Date: Wed, 1 Jun 2005 10:22:46 -0400 From: Bill Moran <wmoran@potentialtech.com> To: Bart Silverstrim <bsilver@chrononomicon.com> Cc: freebsd-questions@freebsd.org Subject: Re: postgrey question Message-ID: <20050601102246.3f199feb.wmoran@potentialtech.com> In-Reply-To: <0a6397740f09ea4ac7cce0b1bead3bde@chrononomicon.com> References: <0a6397740f09ea4ac7cce0b1bead3bde@chrononomicon.com>
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Bart Silverstrim <bsilver@chrononomicon.com> 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 am still googling for info, but as I understand it the policy will > inject the message to another queue for postgrey to evaluate? If this > is true, what happens if I install it while still running the > postfix/amavis solution, which is also a double-queue system for > evaluation of messages? Will doing a make install for postgrey damage > the installation we currently have in place and working? > > Anyone else running postgrey with amavis on postfix, on FreeBSD? I'd > appreciate any feedback/experiences people have to offer. Yes, I'm running Postgrey with Amavis on FreeBSD. Works great. The short answer is that Postgrey plays nice with Amavis. The medium-length answer is that Postgrey simply becomes another check that is run. Postfix has a "policy service" hook that allows Postfix to consult with an outside program prior to accepting mail. This is a different process than the multi-queue system that Amavis uses, and the two co-exist nicely. Postgrey works more like the rbl checks than the multi-queue system that Amavis uses. The long answer is contained in the technical details of Postfix, and the Postfix source code, and I won't attempt to duplicate that here ;) -- Bill Moran Potential Technologies http://www.potentialtech.com
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