Date: Thu, 29 Jun 2006 13:20:40 -0400 From: "Michael W. Oliver" <michael@gargantuan.com> To: isp@freebsd.org Subject: email filtering with GPG Message-ID: <20060629172040.GC78932@gargantuan.com>
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--xo44VMWPx7vlQ2+2 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Hi list, I have a question about a particular MTA, not FreeBSD specifically, but since you are a bunch of service provider folk I figured I would ask. Here is my situation. I am using Postfix as my MTA, and would like to drastically cut the amount of email that my users see. I am already doing blacklist filtering and lots of other stuff in "smtpd_recipient_restrictions" in main.cf, but it isn't enough. What I would like to do is kill any email that doesn't have a valid PGP/GPG signature, but I am not sure that Postfix is the right place to do this. Right now, all mail is delivered to ~/Maildir for each user by maildrop, and they pick up their mail via IMAPS (Dovecot). At first I was thinking about some sort of filter for Postfix that would check for a signature and then reject the message if the signature check failed. However, the more I think about it, the more I am inclined to use maildrop's xfilter mechanism to do the signature checking to keep the load off of Postfix. The reality is that I am not sure which is why I am asking you. Am I crazy? Can you think of better ways to do strict signature checking in this environment, either with Postfix, maildrop, or something else I am not currently using? I thank you for your time and consideration. --=20 Mike Oliver, KI4OFU [see complete headers for contact information] --xo44VMWPx7vlQ2+2 Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.4 (FreeBSD) iD8DBQFEpAvosWv7q8X6o8kRAkK6AJsFut/m7IxBcnHJU2p+tR04ZBP4sQCeM2WI y+95GZIxTcPO53C4fhZLA5w= =HuFY -----END PGP SIGNATURE----- --xo44VMWPx7vlQ2+2--
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