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Verifies that a sender's address matches the address that submitted it

'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 1.2.10 (beta)
released on 10 June 2013


Related Projects


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

Leaders and contributors

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

Resources and communication

AudienceResource typeURI

Software prerequisites

This entry (in part or in whole) was last reviewed on 25 February 2017.


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