As above. The domain we have is northerndigitalcontracting.com and I can send emails from Zoho to email addresses in gmail and in Outlook. However, when I reply to emails from my Zoho account, or send new emails from gmail or outlook, I get the following response:

Final-Recipient: rfc822; chris@northerndigitalcontracting.com
Action: failed
Status: 5.1.1
Remote-MTA: dns; smtp.secureserver.net. (68.178.213.37, the server for the
 domain northerndigitalcontracting.com.)
Diagnostic-Code: smtp; 550 5.1.1 <chris@northerndigitalcontracting.com> Recipient not found.  <http://x.co/irbounce>
Last-Attempt-Date: Mon, 20 Mar 2017 02:24:34 -0700 (PDT)


---------- Forwarded message ----------
From: Chris Bradburn <chrisbradburn93@googlemail.com>
To: Chris Bradburn <chris@northerndigitalcontracting.com>
Cc: 
Bcc: 
Date: Mon, 20 Mar 2017 09:24:31 +0000
Subject: test