mx.postal.ecs-ops.net.za has no CNAME records.
Question and response
Question
dig mx.postal.ecs-ops.net.za. NS
Answer
The response has no answer records.
Authority
ecs-ops.net.za. 3594 SOA pns101.cloudns.net. support.cloudns.net. 2026010604 7200 1800 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0