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SPF is information published by the domain owner about what systems may legitimately send e-mail for the domain. Greylisting takes advantage of spam and viruses that do not follow the RFCs and retry deliveries on temporary failure. These checks can be used as part of a mail system and allow several orders of magnitude reduction in spam, lower system load, and few problems with legitimate mail getting blocked.
Tumgreyspf uses the file-system as its database, no additional database is required to use it, see /var/lib/tumgreyspf/data and it's clean-up cron script. Also take care that tumgreyspf will block emails from any domain with DNS configured with a buggy SPF record.
To use tumgreyspf, simply add this to your postfix configuration, and issue a /etc/init.d/postfix reload: /etc/postfix/main.cf: --------------------- smtpd_recipient_restrictions = [...] reject_invalid_hostname reject_non_fqdn_sender reject_non_fqdn_recipient reject_unknown_sender_domain reject_unknown_recipient_domain reject_unverified_recipient [...] permit smtpd_sender_restrictions = more»
tumgreyspf README $Id: README,v 1.12 2006-10-29 17:00:09 jafo Exp $ ================= This is tumgreyspf, an external policy checker for the postfix mail server. It can optionally greylist and/or use spfquery to check SPF records to determine if email should be accepted by your server. It uses the file-system as it's database, no additional database is required to use it. LICENSE tumgreysp more»
I have run tests of this code on two machines to determine the performance it is capable of. The first is my development laptop, a 1.2GHz Celeron (with cpufreq pushing it down to 800MHz), running on the JFS filesystem. The other is our mail server, a 2.66Ghz P4 running on the XFS filesystem running on a two-drive RAID-1 storage system. This RAID array was two 7200RPM Hitachi 80GB SATA drives usi more»
tumgreyspf(8) tumgreyspf(8) NAME tumgreyspf - an more»
tumgreyspf (1.35-7) unstable; urgency=low * As discussed with the release team, the file /etc/cro more»
================================ Version 1.35 -- Wed Jul 23, 2009 Fixed a bug caused when the SPF r more»
Documentation Something which generates stats and/or graphs of greylisting. Package it.
This package was debianized by Thomas Goirand <email@example.com> on Mon, 08 Oct 2007 04:00:55 +000 more»