Date: Wed, 1 Jun 2005 16:03:35 -0600 From: "Chad Leigh -- Shire.Net LLC" <chad@shire.net> To: Bill Moran <wmoran@potentialtech.com> Cc: FreeBSD Mailing List <freebsd-questions@freebsd.org>, Bart Silverstrim <bsilver@chrononomicon.com> Subject: Re: postgrey question Message-ID: <AA825F9A-EDED-41FE-BCAB-D0B776042A14@shire.net> In-Reply-To: <54466.162.51.224.11.1117663288.squirrel@www.potentialtech.com> References: <0a6397740f09ea4ac7cce0b1bead3bde@chrononomicon.com> <8B6C5637-F4B3-4635-94EA-F1B8EE9D8A2F@shire.net> <54466.162.51.224.11.1117663288.squirrel@www.potentialtech.com>
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On Jun 1, 2005, at 4:01 PM, Bill Moran wrote: > 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. So, can you conditionally call the post_grey stuff based on this smtp- time spamassassin results? That would allow you to do what I described above, which allows you to minimize the downside of greylisting. Thanks bill! Chad
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