I have set up my site brokentotem.com to point at zoho mail servers but I can't receive any mail.

I sent an email from an external email address to an email address on my domain, and the email never got through. Instead an email was sent back to the sender with the error:  Remote server returned an error -> 553 Relaying disallowed.  The email address I used does exist in control panel though, and it states the MX records are correct.

I also have this warning in my control panel, even though I've set it up per the documentation:

Can you please help me solve these issues as I am concerned about the down time. Thank you.