My user ID is admin@laentrega.com.mx 

I can send emails to other email IDs and when I respond back from one of those IDs I get the following error notification

Delivery to the following recipient failed permanently:

      admin@laentrega.com.mx

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

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

I googled your forum questios and posts by other users on similar issue. I also checked the MX setup and it seems to be correct. Not able to figure out whats broken.

Could you please help ?

Regards

Vivek Sahay