KTNAPMGW711.grpitsrv.com has no MX records.
Question and response
Question
dig KTNAPMGW711.grpitsrv.com. MX
Answer
The response has no answer records.
Authority
grpitsrv.com. 1800 SOA ns1-05.azure-dns.com. azuredns-hostmaster.microsoft.com. 2019022593 900 600 86400 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0