Date: Fri, 05 Mar 2010 16:44:17 +0000 From: Matthew Seaman <m.seaman@infracaninophile.co.uk> To: John <john@starfire.mn.org> Cc: mikel king <mikel.king@olivent.com>, Programmer In Training <pit@joseph-a-nagy-jr.us>, freebsd-questions@freebsd.org Subject: Re: pf overload for SMTP Message-ID: <4B9134E1.7060501@infracaninophile.co.uk> In-Reply-To: <20100305163507.GA18338@elwood.starfire.mn.org> References: <20100305125446.GA14774@elwood.starfire.mn.org> <4B910139.1080908@joseph-a-nagy-jr.us> <20100305132604.GC14774@elwood.starfire.mn.org> <F4960422-5F59-4FF4-A2E4-1F0A4772B78B@olivent.com> <20100305154439.GA17456@elwood.starfire.mn.org> <4B912ADC.1040802@infracaninophile.co.uk> <20100305163507.GA18338@elwood.starfire.mn.org>
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 05/03/2010 16:35:07, John wrote: > Is there any reason one couldn't do something similar for SMTP? Maybe > a little wider sample window, like 10/300? Or would you end up blocking > too any things that you don't mean to block? Anyone played with this > for SMTP? You can do this with SMTP, but I'm not sure quite how useful it would be given the different usage patterns for e-mail. (I've applied it quite happly for FTP servers, for example) If you want to do some pf-level antispam stuff, then look at spamd -- in the ports as obspamd to prevent confusion with SpamAssassin's spamd. http://www.openbsd.org/cgi-bin/man.cgi?query=spamd&apropos=0&sektion=0&manpath=OpenBSD+Current&arch=i386&format=html This implements greylisting, greytrapping and teergrube against addresses blacklisted as spam sources. Last I checked it only worked on IPv4 though. It's a fairly light-weight means of eliminating quite a lot of spam, but it should be used in conjunction with other MTA mediated anti-spam techniques, for example SpamAssassin Cheers, Matthew - -- Dr Matthew J Seaman MA, D.Phil. 7 Priory Courtyard Flat 3 PGP: http://www.infracaninophile.co.uk/pgpkey Ramsgate Kent, CT11 9PW -----BEGIN PGP SIGNATURE----- Version: GnuPG/MacGPG2 v2.0.14 (Darwin) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAkuRNOEACgkQ8Mjk52CukIzcGACePJLeg/yorVq8vpVA6Nr7WBbI FksAn0hkNVrOo/m9o5gClh7J7zGoWdvU =JW5l -----END PGP SIGNATURE-----
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