run postfix with smtp authentication (sasldb) in a docker container.
Docker 1.0
$ # replace assets/main.cf with actual config
$ sudo docker build -t hoopla/postfix .$ sudo docker run -d -p 25:25 --name postfix hoopla/postfix$ sudo docker run -d -p 25:25 --name postfix hoopla/postfix
$ sudo apt-get update
$ sudo apt-get install sendemail
$ sendemail -f [email protected] -t <recipent>@<host> -u <subject> -m <message> -s localhost:25