z.com has no AAAA records.
Apex domains cannot have CNAME records.
Google
Domain verification
google-site-verification=IRrhhfJ6evTnOekq8ChhshkO5o2F0-Yfng-3-AwOKi8
Microsoft
Domain verification
MS=ms32886022
spf2.0/pra include:_spf.z.com include:spf-a.z.com include:_spf.maildeliver.jp ~all
Zone apex
Start of authority
Email
Serial
2396445585
Refresh
2h 46m 40s
Retry
40m
Expire
7d
Negative cache TTL
30m