mx.topconnect.ee has no CNAME records.
Question and response
Question
dig mx.topconnect.ee. NS
Answer
The response has no answer records.
Authority
topconnect.ee. 535 SOA ns1.topconnect.ee. root.ns1.topconnect.ee. 2026011400 3600 900 360000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0