I am just not sure, for this domain SpaceMail.com, who has a CNAME to CDN for
the root domain, every query to this domain will get a CNAME. for instance,
This is a requirement of CNAME. If a domain has a CNAME, it can't have
anything else. See RFC1034 3.6.2. There is a minor exception, the CNAME
record may be signed by DNSSEC.
How does it get mail then? incoming mail was handled by
spacemail.com.cdn.cloudflare.net?
Impossible to tell what exact service Cloudflare is providing. It could
be as trivial as resolving the "spacemail.com.cdn.cloudflare.net" name
back to the original server, to routing the SMTP traffic back to some
server in a datacentre somewhere, or even providing SMTP ingress servers
around the globe. Whatever the exact implementation, the address that
the MX record resolves to, after following aliases, should accept mail
for the domain of the original MX lookup.
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