Email Error - 553 Relaying disallowed

Email Error - 553 Relaying disallowed

Hi,

I have tried to setup my mail account with my domain but am getting the below error when I send an email to my Zoho mail from an external email client.

' 553 Relaying disallowed'

I have setup all the DNS records as advised on Zoho mail setup instructions but this still does not seem to work.


Please can someone assist with this?

Regards,

Faisal