> Does anyone use this with Postfix? > > I'm trying to understand why I would want to reference a list of web > sites to block email?
I was curious to see what you were talking about, so I googled for "surbl blacklist": http://www.surbl.org/ Sounds like an interesting idea, but it's a post-delivery content filter approach, not something you can deploy as a first line of defense. In your quest for more RBLs, obviously there's spamhaus.org that you hadn't mentioned before. I also download these two blacklists periodically, process them, and host my own internal RBL server with rblsmtpd: http://www.openbsd.org/spamd/traplist.gz http://www.openbsd.org/spamd/nixspam.gz Like you, I also use spamcop. Not using SORBS right now, since I thought they were throwing in the towel at some point. When greylisting first became popular, I figured it would end up being ineffective after some short period of time. It's yet another tit-for-tat defense strategy that just requires about as much effort on the spammers' part as it does on ours. I never bothered implementing, even though early results showed it being very effective for my brother who has a similar mail setup. However, I have noticed a lot of delays for legitimate mail due to greylisting. On my systems, I've set up scripts to start temporarily blacklisting IPs that send me mail at nonexistent addresses (after some sanity checks). The idea being that spammers often flood many nonexistent addresses in conjunction with real ones they've harvested. My scripts don't stop a whole lot more spam, but it was an interesting experiment. Anyway, I'm still not happy with the level of spam that gets through my border, but I simply don't have time to keep up with it. Let me know if you come across any other good blacklists or tricks to cut down on the volume at the perimeter. tim _______________________________________________ PLUG mailing list [email protected] http://lists.pdxlinux.org/mailman/listinfo/plug
