stark.dslextreme.com has no MX records.
Question and response
Question
dig stark.dslextreme.com. MX
Answer
The response has no answer records.
Authority
dslextreme.com. 180 SOA ns11.constellix.com. dns.constellix.com. 2015010173 43200 3600 1209600 180
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0