Dave Lugo wrote: > On Thu, 18 May 2006, Brent Clark wrote: > >> Silly question, cause you probally know / do it, but are you using >> sender / callback verification. >> >> > > Nope. > > >> I find that 90% of my spam blocking gets handled by this, and then after >> that im reliant on Dspam. >> >> > > I'm glad it helps you, but for the folks[1] with domains that > are heavily forged by spammers, the callbacks themselves are > a additional DoS they have to deal with. > > [1] not me, but others I know. >
Not if it's done right. Exim caches results avoiding repeated calls. And I do a trick with dictionary attacks where I will return a DEFER on an IP address for a 5 minute period if they commit certian sins that get their IP on my 5 minute defer lists. -- ## List details at http://www.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://www.exim.org/eximwiki/
