NAME

     dma — DragonFly Mail Agent

SYNOPSIS

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

DESCRIPTION

     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 delivery includes several features like TLS/SSL support and
     SMTP authentication.

     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 connections.

     The options are as follows:

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

     -bmode

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

             -bq     Queue the mail, but don't attempt to deliver it.  See also the ‘DEFER’
                     config file setting below.

             All other modes are are ignored.

     -D      Don't run in the background.  Useful for debugging.

     -f sender
             Set sender address (envelope-from) to sender.  This overrides the value of the
             environment variable EMAIL.

     -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.

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

     -q[arg]
             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.

CONFIGURATION

     dma can be configured with two config files:

     •   auth.conf
     •   dma.conf

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

FILE FORMAT

     Every file contains parameters of the form ‘name value’.  Lines containing 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.

PARAMETERS

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

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

     SMARTHOST (string, default=mail.example.com)
           If you want to send outgoing mails via a smarthost, set this variable 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 don't 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.

     SECURETRANS (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 ‘SECURETRANS’.

     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 ‘SECURETRANS’ and ‘STARTTLS’.

     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 accidentally 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 is overridden by the -f flag and the EMAIL environment
           variable.

           If ‘MASQUERADE’ does not contain a @ sign, the string is interpreted as a host name.
           For example, setting ‘MASQUERADE’ to ‘john@’ on host ‘hamlet’ will send all mails as
           ‘john@hamlet’; setting it to ‘percolator’ will send all mails as
           ‘username@percolator’.

     NULLCLIENT
           Bypass aliases and local delivery, and instead forward all mails to the defined
           ‘SMARTHOST’.  ‘NULLCLIENT’ requires ‘SMARTHOST’ to be set.

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

     EMAIL
           Used to set the sender address (envelope-from).  Use a plain address, in the form of
           user@example.com.  This value will be overridden when the -f flag is used.

SEE ALSO

     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.

HISTORY

     The dma utility first appeared in DragonFly 1.11.

AUTHORS

     dma was written by Matthias Schmidt <matthias@dragonflybsd.org> and Simon Schubert
     <2@0x2c.org>.