Registro DMARC
v=DMARC1; p=reject; pct=100; sp=reject

Servidores DNS Principal (mname) y Secundario (rname)
host: rmstafford.com
class: IN
ttl: 1800
type: SOA
mname: blue.foundationdns.com
rname: dns.cloudflare.com
serial: 2405231801
refresh: 10000
retry: 2400
expire: 604800
minimum-ttl: 1800

Información TXT
host: rmstafford.com
class: IN
ttl: 8037
type: TXT
txt: v=spf1 -all
entries: Array