Well, remember the filters run in a specific order. Graylisting is one of the very last filters to run -- it only gets a chance to reject connections that have already passed every other filter. So it's very possible some of the connections rejected by the missing rDNS filter would also have been stopped by graylisting, which would make graylisting's effectiveness appear higher. Ditto for the other tests like DNS blackholes, earlytalkers, etc.
The only way to know for sure would be to disable every other filter and see what happens to the rejection rate. -- Sam Clippinger On Jul 12, 2012, at 12:15 PM, BC wrote: > > We are getting away from the original thought of this thread... > > I get 1 spam per day, maybe. So I have no interest in using an > outside blacklist checker. In my case it would merely be adding to > background internet traffic clutter unnecessarily. > > > Here is a line from my maillog: > > DENIED_RDNS_MISSING from: cd...@hotmail.com to: > wcfgynhh90...@yahoo.com.tw origin_ip: 27.41.147.251 origin_rdns: > (unknown) auth: (unknown) encryption: (none) reason: (empty) > > I have SCADS of lines like this (I have no idea who the to: or from: > folks are - I only host one domain on my box). In my mind, this > implies that the RDNS_MISSING function of spamdyke is keeping the > OVERWHELMING majority of the spam out of my box. > > Am I misinterpreting this? > > > > On 7/12/2012 11:00 AM, spamdyke-users-requ...@spamdyke.org wrote: >> I use: >> dns-blacklist-entry=zen.spamhaus.org >> dns-blacklist-entry=bl.spamcop.net >> >> It's very rare that these give a false positive. I would try them to see >> how they perform for you. > > > _______________________________________________ > spamdyke-users mailing list > spamdyke-users@spamdyke.org > http://www.spamdyke.org/mailman/listinfo/spamdyke-users _______________________________________________ spamdyke-users mailing list spamdyke-users@spamdyke.org http://www.spamdyke.org/mailman/listinfo/spamdyke-users
