Both my 2 most important domains have lost ALL email functionality! This happened right after i transferred the registrar of my .tv domain to Cloudflare today! The other .com domain was already with Cloudflare with no issue - until today!
Message not delivered
There was a problem delivering your message to [email protected] . See the technical details below.
take a look at the MX records on your DNS entries on Cloudflare as they might be missing. I had an issue where CF didn’t transfer all my DNS records so had to add them manually. I took a screenshot of my previous DNS entries before transferring them so I could compare them.
On the DNS page of CF you should get a message related to MX, SPF, etc entries needed and use the current MX you have on the other domains as reference.