I found this series of articles very helpful, if a bit verbose - http://arstechnica.com/information-technology/2014/02/how-to-run-your-own-e-mail-server-with-yo

I found this series of articles very helpful, if a bit verbose - http://arstechnica.com/information-technology/2014/02/how-to-run-your-own-e-mail-server-with-your-own-domain-part-1/ http://arstechnica.com/information-technology/2014/02/how-to...