ns.bmw.de has no MX records.
Question and response
Question
dig ns.bmw.de. MX
Answer
The response has no answer records.
Authority
bmw.de. 900 SOA ns.bmw.de. domadm.bmw.de. 2011122335 10800 3600 2592000 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0