Linux Mail Server: Exim4

sudo apt-get install exim4
sudo dpkg-reconfigure exim4-config

http://bradthemad.org/tech/notes/exim_cheatsheet.php

STARTTLS

https://wiki.debian.org/Exim

Troubleshooting

exim4 -bP | grep tls_

test with:

sudo apt-get install swaks
swaks -a -tls -q HELO -s gollum.redactate.com -au test -ap '<>'

1. Choose internet site
2. Choose domain

configuration (mp4)