Problem #2
But, when i made emails i cant do users
Only give me the message: That User exists

Answer 2:
Well the problem was the hosts!!!

In my case:
Only i can send message, but i cant received!!
And what i do for this case to resolved that problem!?
Well the problem was the DNS of the server
Go to https://localhost:81
and then go to management - server - settings - DNS
Default NS1: 66.94.230.40 (yahoo dns)
Default NS2: 192.168.0.100 (localserver)
Default MX: On