Servidores DNS Principal (mname) y Secundario (rname)
host: protection.outlook.com
class: IN
ttl: 300
type: SOA
mname: ns1-35.azure-dns.com
rname: hostmaster.o365filtering.com
serial: 2024081305
refresh: 10800
retry: 3600
expire: 604800
minimum-ttl: 120

Información TXT
host: protection.outlook.com
class: IN
ttl: 90
type: TXT
txt: v=spf1 include:spf.protection.outlook.com -all
entries: Array