mail not received

Hi

I set up zoho mail for the domain sungubala.co.za

I try send mail from another account.

The mail delivery fails with this error.

From: mailer-daemon@mail.zoho.com

This message was created automatically by mail delivery software.
A message that you sent could not be delivered to one or more of its recipients. This is a permanent error.

info@sungubala.co.za Invalid Address, ERROR_CODE :553, ERROR_CODE :sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1)

Please advise