Apex domains cannot have CNAME records.
Question and response
Question
dig myservices.email. NS
Answer
myservices.email. 5 NS nsp.dnsnode.net.
myservices.email. 5 NS ns3.myservices.domains.
myservices.email. 5 NS ns1.myservices.domains.
myservices.email. 5 NS europe1.dnsnode.net.
myservices.email. 5 NS ns2.myservices.domains.
Authority
The response has no authority records.
Additional
ns1.myservices.domains. 5 A 198.50.216.33
ns2.myservices.domains. 5 A 192.174.68.97
ns3.myservices.domains. 5 A 176.97.158.97
ns2.myservices.domains. 5 AAAA 2001:67c:1bc:0:0:0:0:97
ns3.myservices.domains. 5 AAAA 2001:67c:10b8:0:0:0:0:97
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0