vw-mms.de has no MX records.
Question and response
Question
dig vw-mms.de. MX
Answer
The response has no answer records.
Authority
vw-mms.de. 3600 SOA ns1.volkswagen.de. dns.volkswagen.de. 106 86400 10800 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0