mx00.eyepin.com has no CNAME records.
Question and response
Question
dig mx00.eyepin.com. NS
Answer
The response has no answer records.
Authority
eyepin.com. 2606 SOA nsa.eyepin.at. root.eyepin.at. 2025112602 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0