nocdb.nrw.net has no MX records.
Question and response
Question
dig nocdb.server.csl.de. MX
Answer
The response has no answer records.
Authority
csl.de. 300 SOA a.ns.nrw.net. hostmaster.joker.com. 2026030570 14400 3600 1209600 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0