mailfilter1.xs4all.be has no MX records.
Question and response
Question
dig mailfilter1.xs4all.be. MX
Answer
The response has no answer records.
Authority
xs4all.be. 28800 SOA ns1.evonet.be. hostmaster.evonet.be. 2025111401 21600 7200 2419200 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0