Check the forums and wiki for 'mynetworks' and see if that fixes the problem, there are plenty of posts covering this problem. It might help if you posted any errors in the logs.
You should also have a correct DNS A & MX record pointing to your server in addition to a correct /etc/hosts file, are they all correct?
In future, please only post once for a problem as it makes it difficult to answer your question if you post duplicates.
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Regards
Bill
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