Docker container that uses fastmail / authentication_milter for SPF, SenderID, DKIM and DMARC authentication. It can save result data to an SQLite database and send daily RFC compliant aggregate reports using its own SMTP integration or through a smarthost.
If a database cannot be found, it is automatically created (data/dmarc_reports.sqlite).
git clone https://github.com/freddieleeman/authmilter_docker.git
cd authmilter_docker
docker build -t freddieleeman/authmilter_docker .The data/ folder contains the configuration files for both Mail::DMARC and Mail::Milter::Authentication. This folder is attached as a shared volume to the docker container. This folder is also used for storing the SQLite database and log file. It can also be used to share a private key for DKIM signing the aggregate report emails (see mail-dmarc.ini).
data/mail-dmarc.ini = Mail::DMARC configuration file
data/authentication_milter.json = Mail::Milter::Authentication configuration file
Set 'logtoerr' to 1 in the authentication_milter.json configuration file. The log file authentication_milter.err is saved to the shared volume (docker: /config, host: ./data)
Replace /path/to/data in the command below with the location of the data folder containing the configuration files.
docker run -d \
-v /path/to/data:/config:rw \
-p 127.0.0.1:12345:12345 \
--name authmilter_docker \
--restart unless-stopped \
freddieleeman/authmilter_docker
add inet:localhost:12345 to smtpd_milters = in the Postfix main.cf configuration file
To enable daily (at 4am) sending of aggregate reports add a crontab to the host with the following command:
0 4 * * * docker exec authmilter_docker sh -c "dmarc_send_reports"
Use "dmarc_send_reports --verbose" for more verbose output.
docker exec authmilter_docker sh -c "dmarc_view_reports"