filter.beveiligdweb.nl has no MX records.
Question and response
Question
dig filter.beveiligdweb.nl. MX
Answer
The response has no answer records.
Authority
beveiligdweb.nl. 300 SOA ns0.leaseweb.com. postmaster.leaseweb.com. 2020102800 10800 3600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0