I can send out email on admin@hdfcsinpower.com but i could not receive any.

The error message for delivery failure is as following: 

Could not deliver message to the following recipient(s):

 

Failed Recipient: admin@hdfcsinpower.com

Reason: Remote host said: 550 5.1.1 <admin@hdfcsinpower.com> Recipient not found.  <http://x.co/irbounce>

Please provide support.

Thanks