NAME

       pyspf-milter - SPF checking filter for MTAs

SYNOPSIS

       pyspy-milter [configfile]

DESCRIPTION

       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.

OPTIONS

       See    policyd-spf.conf (5) for information about available options. With the exception of specifying the
              configuration file to use, pyspf-milter does not support command line option switches.

NOTES

       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.

EXIT STATUS

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

HISTORY

       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.

VERSION

       This man page covers version 3.0.0 of pyspf-milter.

COPYRIGHT

       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>

SEE ALSO

       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)