gerwanserver.de has no MX records.
Question and response
Question
dig gerwanserver.de. MX
Answer
The response has no answer records.
Authority
gerwanserver.de. 42300 SOA ns15.domserver.de. oo.gerwan.de. 2025111203 43200 14400 604800 42300
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0