http://serverfault.com/questions/824988/what-secure-and-good-options-are-there-for-hosting-own-private-mail-server

Somehow the questions asked are not related to the topic of the forum which is for questions about:



  * managing the hardware or software of servers, workstations, storage or networks
  * tools used for administering, monitoring, or automating these
  *  deployment to and management of third-party provided information technology platforms