[opendmarc-users] pypolicyd-spf integration

[Andreas Schulze]

Murray S. Kucherawy:

> This sounds like a bug in the postfix implementation of milter
No, name it 'limitation'

> What's the difference between a milter and a policy daemon?
http://www.postfix.org/MILTER_README.html
http://www.postfix.org/SMTPD_POLICY_README.html

The policy delegation protocol was introduced in the very early days  
of postfix.
A "policy daemon" is therefore a postfix specific application which has the
ability to inspect some metadata around a smtp connection and return exactly
one action to postfix. Because of this limitations the milter protocol
was introduced in postfix later.

By design headers added by a policy server may not be visible to a milter.
To reliable use opendmarc, a milter based spf checker should be preferred.

Andreas