tumgreyspf

What people are saying about tumgreyspf:

David B Cook

tumgreyspf - such a simple solution to a big problem. I implemented this yesterday on our primary and backup MX servers. What a huge difference! We were already using a combination of sane Postfix rules and RBL's but stuff still got through. Today we have actually received support calls saying "What did you guys do? I haven't received a single SPAM since yesterday!" and there appears to be no false positives to go along with this.

Introduction

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.

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. We use these checks as part of our mail system and have seen several orders of magnitude reduction in spam, lower system load, and few problems with legitimate mail getting blocked.

It uses the file-system as it's database, no additional database is required to use it.

Download

FTP: ftp.tummy.com:/pub/tummy/tumgreyspf/

Recent changes

WHATSNEW (first 15 lines):

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Version 1.34 -- Wed Jun 10, 2009

Fixing a bug which caused many SPF return results to bypass greylisting.
      Identified by Tomasz 'urug' Olszewski

================================
Version 1.33 -- Sun Jul 20, 2008

Pretty print the time in tumgreyspf-stat, based on code by Luis Botero.
Fixing a code bug causing error "global name 'Except' is not defined"
      Reported by Joe Lowe.

================================
Version 1.32 -- Thu Nov 29, 2007
[...]

Requirements

Python: You can get source (and binaries for selected systems) from www.python.org.

SPF requires either the C or Perl binary or Python SPF library: tumgreyspf can either call the external SPF checking program from the SPF site, or the Python SPF library. The latter is preferred.

Description and License

tumgreyspf is licensed under the GPL.

Advantages

Does not require a database library, nor does it suffer from database corruption as some other greylist implementations have.
Requires few external dependencies.
Little regular maintenance is required.