ns2.openprovider.be has no MX records.
Question and response
Question
dig ns2.openprovider.be. MX
Answer
The response has no answer records.
Authority
openprovider.be. 600 SOA ns-eu-west-2.openprovider.eu. sre.openprovider.nl. 2022122002 3600 600 604800 600
Additional
. 0 OPT ; payload 1680, xrcode 0, version 0, flags 0