A Exim 4 satellite installation.
This is based upon tianon/exim4 docker container - primarily to provide a simple way to configure a Gmail based installation. It performs configuration at startup and uses supervisor to run exim4 and should shutdown correctly.
To run use the environment variables to configure the Gmail account:
docker run -d --name exim4 -e GMAIL_USER=youruser@yourdomain.com -e GMAIL_PASSWORD=yourpasswordhere gameldar/exim4
By default all the inet interfaces are queried for their networking information to determine the relay networks, however this can be overwritten by specifying the RELAY_NETS environment variable when starting:
docker run -d --name exim4 -e GMAIL_USER=youruser@yourdomain.com -e GMAIL_PASSWORD=yourpasswordhere -e RELAY_NETS=192.168.1.1/24 gameldar/exim4
This can then be linked to another contain to be used as the SMTP host, e.g. for use with gameldar/bugzilla container you'd use:
docker run -d --name bugzilla --link exim4:mail -p 8080:80 gameldar/bugzilla
Then the exim4 relay via Gmail could then be used by setting the mail configure to use SMTP with a smtp host of 'mail'