Email Receiving

Email Receiving

I've set up my Zoho email account and have tried to send emails to it from yahoo mail and am recieving a failure.  Here is the error.
Sorry, we we re unable to deliver your message to the following address.

<john .doe@xyz.com >:
Remote host said:
554 5.7.1 <john.doe @xy.com >: Recipient address rejected: user john.doe @xyz.com  does not exist
[RCPT_TO]

What is the problem and how do I resolve?