This often happens when
you transfer your domain.
Let's say you added a domain name to your virtual server with
UCVHost, but the Internic record still points to the name server
where domain is still hosted. In this case our messages to you
do not leave UCVHost network and come to your new mail server
at UCVHost instead of going to your mail server that you currently
use.
To work around this problem please use an alternative e-mail
address that uses different mail server (another domain name).