Registro DMARC
v=spf1 a -all

Servidores DNS Principal (mname) y Secundario (rname)
host: directfwd.com
class: IN
ttl: 300
type: SOA
mname: ns2096.ztomy.com
rname: abuse.opticaljungle.com
serial: 2011062801
refresh: 3600
retry: 900
expire: 604800
minimum-ttl: 86400

Información registro PTR (Reverso - Inverso)
host: directfwd.com
class: IN
ttl: 300
type: PTR
target: ns2096.ztomy.com

Información TXT
host: directfwd.com
class: IN
ttl: 300
type: TXT
txt: v=spf1 a -all
entries: Array