64-57-166-139.static.bbtel.com has no MX records.
Question and response
Question
dig 64-57-166-139.static.bbtel.com. MX
Answer
The response has no answer records.
Authority
bbtel.com. 3600 SOA ns1.bbtel.com. adminblue.bbtel.com. 520800125 1200 180 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0