Not receiving notifications of form submission since custom DNS configured

DNS for is currently not configured correctly. [Support Guide] DNS Quick Start - How to set up DNS provides the required setup which is the apex should have an A record with the value (which it does) and the www sub-domain should have a CNAME record with the value (currently the CNAME value is

When it comes to receiving notifications, this is unlikely to work because there are no MX records configured.