imap-test.neobee.net has no CNAME records.
Question and response
Question
dig imap-test.neobee.net. NS
Answer
The response has no answer records.
Authority
neobee.net. 1698 SOA pcelica.neobee.net. dns.neobee.net. 2021112301 28800 14400 3600000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0