I remember reading an article on blocking emails with nonames with Exchange 5.5 on Nt 4.0 with SP6a. Does anyone remember how to do it? Was it blocking in the Internet connection of Exchange with a "." or something?
I'm not exactly sure what you are asking, but if you are trying to block the ones that show up in your outbound queue with no sender specified, those are actually Non-Delivery Responses generated by your server and probably trying to go to bogus spammer reply addresses. Those aren't spam relays with no sender specified. I don't do much with those except for occasionally go in to the queue, sort it by sender name, and delete all 200 or so bad NDR's.
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