We can fix the error “sender email address does not belong to the site domain.” by changing the email address.
We need the same domain name for From input field on the Mail tab.
Here website domain name is wpdebuglog.com and From is [email protected]example.com
We can fix it, by changing [email protected]example.com to [email protected]wpdebuglog.com
It will reduce the risk of spoofing.