https://wiki.ubuntu.com/UbuntuWeeklyNewsletter/Issue30
It's down in the "Changes In Feisty" section (Feisty Fawn is the code name for
the next Ubuntu release):
Feisty includes a number of changes to provide SPF (Sender Policy Framework)
checking with Postfix. SPF is the most deployed e-mail domain forgery
protection technology today and was codified by the IETF in RFC 4408. See
http://www.openspf.org/ for more information. Feisty will be the first Linux
distribution to include everything needed to do RFC 4408 compliant SPF
checking. The Python SPF library has been updated to the latest release
(python-spf 2.0.3). A companion Postfix policy server (python-policyd-spf)
is also included for a pure Python approach. There is also a new Perl SPF
library (libmail-spf-perl) with a companion Postfix policy server
(postfix-policyd-spf-perl).
Scott K
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Sender Policy Framework: http://www.openspf.org/
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