On 23 Jan 2007, at 18:05, Hal Dell wrote: > Hello all... I attempted a migration to v1.24 and also tighten down xMail > SMTP server to reject more SPAM. > > I have set CheckMailerDomain=1 and SMTP-RDNSCheck=1. I would first like > somone point me to a web page or other documenation that can provide me a > little detail about these checks and how the 220 message plays a role in > these checks.
That worked perfectly when I tried it as it coincided with a friends organisation change of ISP during which period their DNS was screwed (maybe for a month or more). I had a phone call asking me why I was bouncing his emails so set the options to: # "CheckMailerDomain" "1" "SMTP-RDNSCheck" "-2" ie. disabled CheckMailerDomain and apply 2 sec delay to responses where RDNS check failed. I was led to believe lots of spam and virus distribution was by dumb scripts that don't wait for a server response so the delay causes the session to fail. At least at the time this seemed to make a large impact in reduction of unwanted email. I found a delay of 15 sec was too much for some impatient mailers whilst 2 sec seemed enough. Through last year the levels of spam via genuine mailers increased to point where spamassassin was catching >> 100 per day and > 20 per day going to users so a bit late I tried 'glist' which made another large difference so spamassassin still occasionally catches one and users get just a few per day. I believe spamassassin needs sufficient bad emails to keep it going. So far as I know there are no false positives. David - To unsubscribe from this list: send the line "unsubscribe xmail" in the body of a message to [EMAIL PROTECTED] For general help: send the line "help" in the body of a message to [EMAIL PROTECTED]
