For my domain, canon.org, my Cloudflare panel shows the configuration as:
TYPE NAME MAIL SERVER TTL PRIORITY
MX CANON.ORG MAIL.CANON.ORG AUTO 0
but when I do an NSLOOKUP the results show:
MAIL SERVER PRIORITY REVALIDATE IN
_dc-mx.b3d2581e4494.canon.org 0 5 Min
I have no idea where the dc-mx… is coming from but it, or something else, is causing a problem for my email routing. Can you please advise me what I need to do to correct this if its not something under your control?
Welcome to the Cloudflare Community.
The invalid synthetic hostname that begins with
_dc-mx us a well-meaning but ineffective attempt by Cloudflare to work around your use of an incompatible proxy setting on the hostname you have entered in your MX.
The Cloudflare proxy supports HTTP and HTTPS protocols, but not email protocols. This means that you will need to set the hostname used in your MX to DNS Only.
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