o4.notifications.slc.gov has no MX records.
Question and response
Question
dig o4.notifications.slc.gov. MX
Answer
The response has no answer records.
Authority
slc.gov. 300 SOA authns2.qwest.net. abuse.centurylinkservices.net. 2260225000 10800 3600 604800 300
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0