unable to deliver your message

unable to deliver your message

I created email admin@beprudential.com in zoho mail and already set the MX Record to zohomail.com but i still got he following message :

Sorry, we were unable to deliver your message to the following address.

< admin@beprudential.com >:
Remote host said:
550 No Such User Here"
[RCPT_TO]

Please help me