Apex domains cannot have CNAME records.
Question and response
Question
dig qemailserver.com. NS
Answer
qemailserver.com. 5 NS dns3.p08.nsone.net.
qemailserver.com. 5 NS pdns111.ultradns.net.
qemailserver.com. 5 NS dns2.p08.nsone.net.
qemailserver.com. 5 NS pdns111.ultradns.com.
qemailserver.com. 5 NS dns1.p08.nsone.net.
qemailserver.com. 5 NS pdns111.ultradns.biz.
qemailserver.com. 5 NS dns4.p08.nsone.net.
qemailserver.com. 5 NS pdns111.ultradns.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0