SMTP filter exclusions not working when return-path is empty

[Ken Whitcomb <ken@xxxxxxxxxxxxxx>]

Some users need to forward mail from a Groupwise system to their 
accounts on my system. Using the Groupwise rules to forward leaves 
the return-path field empty. I believe that this is why one of my 
filters (I'm using SA behind three RBLs, spamhaus.org, spamcop.net, 
and njabl) is matching these messages.

I've added the domains for the two different groupwise systems as 
exclusions in all of the filters (although I believe that SA is the 
one flagging these messages) but this has proven ineffective. The 
mail being forwarded by a Groupwise rule is still being matched.

Any suggestions?

ken Whitcomb

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