azuregov-dns.us has no MX records.
Question and response
Question
dig azuregov-dns.us. MX
Answer
The response has no answer records.
Authority
azuregov-dns.us. 3600 SOA azuregov-dns.us. msnhst.microsoft.com. 1 7200 900 2419200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0