I Am Able to Send mail to the other users but not recieve in inbox.

Personally tried sending test mails and got this reply:

Delivery to the following recipient failed permanently:

      contacto@decoro.com.co

Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the server for the recipient domain  decoro.com.co  by  smtp.secureserver.net . [68.178.213.37].

The error that the other server returned was:
550 5.1.1 < contacto@decoro.com.co > Recipient not found.  < http://x.co/irbounce >

Please, Help me!