mails.pressfile.de has no CNAME records.
Question and response
Question
dig mails.pressfile.de. NS
Answer
The response has no answer records.
Authority
pressfile.de. 3430 SOA hydrogen.ns.hetzner.com. dns.hetzner.com. 2025102200 86400 10800 3600000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0