$> sudo apt-get install sendmail
$> sudo apt-get install mailutils
$> sudo apt-get install postfix

To check If  postfix is installed and ready to work on your system, you can try:

$> mail info@ask-sheldon.com
Subject: TEST
TESTETST
EOT (Shortcut: ctrl + shift + d)

$> sudo dpkg-reconfigure postfix

$> /usr/sbin/sendmail -t << EOF
> To: marcel.lange@snsconsulting.de
> Subject: Test
> Blaasdn asndnasdaoisj aksmndcik
> EOF