Not receiving any mails

Hello,

I have just joined zoho.....my email is support@mobilescases.com

am not receiving any mail to this ID...i have tried sending to mails from this ID and its working fine. But when i try to send mails to this ID i got this msg :

Address not found

Your message wasn't delivered because the address support@mobilescases.com couldn't be found. Check for typos or unnecessary spaces and try again.

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This link will take you to a third-party site

The response from the remote server was:

550 5.1.1 <support@mobilescases.com> Recipient not found. <http://x.co/irbounce>

Final-Recipient: rfc822; support@mobilescases.com
Action: failed
Status: 5.1.1
Remote-MTA: dns; smtp.secureserver.net . (68.178.213.37, the server for the
domain mobilescases.com .)
Diagnostic-Code: smtp; 550 5.1.1 < support@mobilescases.com > Recipient not found. < http://x.co/irbounce >
Last-Attempt-Date: Thu, 19 Jan 2017 07:16:30 -0800 (PST)

Please tell me why am getting this issue.