Registro DMARC
v=DMARC1; p=reject; rua=mailto:dmarc_rua@emaildefense.proofpoint.com; ruf=mailto:dmarc_ruf@emaildefense.proofpoint.com; aspf=r; fo=1

Servidores DNS Principal (mname) y Secundario (rname)
host: argos-you-choose.com
class: IN
ttl: 21600
type: SOA
mname: edns63.ultradns.com
rname: dns-admin.sainsburys.co.uk
serial: 2018072915
refresh: 10800
retry: 1800
expire: 3600000
minimum-ttl: 86400

Información TXT
host: argos-you-choose.com
class: IN
ttl: 300
type: TXT
txt: v=spf1 -all
entries: Array