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File: //usr/share/doc/postfix/examples/smtpd-policy/README.SPF

See http://www.openspf.org/Software for the current version of the
SPF policy daemon for Postfix.

SPF support is also available via MILTER plugins, such as sid-milter
at http://sourceforge.net/projects/sid-milter/ which implements both
SenderID and SPF.