[msexchange] Bogus email address

Exchange 5.5 sp4/ WINNT4 sp6/Dell PowerEdge Server

I have a message that is being repeated to my email domain.

My company is @xyz.com.
Someone is sending an email to adsfa@xxxxxxx (bogus address). 350 emails
overnight and stillgoing strong.
There are no internet headers, and my logs do not show who the originator of
the message is.
I don't know what to do about blocking these emails.

Could someone please give me a hint in the right direction.
Thanks,

Mike








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