Unable to send message;Reason:553 Relaying disallowed. Invalid Domain

Unable to send message;Reason:553 Relaying disallowed. Invalid Domain

Hello,

We have a domain called "thedizongroup.com" with exabytes. It has expired for some reason but we already renewed it. Whenever we try to send an email we are getting: Unable to send message: Reason 553.

We tried to re-verify the MX records as instructed but it is failing.  See screenshot below.

Screen Shot 2021-09-17 at 7.31.50 AM.png

We see that the DNS records on our domain CPANEL have already propagated successfully. See https://www.whatsmydns.net/#MX/thedizongroup.com for more information.

What can we do to fix this?