Implimentation mail server , I need help

[mohamed_awamy]

Salamou aleikoum bothers , first I am sorry to write in english , because my PC can't accept arabic alphabet (frensh OS) and I am sorry for this bad english because I am beginner in it , so I want to make Email server in Local network or in my site , which can every visitor open his account in it , I will be very thankful if you help me ,
Salam