mail.indivsurvey.de has no MX records.
Question and response
Question
dig mail.indivsurvey.de. MX
Answer
The response has no answer records.
Authority
indivsurvey.de. 300 SOA ns1.first-ns.de. dns.hetzner.com. 2025102900 300 300 604800 300
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0