Primary (Self-Hosted):
 ______ _________ ______ _____     __               
|      |   ___   |      |  |  |.--|  |  .----.-----.
|  --  |  |  _   |  --  |__    |  _  |__|  __|  _  |
|______|  |______|______|  |__||_____|__|____|_____|
       |_________|                                  
or posmaster/root