st-bank.com has no MX records.
Question and response
Question
dig st-bank.com. MX
Answer
The response has no answer records.
Authority
st-bank.com. 3600 SOA ns9.customer.level3.net. dns.level3.net. 2011111200 10800 3600 2592000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0