" Delivery to the following recipient failed permanently:

     info@easyboardco.com

Technical details of permanent failure: 
Google tried to deliver your message, but it was rejected by the server for the recipient domain  easyboardco.com  by mx.easyboardco.com.cust.b.hostedemail.com. [64.98.36.4].

The error that the other server returned was:
554 5.7.1 < info@easyboardco.com >: Recipient address rejected: user  info@easyboardco.com  does not exist "

how can i fix this