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The Perl module Mail::SPF::Query
has been the very first implementation of SPF and is currently the de
facto reference implementation. It roughly conforms to the
latest specification, however due to its long
heritage (reaching back to 2003) there are some deviations.
The Mail::SPF::Query package includes a comprehensive test
suite, a command-line query tool, a query server, and sample plugins for
several mail servers. The library also supports a number of
non-standard features, such as best-guess processing
or trusted forwarder accreditation checking. Developers should
read the developer's guide for more
information.
The project is currently working on a new Perl module,
Mail::SPF, to replace Mail::SPF::Query as the reference
implementation (ETA April 2006).
Mail::SPF::Query has been packaged at least for
Debian
and
RedHat/Fedora.
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James Couzens and Sean Comeau have
implemented libspf. It comes with patches for Sendmail, Qmail, and Courier.
Wayne has written an alternative implementation
called libspf-alt. It is now part of libspf2.
Terence Way has implemented SPF in Python.
Roger Fullerton has released an SPFJava library.
Joshua Tauberer has written an extension for Mozilla Thunderbird.
Michael R Brumm has written an SMTP
SPF Filter which has been bought by GFI Software
but remains available as freeware;
congratulations!
Roger Moser has written an implementation for Windows.
Johan Strand has written an SPF event sink for Windows 2000.
The commercial antispam solution Aloaha has added SPF
support as a freeware component.
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The following features need to be added to MTAs to make them SPF-conformant:
- (required) SPF testing through DNS lookups.
- (optional, but strongly recommended) Addition of the Received-SPF header.
- (bonus) Sender Address Rewriting to accommodate forwarding and bounce reporting.
If you'd like to get involved, join the spf-devel mailing list! You should also look at the Developers Guide which describes best practices.
Shevek is working on building MTAs that have SPF
and SRS all built in. His status
page describes many MTAs.
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Postfix
Policy Daemon: Postfix-Policyd v1.07
for Postfix versions 2.1 and higher, by Meng Weng Wong.
An SMTP Proxy version will be released soon.
Sendmail
Milter: Milter-SPF 1.42 by Mark Kramer. (INSTALL instructions)
RPM for RedHat/Fedora
libspf comes with patches for sendmail.
Qmail
Plugin: At least two beta-grade patches are available:
the one that comes with libspf and one
by Christophe Saout.
libspf comes with patches for sendmail.
qpsmtpd has an SPF plugin.
Exim
ACL: v2.09 for Exim 4.x by David Saez
Separate HOWTO by Martin Tettke: http://www.xmn-berlin.de/~marte/exim/exim4_exiscan-acl.html
Courier
Perl Module: Courier::Filter::Module::SPF by Julian Mehnle
MS Exchange
See Windows above.
Other MTAs That Support SPF
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