Registro DMARC
v=spf1 mx a ptr ~all

Registro IPv4
host: certus-adm.pl
class: IN
ttl: 2397
type: A
ip: 89.161.222.244

Servidores DNS Principal (mname) y Secundario (rname)
host: certus-adm.pl
class: IN
ttl: 2397
type: SOA
mname: dns.home.pl
rname: admin.home.pl
serial: 1573213205
refresh: 14400
retry: 7200
expire: 2419200
minimum-ttl: 3600

Servidor de Correo
host: certus-adm.pl
class: IN
ttl: 2397
type: MX
pri: 10
target: certus-adm.pl

Información TXT
host: certus-adm.pl
class: IN
ttl: 90
type: TXT
txt: v=spf1 mx a ptr ~all
entries: v=spf1 mx a ptr ~all