Issues with incoming email - could you give me a hand please?

Issues with incoming email - could you give me a hand please?

Hi there,

Thanks for the service. I can't get incoming email going though for pickaplace.com.

Outgoing works fine but incoming mail always gets bounced with:
The response was:

553 Relaying disallowed


Final-Recipient: rfc822; alan@pickaplace.com
Action: failed
Status: 5.0.0
Remote-MTA: dns; mx.zoho.eu. (31.186.226.32, the server for the domain pickaplace.com.)
Diagnostic-Code: smtp; 553 Relaying disallowed
Last-Attempt-Date: Sun, 24 Sep 2017 05:48:00 -0700 (PDT)

Can you help me please? Any suggstions gratefully received!
Thanks,
Alan