OK , I must be a tool but when I look for info on a mail server I never seem to get the answer to this question. Here is the deal. I want to set up some type of mail server that I can have email@example.com type of e-mail addresses. Do I need a registered domain name to be able to access this server from any client or can I do it through IP address? Say someone sends mail to firstname.lastname@example.org, how does it know which server to go to? I have read tons of mail stuff so maybe I am just thick headed but is just wont click with me. Someone please kick me so I can understand.