-co-uk.p40.mxthunder.net.
Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.
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Normally incoming messages are accepted, then forwarded.
The message you're receiving suggests mxthunder is accepting the mail correctly + has no entry in it's forwarding table for the donna.mcgovern user, so check your mxthunder setup first. Compare a working recipient to the failing one.