Registro DMARC
v=DMARC1; p=reject; aspf=s; adkim=s; rua=mailto:dmarc-rua@datahouse.ch

Servidores DNS Principal (mname) y Secundario (rname)
host: dataproject.ch
class: IN
ttl: 600
type: SOA
mname: a.datadns.ch
rname: master.datadns.ch
serial: 1
refresh: 7200
retry: 120
expire: 1209600
minimum-ttl: 600