mx.bzctoons.net has no CNAME records.
Question and response
Question
dig mx.bzctoons.net. NS
Answer
The response has no answer records.
Authority
bzctoons.net. 416 SOA ns1.bzctoons.net. bzctoons.gmail.com. 2026020100 3600 600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0