ns01.lwldns.de has no MX records.
Question and response
Question
dig ns01.lwldns.de. MX
Answer
The response has no answer records.
Authority
lwldns.de. 3600 SOA ns01.lwldns.de. noc.lwlcom.net. 2016091800 28800 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0