75-149-129-229-Connecticut.hfc.comcastbusiness.net has no MX records.
Question and response
Question
dig 75-149-129-229-Connecticut.hfc.comcastbusiness.net. MX
Answer
The response has no answer records.
Authority
hfc.comcastbusiness.net. 900 SOA ns.hfc.comcastbusiness.net. dnsmaster.comcastonline.com. 2022956822 7200 300 604800 900
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0