mx2.michigandigital.com has no MX records.
Question and response
Question
dig mx2.michigandigital.com. MX
Answer
The response has no answer records.
Authority
michigandigital.com. 1800 SOA monika.ns.cloudflare.com. dns.cloudflare.com. 2397107064 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0