Exim

Exim is a powerful Mail Transport Agent (MTA). It's the default MTA for Debian / Ubuntu.

Pre-installation
As only one MTA can be installed at the same time on a system, you might be required to unmerge an installed MTA. The package manager will report a block when another MTA is still installed. You can resolve this block by manually unmerging the old mail server. For example you can remove (which might have been installed as the default when a program requested a mail server to be installed) with this command:

Installation
Install :

Testing Exim
For the lay person, email your self, and don't forget to check the spam box. (if your email were to happen to be bunnyfoofoo@gmail.com):