Mail getting bounced if we sent it from gmail or hotmail

Mail getting bounced if we sent it from gmail or hotmail

I have configured zoho for my friend domain iakrfilms.com. Domain got Verified, MX got verified, DKIM got verified. I am able to send/receive email from Zoho. I am able to send email to gmail and hotmail but mails responded from gmail and hotmail are bouncing back. 

I am getting below response from gmail. Can you have it fixed?

Regards,
-Fayaz
The response was:

550 No Such User Here

Final-Recipient: rfc822;  itadmin@iakrfilms.com
Action: failed
Status: 5.0.0
Remote-MTA: dns;  mail.iakrfilms.com . (74.220.207.163, the server for the
 domain  iakrfilms.com .)
Diagnostic-Code: smtp; 550 No Such User Here
Last-Attempt-Date: Sat, 25 Nov 2017 19:06:07 -0800 (PST)