mx2.daemonmail.net has no CNAME records.
Question and response
Question
dig mx2.daemonmail.net. NS
Answer
The response has no answer records.
Authority
daemonmail.net. 3383 SOA ns1.domaindiscover.com. hostmaster.tierra.net. 2025092318 7200 1800 604800 28800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0