On 1/31/2012 12:40 PM, Phil Daws wrote: > Just to follow up we have seen a huge decrease in the amount of SPAM received > since we implemented the Invaluement RBLs.
Phil, Thanks for the feedback. It seems you greatly benefited from NOT listening to that one guy who said that adding another RBL is a waste of time... ya know... the same guy who suggested that I needed to read up on RBLs so that i could learn more about them... :) Perhaps I think a little too highly of myself?... but I admit, I was amused by that! PS - you mentioned that you were going to try greylisting next. Be careful because greylisting (1) can cause annoying delays and (2) some e-commerce systems, newsletters, and alert systems are not setup to do a retry--so order info can get lost due to greylisting I don't recall how SpamAssassin handles this.. but here is what I do to deal with those weaknesses: (1) in my scoring system, everything at 5+ is blocked as spam... AND I greylist ONLY those messages that score at 4.x (2) I massively whitelist many large ISP's MTA ranges from greylisting, partly because they are going to do a retry anyways and the ratio of spam blocked to legit mail delayed isn't so good with those senders. Between these two things, I get probably 90% of the benefits of greylisting, with only 10% of the problems from greylisting. Hope this helps! -- Rob McEwen http://dnsbl.invaluement.com/ r...@invaluement.com +1 (478) 475-9032
