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

Results formetal._spf.discoursemail.com

Resolver

Location

TXT

Name	TTL	Value
metal._spf.discoursemail.com	300	v=spf1 ip4:64.71.144.192/27 ip4:74.82.16.0/24 ip4:184.104.178.0/24 ip4:184.104.202.96/27 ip4:184.105.99.0/24 ip4:184.105.176.32/27 ip4:216.66.8.0/24 ip6:2602:fd3f:0:ff00::/56 ip6:2602:fd3f:1:ff00::/56 ip6:2602:fd3f:2:ff00::/56 ip6:2602:fd3f:3:ff00::/56 ~all