Mail server, what should I use?

My company has recently taken over a small community network thoughout a village. They currently use MDaemon to do the emails but I would sooner take it out and replace it. Now as all good hosts im aiming to use linux as its free and stabe. I installed redhat as from reading in here this is one of the better distros to use for a hosting company. Only problem Im suffering from is how the hell do I configure it? Im quite a linux newbie and really do want to start learning it. So if there is a better/easier solution then please tell me. I have looked at this and was going to attempt to use this, I have the weekend to get something running, but before I did I thought I would ask here.

Suggestions?

 

 

 

 

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