Removes all resource records from all domain's DNS zone:
# for i in `mysql -uadmin -p\`cat /etc/psa/.psa.shadow\` psa -Ns -e "select name from domains"`; do /usr/local/psa/bin/dns --del-all $i; done
Switches off DNS service for all domains:
# for i in `mysql -uadmin -p\`cat /etc/psa/.psa.shadow\` psa -Ns -e "select name from domains"`; do /usr/local/psa/bin/dns --off $i; done