"501 5.5.4 Invalid Address" error message

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"501 5.5.4 Invalid Address" error message .
I have an ASP application that send emails to users on a network.
Most of the time it succeeds but on the odd occasion it get the error
above.
I know the email addresses are correct.


My questions are:
How can I trace this easily?
Is it an 'Exchange Sever' problem as the email addresses are correct?

.



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