I have re-enabled 'Refuse Null Senders' to relieve this problem, but would like to find a more compliant solution. Does any one know how to attack this issue in another way?
This is a very, very common problem -- if you look at the return addresses of your spam, you'll see that about 90% or so are either valid addresses or could be. Those people will all get bounce messages.
By using "Refuse NULL Senders" temporarily, you're saying "These bounces are so bad I'm willing not to receive ANY bounce messages temporarily". And, there's the side-effect that these double-bounces will often be seen by systems administrators, who end up doing your job for you (which is why they list people who do this in http://www.rfc-ignornant.org ).
Unfortunately, I'm not aware of any way to easily distinguish these bounces from other bounces.
-Scott
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