ns2.volkswagen.de has no MX records.
Question and response
Question
dig ns2.volkswagen.de. MX
Answer
The response has no answer records.
Authority
volkswagen.de. 7200 SOA ns1.volkswagen.de. dns.volkswagen.de. 2012043545 86400 7200 604800 14400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0