mail.lanpartei.de has no CNAME records.
Question and response
Question
dig mail.lanpartei.de. NS
Answer
The response has no answer records.
Authority
lanpartei.de. 248 SOA a.ns.joker.com. hostmaster.joker.com. 2022122059 14400 3600 1209600 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0