> plus any address @blah.com

This is an extremely ill-advised practice; spammers have tried using
@example.com addresses to send to example.com users for years. Hopefully
you're using whitelist_from_rcvd or checking authentication or similar
techniques.

Also, are you using network tests? Assuming your timestamps are accurate all
of these should have hit on one or more URIBL rules.
-- 
Dave Pooser
Cat-Herder-in-Chief, Pooserville.com
"...Life is not a journey to the grave with the intention of arriving
safely in one pretty and well-preserved piece, but to slide across the
finish line broadside, thoroughly used up, worn out, leaking oil, and
shouting GERONIMO!!!" -- Bill McKenna


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