What is the name of the domain?
What is the issue you’re encountering
At mxtoolbox.com a strange hostname called _dc-mx.9a55ee8dbfdb.residir.de is displayed although my provider says it should be mail.residir.de What can I do?
Set the DNS record for mail to “DNS only” instead of proxied.
Since Cloudflare only proxies HTTP/HTTPS traffic, the MX record is automatically de-proxied for you.
https://cf.sjr.org.uk/tools/check?3b11b7c085d44af7a73ac1d987cba909#dns-mail
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