> Except these also have a good chance of blocking legitamate mail. I've > had several bad experiences with blocklists of this type who blocked my > mail simply because I was at the same ISP as a spammer. This guerilla > warfare stuff creates too many innocent casualties. > > It's possible that the services that you mentioned don't employ bad > listing tactics, but you'd still be relying on somebody else's judgement > on who to block. I would rather keep my own blocklist, which I can trust.
Well, anti-spam is my day-job, and I wouldn't recomend those if I didn't think they were worth it. From about ordb down on that list you get less and less hits (and possibly a few false positives - but at least the sender gets notified of the problem) and I would choose carefully based on what kind of email traffic you handle, but I would certainly recommend anyone running *any* mail server, no matter how sensitive, at the very least employ CBL, SBL and OPM (which is encompassed by SpamHaus's SBL+XBL list so you only have to do one lookup). There's a lot of fear about DNSBLs because of the early problems with the MAPS lists, and the current problems with SPEWS and SpamCopBL, but you'll note that none of those were listed above. Matt.
