I seem to be stuck between mail administrators pointing their fingers at each other for the issue of these probe failures.  I just do not know how I can get to the bottom of this issue and get it resolved.  I cannot determine if it is the mail server or the content filtering devices.  

The error is as follows:
	The reason for the problem:
	5.1.0 - Unknown address error 550-'REJECTED - Invalid characters in sender =
	email address [@]'

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