stsecuremail.stbank.net has no MX records.
Question and response
Question
dig stsecuremail.stbank.net. MX
Answer
The response has no answer records.
Authority
stbank.net. 3600 SOA ns9.customer.level3.net. dns.level3.net. 2025060601 10800 3600 2592000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0