From ArchWiki

dma (Dragonfly Mail Agent) is a tiny Mail Transport Agent (MTA). It is able to accept mails and deliver it to local or remote destinations; however, if you want to send and receive mails with your domain name, then you will need a full-featured mail server.


Install the dma package.


dma has two main configuration files: /etc/dma/dma.conf contains main setup directives and /etc/dma/auth.conf is necessary for authentication on SMTP servers. dma provides sane defaults so you may be able to use it without special configuration for local mail delivery.

SMTP transport

If you want to route mail through external SMTP server you must set SMARTHOST address (also known as relay host) in /etc/dma/dma.conf:

SMARTHOST smtp-host

Also do not forget to set authentication credentials in /etc/dma/auth.conf in the following format:


To have dma actually use the credentials file, set AUTHPATH:

AUTHPATH /etc/dma/auth.conf

To change default port set PORT directive (25 is default):

# accept mail from external MTAs (STARTTLS is also an option)

# accept mail from MUAs with TLS
PORT 465

# accept mail from MUAs (STARTTLS is also an option)
PORT 587


SECURETRANSFER directive enables encryption during mail transfers. Depending on your needs uncomment STARTTLS to enable STARTTLS support and activate OPPORTUNISTIC_TLS to permit unencrypted fallback in case of error.

For whatever reason you may want to perform plain text SMTP authentication. In such case uncomment SECURE directive and change it to INSECURE explicitly.


If you want to substitute original From: field in envelope you can use MASQUERADE feature:

# send mails as user foo (hostname will be derived with gethostbyname() or set to MAILNAME directive)

# send mails from host bar (username will be substituted)

# send mail as user foo from host bar


To send test mail execute the following from command line:

$ mail -s "Just a dma test"
This is just a small test message

Run journalctl -r as root to see if all went good. Also you can check dma queue with:

$ dma -bp

/var/spool/dma directory also holds undelivered/unprocessed mails.


Send mails through Google's SMTP servers


If you use 2-Step Verification (also known as two-factor authentication) procedure then you should create so-called App Password.

To do that login into your Google Account, choose Security entry on the left panel and click on App Passwords in Signing in to Google panel. If you do not see this item please consult corresponding thread on Google.

Click on Select app and choose desired application (usual called as Mail). Then click on Select device and choose the device, but it is better to add custom device and call it appropriately for easy future management. Then click on Generate and write down your App Password (16-character code in the yellow bar).

Warning: It is not possible to review or change app password later so use it immediately.


PORT 587
AUTHPATH /etc/dma/auth.conf

The MASQUERADE line ensures that mails sent by DMA appear to come from the specified user. Google will reject emails that do not come from the correct Google account.

Note: Do not forget to specify your Google account login and password (or App Password instead, see #Prerequisites).