Emails delivery fail

hi,
when someone send email get this message

Address not found

Your message wasn’t delivered to ** ** because the address couldn’t be found or is unable to receive email.
The response from the remote server was:

550 5.1.1 Domain does not exist. nZR6RT57lKtd

how i solve this issue?

Hello there,

You’ve no DNS record. Check it out:

Fixing that might solve step by step

so if the domain is not published the email will not receive emails?

Not so. As per my knowledge, DNS records are essential.
Doc says: It is available to all Cloudflare customers using Cloudflare as an authoritative nameserver. Read more here: