mx.civica.com has no NS records.
NS records for this zone are defined at civica.com.
NS records for this zone are defined at civica.com.
Question and response
Question
dig uks.smtp.exch.eit.civica.com. NS
Answer
The response has no answer records.
Authority
eit.civica.com. 300 SOA ns1-05.azure-dns.com. hostmaster.eit.civica.com. 1 3600 300 2419200 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0