ns2.zayo.us has no MX records.
Question and response
Question
dig ns2.zayo.us. MX
Answer
The response has no answer records.
Authority
zayo.us. 3600 SOA ns.zayo.com. nopss.zayo.us. 2026011301 14400 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0