Apex domains cannot have CNAME records.
Question and response
Question
dig spacemail.com. NS
Answer
spacemail.com. 5 NS launch1.spaceship.com.
spacemail.com. 5 NS launch2.spaceship.com.
Authority
The response has no authority records.
Additional
launch1.spaceship.com. 5 A 2.16.130.65
launch1.spaceship.com. 5 A 95.100.175.67
launch1.spaceship.com. 5 A 172.64.52.133
launch1.spaceship.com. 5 A 193.108.91.149
launch2.spaceship.com. 5 A 2.22.230.67
launch2.spaceship.com. 5 A 23.211.132.64
launch2.spaceship.com. 5 A 96.7.49.64
launch2.spaceship.com. 5 A 172.64.53.166
launch1.spaceship.com. 5 AAAA 2600:1401:2:0:0:0:0:95
launch1.spaceship.com. 5 AAAA 2600:1480:9800:0:0:0:0:41
launch1.spaceship.com. 5 AAAA 2606:4700:52:0:0:0:ac40:3485
launch1.spaceship.com. 5 AAAA 2a02:26f0:67:0:0:0:0:43
launch2.spaceship.com. 5 AAAA 2600:1406:1b:0:0:0:0:40
launch2.spaceship.com. 5 AAAA 2600:1408:1c:0:0:0:0:40
launch2.spaceship.com. 5 AAAA 2600:1480:800:0:0:0:0:43
launch2.spaceship.com. 5 AAAA 2606:4700:5a:0:0:0:ac40:35a6
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0