Important SOA Parameters (1/2)

<primary_server>
e.g. "ns.wide.ad.jp."
should properly be configured for dynamic update

<admin_mail_address>
use "." instead of "@"
e.g. jinmei@kame.net -> jinmei.kame.net.
should be accurate in case of trouble
someone may help you with a valid contact point
do not simply copy it from other configurations