Sender Policy Framework

SPF Libraries

Reference Implementation: Mail::SPF::Query

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 final SPFv1 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 and trusted forwarder accreditation checking.

The project is currently working on a new Perl module, Mail::SPF, to replace Mail::SPF::Query as the reference implementation (ETA June 2006).

Production-Grade Libraries

SPF Extensions for Mail Clients

SPF Extensions and Patches for Mail Servers

To be completed; for additional information see the old website.