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'libspf2' implements the Sender Policy Framework, which verifies that the Sender address of an email message matches (according to some policy) the client IP address that submitted it. This is unlike the present SMTP standard for email, which allows anyone to forge anyone else's email address. SPF libspf2 is a complete and robust implementation of SPF which provides support for many MTAs. It is designed to be secure, correct, portable, flexible, and fast (in that order).


Developer's API documentation available in HTML format from


Download version 1.2.4 (beta)
released on 22 February 2005


Related Projects


LicenseVerified byVerified onNotes
BSD 2ClauseJanet Casey14 July 2004
LGPLv2.1orlaterJanet Casey14 July 2004

Leaders and contributors

Michel Bouissou Contributor
Poskanzer Contributor
Wayne Schlitt Maintainer
Shevek Contributor
Dean Strik Contributor
Eric Dorland Contributor
Michael Brumm Contributor

Resources and communication

Audience Resource type URI
Bug Tracking E-mail
Developer E-mail
Support E-mail

Software prerequisites

This entry (in part or in whole) was last reviewed on 7 January 2008.


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The copyright and license notices on this page only apply to the text on this page. Any software or copyright-licenses or other similar notices described in this text has its own copyright notice and license, which can usually be found in the distribution or license text itself.

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