ns2.cid.de has no MX records.
Question and response
Question
dig ns2.cid.de. MX
Answer
The response has no answer records.
Authority
cid.de. 30 SOA ns1.cid.com. hostmaster.cid.com. 2026015131 10800 3600 604800 30
Additional
. 0 OPT ; payload 1400, xrcode 0, version 0, flags 0