If you're using a development version of Postfix higher than
2.0.14-20030804, you can plug in an SPF filter:
http://spf.pobox.com/postfix-policyd-1.0.txt
Instructions for operating a policy daemon are inside the file, modulo a
few filename changes.
If you're using sendmail with Milter capability,
http://spf.pobox.com/sendmail-milter-spf-1.1.pl
If you're using Exim 4,
http://spf.pobox.com/exim4.spf.acl.txt
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Sender Permitted From: http://spf.pobox.com/
Archives at http://archives.listbox.com/spf-discuss/current/
Latest draft at http://spf.pobox.com/draft-mengwong-spf-02.9.3.txt
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