How to configure host system to use dms for delivery?

[jakkarth]

I've got docker mailserver running in docker on my host. All of that's working for mail going to and from, and it's great. With one exception: mail generated on the host itself doesn't get delivered anywhere.

For example, running

echo 'this is my message' | mail [email protected] -s 'test message'

never arrives. Obviously I can't install postfix on the host to handle delivery because all those ports are open by DMS. So, how do I configure the host to be able to use DMS running in docker on the host to get delivery working?

[casperklein]

You can use nullmailer for that purpose. It can forward all local mails to docker-mailserver and doesn't require to bind port 25.