Postfix docker

https://hub.docker.com/r/boky/postfix/

https://github.com/jeremybusk/docker-postfix

Alternatives

https://github.com/mail-in-a-box/mailinabox

https://github.com/eldada/postfix-relay-kubernetes

https://github.com/catatnight/docker-postfix

https://github.com/juanluisbaptiste/docker-postfix best?

https://github.com/jessfraz/dockerfiles/tree/master/postfix

https://github.com/noteed/docker-postfix/blob/master/Dockerfile

https://github.com/alterrebe/docker-mail-relay