ns2.stbank.com has no MX records.
Question and response
Question
dig ns2.stbank.com. MX
Answer
The response has no answer records.
Authority
stbank.com. 300 SOA ns1.telcove.net. dns.level3.net. 2025091712 7200 600 1036800 300
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0