mail.ns3.24unix.net has no MX records.
Question and response
Question
dig mail.ns3.24unix.net. MX
Answer
The response has no answer records.
Authority
ns3.24unix.net. 3600 SOA ns.tyrion.24unix.net. root.tyrion.24unix.net. 2024071300 14400 1800 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0