ns.cloudbear.eu has no MX records.
Question and response
Question
dig ns.cloudbear.eu. MX
Answer
The response has no answer records.
Authority
cloudbear.eu. 86382 SOA ns.cbws.nl. noc.cloudbear.nl. 2018092600 28800 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0