nc.de has no MX records.
Question and response
Question
dig nc.de. MX
Answer
The response has no answer records.
Authority
nc.de. 3600 SOA ns1.netcologne.de. hostmaster.netcologne.de. 2025050701 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0