I have just transfered my email from 123 Reg to zoho, I tried sending a test email, to see if I could recieve it from zoho I am getting this message... what should I do?

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Delivery to the following recipient failed permanently:

     daniel@deeplearn.london

Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the server for the recipient domain deeplearn.london by  mx0.123-reg.co.uk .  [94.136.40.152 ].

The error that the other server returned was:
550 This domain is not hosted here

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Many thanks,

Mannix