mazzo,
I am exactly like you, except opposite. I am going from Ubuntu to Red Hat just not by choice.
Here is a link that will help you with the Email (or any type of server). I have used the guides before and they are pretty good, you may have to tailor them to your needs but they are pretty start forward. Once you get used to a few commands you will like Ubuntu much better.
Here is the link:
https://help.ubuntu.com/community/Servers
The one really cool about Ubuntu or any Debian based OS is the package manager, apt-get install will do wonders for you, it resolve all the dependicies for you.
As far as the services RedEye hit it on the nose /etc/init.d/
service name start/stop/restart works great and fast too.
Enjoy!