This is a simple dockerfile recipe for creating a postfix docker and send spam.
docker build --rm -t snooze/postfix .
By the way, clean all the images you have by doint the following command:
sh -c 'docker rmi $(docker images -f "dangling=true" -q)'
sendemail -s <containter ip>:25 -f [email protected] -t [email protected] -u Hello again -m Hello again