mail24server.com has no MX records.
Question and response
Question
dig mail24server.com. MX
Answer
The response has no answer records.
Authority
mail24server.com. 3600 SOA ns1.name.com. hostmaster.nsone.net. 1626325689 43200 7200 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0