Registro DMARC
v=DMARC1; p=reject; sp=reject; pct=100; fo=1; rua=mailto:dmarcagg.bto@btopenworld.com;ruf=mailto:dmarcf.bto@btopenworld.com;

Servidores DNS Principal (mname) y Secundario (rname)
host: btopenworld.com
class: IN
ttl: 21600
type: SOA
mname: eddns0.bt.com
rname: zzdnsr.bt.com
serial: 54
refresh: 10800
retry: 3600
expire: 604800
minimum-ttl: 86400

Servidor de Correo
host: btopenworld.com
class: IN
ttl: 15459
type: MX
pri: 1
target: mx.lb.btopenworld.com

Información TXT
host: btopenworld.com
class: IN
ttl: 90
type: TXT
txt: v=spf1 include:_spf.btinternet.com include:bt.com ~all
entries: Array

Información TXT
host: btopenworld.com
class: IN
ttl: 90
type: TXT
txt: 7c6xqrd8pvtt034wtd9cglp259hzy6k3
entries: Array

Información TXT
host: btopenworld.com
class: IN
ttl: 90
type: TXT
txt: qhdnx37lfp67m6r26tz1zh2spt7v5xxp
entries: Array

Información TXT
host: btopenworld.com
class: IN
ttl: 90
type: TXT
txt: 6bgvgds73f6g3tvj48lclzs28frph27p
entries: Array