c.myradns.de has no MX records.
Question and response
Question
dig c.myradns.de. MX
Answer
The response has no answer records.
Authority
myradns.de. 300 SOA a. info.myradns.net. 2022020822 3600 900 2419200 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0