ns04.lwldns.com has no MX records.
Question and response
Question
dig ns04.lwldns.com. MX
Answer
The response has no answer records.
Authority
lwldns.com. 3600 SOA ns01.lwldns.de. noc.lwlcom.net. 2016091800 28800 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0