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DMA(8)			FreeBSD	System Manager's Manual			DMA(8)

     dma -- DragonFly Mail Agent

     dma [-DiOt] [-Amode] [-bmode] [-f sender] [-L tag]	[-ooption] [-r sender]
	 [-q[arg]] [recipient ...]

     dma is a small Mail Transport Agent (MTA),	designed for home and office
     use.  It accepts mails from locally installed Mail	User Agents (MUA) and
     delivers the mails	either locally or to a remote destination.  Remote de-
     livery includes several features like TLS/SSL support and SMTP authenti-

     dma is not	intended as a replacement for real, big	MTAs like sendmail(8)
     or	postfix(1).  Consequently, dma does not	listen on port 25 for incoming

     The options are as	follows:

     -Amode  -Ac acts as a compatibility option	for sendmail.


	     -bp     List all mails currently stored in	the mail queue.

	     -bq     Queue the mail, but do not	attempt	to deliver it.	See
		     also the `DEFER' config file setting below.

	     All other modes are ignored.

     -D	     Do	not run	in the background.  Useful for debugging.

     -f	sender
	     Set sender	address	(envelope-from)	to sender.  This overrides the
	     value of the EMAIL	environment variable, but is overridden	by the
	     `MASQUERADE' config file setting.

     -i	     Ignore dots alone on lines	by themselves in incoming messages.
	     This should be set	if you are reading data	from a file.

     -L	tag  Set the identifier	used in	syslog messages	to the supplied	tag.
	     This is a compatibility option for	sendmail.

     -O	     This is a compatibility option for	sendmail.

	     Specifying	-oi is synonymous to -i.  All other options are	ig-

	     Process saved messages in the queue.  The argument	is optional
	     and ignored.

     -r	sender
	     Same as -f.

     -t	     Obtain recipient addresses	from the message header.  dma will
	     parse the To:, Cc:, and Bcc: headers.  The	Bcc: header will be
	     removed independent of whether -t is specified or not.

     dma can be	configured with	two config files:

     o	 auth.conf
     o	 dma.conf

     These two files are stored	per default in /etc/dma.

     Every file	contains parameters of the form	`name value'.  Lines contain-
     ing boolean values	are set	to `NO'	if the line is commented and to	`YES'
     if	the line is uncommented.  Empty	lines or lines beginning with a	`#'
     are ignored.  Parameter names and their values are	case sensitive.

     SMTP authentication can be	configured in auth.conf.  Each line has	the
     format "user|smarthost:password".

     Most of the behaviour of dma can be configured in dma.conf.

     SMARTHOST (string,	default=empty)
	   If you want to send outgoing	mails via a smarthost, set this	vari-
	   able	to your	smarthosts address.

     PORT (numeric, default=25)
	   Use this port to deliver remote emails.  Only useful	together with
	   the `SMARTHOST' option, because dma will deliver all	mails to this
	   port, regardless of whether a smarthost is set or not.

     ALIASES (string, default=/etc/aliases)
	   Path	to the local aliases file.  Just stick with the	default.  The
	   aliases file	is of the format
		 nam: dest1 dest2 ...
	   In this case, mails to nam will instead be delivered	to dest1 and
	   dest2, which	in turn	could be entries in /etc/aliases.  The special
	   name	`*' can	be used	to create a catch-all alias, which gets	used
	   if no other matching	alias is found.	 Use the catch-all alias only
	   if you do not want any local	mail to	be delivered.

     SPOOLDIR (string, default=/var/spool/dma)
	   Path	to dma's spool directory.  Just	stick with the default.

     AUTHPATH (string, default=not set)
	   Path	to the `auth.conf' file.

     SECURETRANSFER (boolean, default=commented)
	   Uncomment if	you want TLS/SSL secured transfer.

     STARTTLS (boolean,	default=commented)
	   Uncomment if	you want to use	STARTTLS.  Only	useful together	with

     FINGERPRINT (string, default=empty)
	   Pin the server certificate by specifying its	SHA256 fingerprint.
	   Only	makes sense if you use a smarthost.

     OPPORTUNISTIC_TLS (boolean, default=commented)
	   Uncomment if	you want to allow the STARTTLS negotiation to fail.
	   Most	useful when dma	is used	without	a smarthost, delivering	remote
	   messages directly to	the outside mail exchangers; in	opportunistic
	   TLS mode, the connection will be encrypted if the remote server
	   supports STARTTLS, but an unencrypted delivery will still be	made
	   if the negotiation fails.  Only useful together with

     CERTFILE (string, default=empty)
	   Path	to your	SSL certificate	file.

     SECURE (boolean, default=commented)
	   Uncomment this entry	and change it to `INSECURE' to use plain text
	   SMTP	login over an insecure connection.  You	have to	rename this
	   variable manually to	prevent	that you send your password acciden-
	   tally over an insecure connection.

     DEFER (boolean, default=commented)
	   Uncomment if	you want that dma defers your mail.  You have to flush
	   your	mail queue manually with the -q	option.	 This option is	handy
	   if you are behind a dialup line.

     FULLBOUNCE	(boolean, default=commented)
	   Uncomment if	you want the bounce message to include the complete
	   original message, not just the headers.

     MAILNAME (string, default=empty)
	   The internet	hostname dma uses to identify the host.	 If not	set or
	   empty, the result of	gethostname(3) is used.	 If `MAILNAME' is an
	   absolute path to a file, the	first line of this file	will be	used
	   as the hostname.

     MASQUERADE	(string, default=empty)
	   Masquerade the envelope-from	addresses with this address/hostname.
	   Use this setting if mails are not accepted by destination mail
	   servers because your	sender domain is invalid.  This	setting	over-
	   rides the -f	flag and the EMAIL environment variable.

	   If `MASQUERADE' does	not contain a @	sign, the string is inter-
	   preted as a host name.  For example,	setting	`MASQUERADE' to
	   `john@' on host `hamlet' will send all mails	as `john@hamlet'; set-
	   ting	it to `percolator' will	send all mails as

     NULLCLIENT	(boolean, default=commented)
	   Bypass aliases and local delivery, and instead forward all mails to
	   the defined `SMARTHOST'.  `NULLCLIENT' requires `SMARTHOST' to be

   Environment variables
     The behavior of dma can be	influenced by some environment variables.

	   Used	to set the sender address (envelope-from).  Use	a plain	ad-
	   dress, in the form of  This value will be over-
	   ridden when the `MASQUERADE'	config file setting or the -f flag is

     mailaddr(7), mailwrapper(8), sendmail(8)

     J.	B. Postel, Simple Mail Transfer	Protocol, RFC 821.

     J.	Myers, SMTP Service Extension for Authentication, RFC 2554.

     P.	Hoffman, SMTP Service Extension	for Secure SMTP	over TLS, RFC 2487.

     The dma utility first appeared in DragonFly 1.11.

     dma was written by	Matthias Schmidt <> and Simon
     Schubert <>.

FreeBSD	13.0			 May 20, 2017			  FreeBSD 13.0


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