DMARC Manpage
From: https://manpages.ubuntu.com/manpages/jammy/man8/opendmarc.8.html
From: https://manpages.ubuntu.com/manpages/jammy/man8/opendmarc-check.8.html 

NAME
	opendmarc - DMARC email policy filter for MTAs



SYNOPSIS
opendmarc   [-A]  [-c  configfile]  [-f]  [-l]  [-n]  [-p  socketspec]  [-P  pidfile]  [-t
file[,file[...]]]  [-u userid[:group]] [-v] [-V]



DESCRIPTION


opendmarc implements the proposed DMARC specification for authentication  of  message  and
reporting of observed traffic.

opendmarc uses  the  milter  interface, originally distributed as part of version 8.11 of
sendmail(8), to provide a DMARC processing service for mail transiting a milter-aware MTA.

Most, if not all, of the command line options  listed  below  can  also  be  set  using  a
configuration file.  See the -c option for details.

opendmarc
relies  on  addition  of  Authentication-Results  fields by upstream filters on
trusted hosts to collect input to the DMARC algorithm.  It does not itself do DKIM or  SPF
evaluation.



OPTIONS
	

-A Automatically  re-start  on  failures.   Use  with  caution;  if  the  filter fails
instantly after it starts, this can cause  a  tight  fork(2)  loop.   This  can  be
mitigated  using  some  values  in the configuration file to limit restarting.  See
opendmarc.conf(5).


-c configfile Read the named configuration file.  See the opendmarc.conf(5)
man page for details.  Values in the configuration file are overridden when 
their equivalents are provided on the command line until a configuration reload 
occurs.   The  OPERATION  section describes  how  reloads are triggered.  The 
default is to read a configuration file from /etc/opendmarc.conf if one exists,
or  otherwise  to  apply  defaults  to  all values.


-f Normally  opendmarc forks and exits immediately, leaving the service running in the
background.  This flag suppresses that behaviour so that it runs in the foreground.


-l Log via calls to syslog(3) any interesting activity.


-n Parse the configuration file and  command  line  arguments,  reporting  any  errors
found,  and  then  exit.   The  exit  value  will be 0 if the filter would start up
without complaint, or non-zero otherwise.


-p socketspec
Specifies  the  socket  that  should  be  established  by  the  filter  to  receive
connections  from sendmail(8) in order to provide service.  socketspec is in one of
two forms: local:path which creates a UNIX domain socket at the specified path,  or
inet:port[@host]  or  inet6:port[@host] which creates a TCP socket on the specified
port within the specified protocol family.  If the host is not given  as  either  a
hostname  or  an  IP  address,  the socket will be listening on all interfaces.  If
neither socket type is specified,  local  is  assumed,  meaning  the  parameter  is
interpreted  as  a path at which the socket should be created.  If an IP address is
used, it must be enclosed in square brackets.  This parameter is mandatory.


-P pidfile
Specifies a file into which the filter should write its process ID at startup.


-t file[,file[,...]]
Reads email messages from the named files  and  processes  them  as  if  they  were
received by the filter.  The service is not started, and actions normally sent back
to the MTA will instead be printed on standard output.


-u userid[:group]
Attempts to be come the specified userid before starting operations.   The  process
will  be assigned all of the groups and primary group ID of the named userid unless
an alternate group is  specified.   See  the  FILE  PERMISSIONS  section  for  more
information.


-v Increase  verbose  output  during  test mode (see -t above).  May be specified more
than once to request increasing amounts of output.


-V
Print the version number and supported canonicalization and  signature  algorithms,
and then exit without doing anything else.




SIGNALS

	Upon  receiving  SIGUSR1,  if the filter was started with a configuration file, it will be
re-read and the new values used.  Note that any command line overrides provided at startup
time  will  be lost when this is done.  Also, the following configuration file values (and
their corresponding command line items, if any) are not  reloaded  through  this  process:
AutoRestart  (-A),  AutoRestartCount,  AutoRestartRate,  Background,  MilterDebug, PidFile
(-P), Socket (-p), UMask, UserID (-u).   The  filter  does  not  automatically  check  the
configuration file for changes and reload.




VERSION

	 This man page covers version 1.4.2 of opendmarc.



COPYRIGHT

Copyright (c) 2012, The Trusted Domain Project.  All rights reserved.



SEE ALSO

	
opendmarc.conf(5), sendmail(8)

Sendmail Operations Guide

RFC4408 - Sender Policy Framework

RFC5321 - Simple Mail Transfer Protocol

RFC5322 - Internet Messages

RFC5451 - Message Header Field for Indicating Message Authentication Status

RFC6376 - DomainKeys Identified Mail

RFC6591 - Authentication Failure Reporting Using the Abuse Reporting Format


                                    The Trusted Domain Project                       opendmarc(8)

=======================================================




jammy (8) opendmarc-check.8.gz
Provided by: opendmarc_1.4.2-1_amd64 bug
From: https://manpages.ubuntu.com/manpages/jammy/en/man8/opendmarc-check.8.html



NAME
	opendmarc-check - DMARC record check tool



SYNOPSIS
	opendmarc-check domain [domain [...]]



DESCRIPTION
	opendmarc-check  queries  the  DNS  for  a  DMARC  record for the named domain(s) and then
translates the content found to a human-readable form.  This can be used  to  ensure  that
the DMARC policy you have placed in the nameserver is what you intended for others to see.



VERSION
	This man page covers version 1.4.2 of opendmarc. 



COPYRIGHT
	Copyright (c) 2012, The Trusted Domain Project.  All rights reserved. 



SEE ALSO
	opendmarc.conf(5), opendmarc(8)

The Trusted Domain Project                 opendmarc-check(8)