Simple Postfix policy server for RFC 4408/7208 SPF checking

 postfix-policyd-spf-perl is a basic Postfix SMTP policy server for SPF
 checking. It is implemented in pure Perl and uses the Mail::SPF module. The
 SPF project web site is http://www.openspf.net/. postfix-policyd-spf-python
 is a more featureful alternative for use cases this package does not cover.