ns.amplitut.de has no MX records.
Question and response
Question
dig ns.amplitut.de. MX
Answer
The response has no answer records.
Authority
amplitut.de. 86400 SOA ns.amplitut.de. postmaster.amplitut.de. 2025112000 14400 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0