Servidores DNS Principal (mname) y Secundario (rname)
host: protection.outlook.com
class: IN
ttl: 3600
type: SOA
mname: va3netglb002.messaging.microsoft.com.protection.outlook.com
rname: hostmaster.va3netglb002.messaging.microsoft.com.protection.outlook.com
serial: 2024070697
refresh: 10800
retry: 3600
expire: 604800
minimum-ttl: 120

Información TXT
host: protection.outlook.com
class: IN
ttl: 300
type: TXT
txt: v=spf1 include:spf.protection.outlook.com -all
entries: Array