Date: Wed, 1 Jun 2005 18:01:28 -0400 (EDT) From: "Bill Moran" <wmoran@potentialtech.com> To: "Chad Leigh -- Shire.Net LLC" <chad@shire.net> Cc: FreeBSD Mailing List <freebsd-questions@freebsd.org>, Bart Silverstrim <bsilver@chrononomicon.com> Subject: Re: postgrey question Message-ID: <54466.162.51.224.11.1117663288.squirrel@www.potentialtech.com> In-Reply-To: <8B6C5637-F4B3-4635-94EA-F1B8EE9D8A2F@shire.net> References: <0a6397740f09ea4ac7cce0b1bead3bde@chrononomicon.com> <8B6C5637-F4B3-4635-94EA-F1B8EE9D8A2F@shire.net>
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Chad Leigh -- Shire.Net LLC said: > > On Jun 1, 2005, at 8:07 AM, Bart Silverstrim wrote: > >> I've been looking into ways of improving our spam filtering. >> Currently I'm running postfix with amavisd-new (spamassassin and >> clamav), and saw an article on greylisting using postgrey. Turns >> out there's a port for it already in FreeBSD. > > I don't run postifx and the thing I am about to mention I have not > tried yet, but you may want to explore modifying your greylisting to > be based on spamassassin results. > > I use exim as the mta and there is a thing called sa-exim that lets > you run spamassassin at SMTP time so that you can reject mail if you > want before you actually are finished receiving it. The author of sa- > exim has modified it to do greylisting based on spamassassing scores > generated at smtp time, so that you only greylist mail that is > thought to be spam and do not inconvenience your regular users. > > Can you do spamassassin at smtp time with postfix? Yes you can. I recommend this. The postfix docs explain how to do it: http://www.postfix.org/SMTPD_PROXY_README.html I've used this technique and find it very helpful, as it makes bounce messages (caused by spam and viruses) nonexistent. -- Bill Moran Potential Technologies http://www.potentialtech.com
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