Create a C++ Server like http://www.codecrafters.com/abilitymailserver/ -- 3

Create a C++ Or C# Server like [login to view URL] (Enterprise version) Nb: if you have question about this server, please install it and see it in action. 1. Server must be 100% like this (offer all options of) [login to view URL] (Enterprise version); 2. You create only a "Mail Server" not a website like "code [login to view URL]"; 3. The code must be coded by you. No purchase, no copy/past, but writen from scratch be you (you can use GNU library); 4. Code must be 100% C++ or C# (I don't accept any other langage); 5. No GUI, no WebMail (but only this remote admin to configure server. Remote admin must be written in php). 6. Windows & linux version NB 1: Code will be compiled under VS2015 (for windows).