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.TH pyspf-milter 8
.SH NAME
.B pyspf-milter
\- SPF checking filter for MTAs
.SH SYNOPSIS
.B pyspy-milter [configfile]

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

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

.SH OPTIONS
.TP
See
.I 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.

.SH NOTES
When using DNS timeouts be sure not to use a timeout that is larger than the
timeout being used for interaction between
.I 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.

.SH EXIT STATUS
Filter exit status codes are selected according to
.I sysexits(3).

.SH 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.

.SH VERSION
This man page covers version 3.0.0 of
.I pyspf-milter.
.SH 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>
.SH SEE ALSO
.I policyd-spf.conf(5), sendmail(8)
.P
Sendmail Operations Guide
.P
RFC5321 - Simple Mail Transfer Protocol
.P
RFC5322 - Internet Messages
.P
RFC7208 - Sender Policy Framework (SPF) for Authorizing Use of Domains in Email, Version 1
.P
RFC7601 - Message Header Field for Indicating Message Authentication Status