I am routinely getting listed on backscatterer.org's blacklist. I've gone through their guide on how to prevent this (lousy guid, btw) and am at a standstill. DNSbl.info gave me the best description about it and it looks like my server does the proper notifications for bad emails. I really need to get this taken care of - has been going on for almost a year now and is a thorn in my side. Any advice on how to make sure you don't get listed on backscatterer.org (and barracuda for that matter)?