mail.tyrala.de has no CNAME records.
Question and response
Question
dig mail.tyrala.de. NS
Answer
The response has no answer records.
Authority
tyrala.de. 900 SOA dns.tyrala.de. valentin\.tyrala.gmx.de. 2026022504 1200 300 1209600 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0