nsc1.hostcolor.us has no MX records.
Question and response
Question
dig nsc1.hostcolor.us. MX
Answer
The response has no answer records.
Authority
nsc1.hostcolor.us. 86400 SOA nsc1.hostcolor.us. monitoring.hostcolor.com. 2026021601 3600 1800 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0