On Fri, 2005-02-04 at 09:39, David Hoffman wrote: > > Paul emphasizes part of the point I was hoping to make originally. > Prior to using TMDA, I had LOADS of spam in several accounts. I did > whatever i could to make those accounts as hidden as possible. I never > used them in newsgroups or to register at web sites, but soon enough > the spam came pouring in. Even with RBLs, I was still getting way too > much spam. So I tried TMDA and it has worked great for me. If someone > wants to get in touch with me, they almost certainly understand that > clicking a link or sending a reply to a confirmation is a good thing > and the only ever have to do it one time. The people who get upset > about TMDA are the spammers. > > That being said.... my intention, if I can find a viable solution, was > to try using greylisting, followed by RBLs, and then possibly backed > up with SpamAssassin or ClamAV. Basically take TMDA out of the picture > altogether. > > The reason I was asking for information was not to start a C/R flame > war. It was because some articles on greylisting talk about how > non-compliant MTAs can break the greylisting system by NOT sending > back legitimate messages after the delay, or by seeing the delay > response as an error and reporting it back to the original sender. > > All I wanted to know is if anyone has seen issues like that and how to > get around them. I have not seen any of the potential problems people think they will have with greylisting. It actually worked far beyond what I had thought it would. Greylisting backed up with spamassassin is virtually 100% solution for spam with the added benefit that it reduced by several factors the CPU overhead I had when just using spamassassin. BTW: spamassassin by itself with a properly trained bayes database can get you in the 95 to 98 percent range for blocking all spam. But on a site that gets many thousands of spam messages a day it can become resource intensive. Greylisting is well worth the small amount of time to setup and test. Then you can judge the results yourself. I would be interested in hearing how it does for you. -- Scot L. Harris webid@xxxxxxxxxx Test-tube babies shouldn't throw stones.
