Registro DMARC
v=DMARC1; p=reject

Servidores DNS Principal (mname) y Secundario (rname)
host: s45.it
class: IN
ttl: 19186
type: SOA
mname: ns-1755.awsdns-27.co.uk
rname: domain.mailup.it
serial: 1
refresh: 7200
retry: 3600
expire: 604800
minimum-ttl: 10800

Información TXT
host: s45.it
class: IN
ttl: 8386
type: TXT
txt: spf2.0/pra ip4:93.174.64.0/21 include:musvc.com -all
entries: Array

Información TXT
host: s45.it
class: IN
ttl: 8386
type: TXT
txt: v=spf1 ip4:93.174.64.0/21 include:musvc.com -all
entries: Array