Registro DMARC
v=spf1 -all

Registro IPv4
host: imss.com.mx
class: IN
ttl: 14399
type: A
ip: 64.190.63.222

Servidores DNS Principal (mname) y Secundario (rname)
host: imss.com.mx
class: IN
ttl: 21600
type: SOA
mname: ns1.sedoparking.com
rname: hostmaster.sedo.de
serial: 2018051601
refresh: 86400
retry: 10800
expire: 604800
minimum-ttl: 86400

Servidor de Correo
host: imss.com.mx
class: IN
ttl: 3600
type: MX
pri: 0
target: localhost

Información TXT
host: imss.com.mx
class: IN
ttl: 3600
type: TXT
txt: v=spf1 -all
entries: Array