Registro DMARC
v=DMARC1; p=reject; rua=mailto:postmaster@cheshirelabs.com

Servidores DNS Principal (mname) y Secundario (rname)
host: cheshirelabs.com
class: IN
ttl: 1553
type: SOA
mname: amy.ns.cloudflare.com
rname: dns.cloudflare.com
serial: 2418207305
refresh: 10000
retry: 2400
expire: 604800
minimum-ttl: 1800

Información TXT
host: cheshirelabs.com
class: IN
ttl: 53
type: TXT
txt: v=spf1 mx -all
entries: v=spf1 mx -all