SPF Policy Server for Postfix (Python implementation)
pypolicyd-spf is a Postfix policy engine for Sender Policy Framework (SPF) checking. It is implemented in pure Python and uses the python-spf (pyspf) module. Updated for RFC 7208.
This SPF policy server implementation provides flexible options for different receiver policies and sender whitelisting to enable it to support a very wide range of requirements. As of version 1.3 changes in the standards track update to SPF, RFC 7208 are all incorporated.