dns-hotel.net has no MX records.
Question and response
Question
dig dns-hotel.net. MX
Answer
The response has no answer records.
Authority
dns-hotel.net. 900 SOA ns2.routing.net. hostmaster.dns-hotel.net. 2018033101 86400 7200 3600000 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0