smtp; 553 Relaying disallowed

smtp; 553 Relaying disallowed

Dear Zoho,

I am unable to receive emails today. I have sent a test email from my gmail account, but have received the message :

Error Icon

Message not delivered

There was a problem delivering your message to info@idesignblinds.co.uk. See the technical details below.
The response was:

553 Relaying disallowed


Please can you help?


Kind regards,

Adam