From Free Software Directory
Jump to: navigation, search


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


version 1.2.10 (beta)
released on 10 June 2013


Related Projects



Verified by

Verified on


Verified by

Janet Casey

Verified on

14 July 2004

Verified by

Janet Casey

Verified on

14 July 2004

Leaders and contributors

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

Resources and communication

AudienceResource typeURI
Debian (Ref)

Software prerequisites

This entry (in part or in whole) was last reviewed on 21 February 2018.

Version comment

1.2.10 beta released 2013-06-10


Property "Submitted by" (as page type) with input value "{{{Submitted by}}}" contains invalid characters or is incomplete and therefore can cause unexpected results during a query or annotation process.

"Debian (Ref)" is not in the list (General, Help, Bug Tracking, Support, Developer) of allowed values for the "Resource audience" property.

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the page “GNU Free Documentation License”.

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.