Registro DMARC
v=DMARC1; p=quarantine; fo=1; aspf=s; adkim=s;

Registro IPv4
host: protonmail.ch
class: IN
ttl: 306
type: A
ip: 185.70.42.21

Servidores DNS Principal (mname) y Secundario (rname)
host: protonmail.ch
class: IN
ttl: 1200
type: SOA
mname: ns1.protonmail.ch
rname: support.protonmail.ch
serial: 2503031514
refresh: 1200
retry: 144
expire: 1814400
minimum-ttl: 7200

Servidor de Correo
host: protonmail.ch
class: IN
ttl: 802
type: MX
pri: 10
target: mailsec.protonmail.ch

Servidor de Correo
host: protonmail.ch
class: IN
ttl: 802
type: MX
pri: 5
target: mail.protonmail.ch

Información TXT
host: protonmail.ch
class: IN
ttl: 1200
type: TXT
txt: abuseipdb-verification=SLIfh7Wm
entries: Array

Información TXT
host: protonmail.ch
class: IN
ttl: 1200
type: TXT
txt: google-site-verification=-5wo7THYiFWoq_XABAwEtMrcTdjtiNBHrmBlIWtocqM
entries: Array

Información TXT
host: protonmail.ch
class: IN
ttl: 1200
type: TXT
txt: google-site-verification=XFWl0NLw1rOXu2_PafVbnwk1cCd2Oz-cpfwM2crfrYM
entries: Array

Información TXT
host: protonmail.ch
class: IN
ttl: 1200
type: TXT
txt: mailru-verification: f224f0d86fde9b63
entries: Array

Información TXT
host: protonmail.ch
class: IN
ttl: 1200
type: TXT
txt: v=spf1 include:_spf.protonmail.ch ~all
entries: Array