Email Server Setup

Need help with setting up a dedicated linux email server. Already have purchased dedicated linux server from hosting company. I have special emailing software installed on my desktop and I want to configure the dedicated linux server to be used as a relay to send out the emails. Server Info: * Dedicated Linux server leased from hosting company * Runs Cent OS 6 -command line, no GUI. * \***|NEED PROGRAMMER ADVICE ON INSTALLING KDE GUI - PLEASE INCLUDE IN YOUR BID IF YOU WILL INSTALL KDE. What I need to be done: * Setup Sender Policy Framework (SPF) * Reverse DNS Setup * Reduce Retry Limits * Anything else associated with setting up a email server Also, I have purchased a domain name from a registrar and an unique IP address from a hosting company. Domain Name Setup: * Attach IP address to Domain name. Lastly I will need to write a guide on the whole processes including screenshots. Experience in setting up email servers a must!