It can be anything! An apex, subdomain, or even a URL.

Results fori.staff.mail.aliyun.com

Resolver

Location

TXT

Name	TTL	Value
i.staff.mail.aliyun.com	600	v=spf1 ip4:42.120.133.0/24 ip4:42.156.128.0/24 ip4:42.121.24.80 ip4:42.121.25.80 ip4:42.121.26.80 ip4:42.121.27.80 ip4:42.121.48.7 ip4:42.121.49.7 ip4:42.121.50.7 ip4:42.121.51.7 ip4:205.204.112.0/20 -all