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

Results forspf-sg.qcloudmail.com

Resolver

Location

TXT

Name	TTL	Value
spf-sg.qcloudmail.com	600	v=spf1 ip4:43.156.0.0/16 ip4:43.134.0.0/16 ip4:150.109.0.0/16 ip4:129.226.0.0/16 ip4:119.28.0.0/16 ip4:43.155.0.0/16 ip4:43.153.0.0/16 ip4:43.163.0.0/16 ip4:43.140.0.0/16 ip4:43.173.0.0/16 ~all