I have purchased a domain and mail hosting plan from zoho.  I can send an email from the account, but not receive an email.  

When I try sending from my gmail I get this:

Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the server for the recipient domain  dcgeophysics.com  by  smtp.secureserver.net . [72.167.238.29].

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

Need some help here.  I've got work that I need to do with this email address today, but don't want to contact a customer until he will be able to reply to me.

Thanks
Dan