pyspf-milter - SPF checking filter for MTAs

       Copyright (c) 2005-2008, Sendmail, Inc. and its suppliers.  All rights reserved.

       Copyright (c) 2009-2013, 2015, The Trusted Domain Project.  All rights reserved.

       Copyright (c) 2018, 2019, 2022 Scott Kitterman <scott@kitterman.com>

pyspf-milter implements the SPF standard for checking e-mail messages on a (mostly) per-domain basis.

       pyspf-milter uses the milter interface, originally distributed as part of version 8.11 of sendmail(8), to
       provide SPF checking services for mail transiting a milter-aware MTA.

       Filter exit status codes are selected according to sysexits(3).

       SPF  is  an  amalgam of several earlier proposals.  It was originally specified in RFC 4408.  The current
       specification is RFC 7208.  The SPF related processing was developed for  use  with  the  Postfix  unique
       policy  service  in  the  pypolicyd-spf  project.   When  the milter interface was added, the project was
       renamed SPF Engine.

pyspf-milter - SPF checking filter for MTAs

       When  using  DNS  timeouts  be  sure  not to use a timeout that is larger than the timeout being used for
       interaction between sendmail and the filter.  Otherwise, the MTA could abort a message while waiting  for
       a reply from the filter, which in turn is still waiting for a DNS reply.

       See    policyd-spf.conf(5)forinformationaboutavailableoptions.Withthe exception of specifying the
              configuration file to use, pyspf-milter does not support command line option switches.

policyd-spf.conf(5),sendmail(8)

       Sendmail Operations Guide

       RFC5321 - Simple Mail Transfer Protocol

       RFC5322 - Internet Messages

       RFC7208 - Sender Policy Framework (SPF) for Authorizing Use of Domains in Email, Version 1

       RFC7601 - Message Header Field for Indicating Message Authentication Status

                                                                                                 pyspf-milter(8)

pyspy-milter[configfile]

       3.1.0