I have not receive the email verification

The registration only gets recorded if the user enters the code sent by email. If he/she closes the window, etc, the registration won't be recorded so he/she can register again.

The "Junk" or "Spam" folder are the typical way email servers deal with what they don't know but sometimes, the email can even be blocked right before it reaches the user's inbox.

Adding the "neobux.com" domain to the list of trusted senders is a good way if nothing is in the spam folder. This action needs to be done in the email's internet page itself and not in a client (such as outlook) as the clients do not send that information back to the email server.