ns1.24unix.net has no MX records.
Question and response
Question
dig ns1.24unix.net. MX
Answer
The response has no answer records.
Authority
24unix.net. 3600 SOA ns1.24unix.net. tracer.24unix.net. 2026022100 14400 1800 604801 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0