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Legacy Forums => Experienced User Forum => Topic started by: Cyrus on June 10, 2005, 03:11:24 AM

Title: Cutting down SPAM via qmail delay?
Post by: Cyrus on June 10, 2005, 03:11:24 AM

When spammers connect to a mailserver, they often just issue the commands bang bang bang, and don't wait for a response. I've read that raising the in_flow_delay to 5 seconds or so can cause spamming clients like this to fail, as they send their commands out of sync.

Anyone have any experience with implementing this method in a corporate environment? I really want to avoid false positives.

FYI I am getting 5000 or so spam connections that aren't blacklisted, about 200-300 messages get through the spam filters...

Title: Cutting down SPAM via qmail delay?
Post by: Cyrus on June 10, 2005, 07:18:46 AM

Sort of found a way with sendmail, anyone know if there are similar settings for qmail?

http://www.acme.com/mail_filtering/sendmail_config_frameset.html

Title: Re: Cutting down SPAM via qmail delay?
Post by: raem on June 10, 2005, 01:14:33 PM

Cyrus

Is greylisting suitable for your requirements ?
It does work very effectively but there are a few aspects to be aware of that may not suit your situation.
http://lists.contribs.org/mailman/public/devinfo/msg07912.html