ns4.qlns.net has no MX records.
Question and response
Question
dig ns4.qlns.net. MX
Answer
The response has no answer records.
Authority
qlns.net. 600 SOA . admin.qlns.ch. 2025041605 600 600 600 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0