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opendmarc(8) System Manager's Manual opendmarc(8) NAME opendmarc - DMARC email policy filter for MTAs SYNOPSIS opendmarc [-A] [-c configfile] [-f] [-l] [-n] [-p socketspec] [-P pid- file] [-t file[,file[...]]] [-u userid[:group]] [-v] [-V] DESCRIPTION opendmarc implements the proposed DMARC specification for authentica- tion 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 up- stream filters on trusted hosts to collect input to the DMARC algo- rithm. 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 /usr/local/etc/opendmarc.conf if one ex- ists, or otherwise to apply defaults to all values. -f Normally opendmarc forks and exits immediately, leaving the ser- vice running in the background. This flag suppresses that be- haviour 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, report- ing any errors found, and then exit. The exit value will be 0 if the filter would start up without complaint, or non-zero oth- erwise. -p socketspec Specifies the socket that should be established by the filter to receive connections from sendmail(8) in order to provide ser- vice. socketspec is in one of two forms: local:path which cre- ates 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 opera- tions. The process will be assigned all of the groups and pri- mary group ID of the named userid unless an alternate group is specified. See the FILE PERMISSIONS section for more informa- tion. -v Increase verbose output during test mode (see -t above). May be specified more than once to request increasing amounts of out- put. -V Print the version number and supported canonicalization and sig- nature 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 com- mand line overrides provided at startup time will be lost when this is done. Also, the following configuration file values (and their corre- sponding command line items, if any) are not reloaded through this process: AutoRestart (-A), AutoRestartCount, AutoRestartRate, Back- ground, 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)
NAME | SYNOPSIS | DESCRIPTION | OPTIONS | SIGNALS | VERSION | COPYRIGHT | SEE ALSO
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