ukel19is07.eemsg.mail.mil has no MX records.
Question and response
Question
dig ukel19is07.eemsg.mail.mil. MX
Answer
The response has no answer records.
Authority
mail.mil. 1800 SOA sdns3.csd.disa.mil. disa.tinker.ie.list.dci-ii-dns.mail.mil. 2026030401 3600 600 2592000 1800
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0