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

Results for_spf.postermail.com

Resolver

Location

TXT

Name	TTL	Value
_spf.postermail.com	300	v=spf1 ip4:142.132.134.27 ip4:162.120.16.177 ip4:78.46.82.146 ip4:178.63.189.208/28 ip4:162.120.16.170 ip4:162.120.16.154 ip4:162.120.16.138 ip4:162.120.17.93 ip4:162.120.17.89 ip4:162.120.17.86 ip4:162.120.17.82 ip4:162.120.17.8 ip4:162.120.17.76 ip4:162 .120.17.65 ip4:162.120.17.54 ip4:162.120.17.31 ip4:162.120.17.23 ip4:162.120.17.15 ip4:162.120.17.121 ~all