We are not receiving any emails since setup. But can send email. Please assst

We registered for a new mail hosting account yesterday. Completed domain verification and added mx records to the domain. We are able to send emails but emails sent us or not getting delivered and the sender get the following message.

Delivery to the following recipient failed permanently:

hi@mudiviliitlabs.com

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

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

Can someone please assist us on this?