problems w/ email during registration
 

sometime during registration i get refuse, because:
' invalid email [email protected]
Please go back and try again with a valid email address!'

the last time i got this message: http://sweetmoney.com/signup.php

i contacted one of such programs and support told me that i can try with any fake mail and then change it, but the situation was the same.

what can it be? is there a problem that i use everydns.net for my domain?