server:
  interface: 0.0.0.0
  access-control: 100.64.0.0/10 allow

  local-zone: "isp-a.sns." static
  local-data: "smtp.isp-a.sns. IN A 100.120.1.2"
  local-data: "mail.isp-a.sns. IN A 100.120.1.2"
  local-data: "ns.isp-a.sns. IN A 100.120.1.2"
  local-data: "isp-a.sns. IN MX 10 smtp.isp-a.sns."

  local-zone: "120.100.in-addr.arpa." static
  local-data: "2.1.120.100.in-addr.arpa. IN PTR smtp.isp-a.sns"
  local-data: "2.0.120.100.in-addr.arpa. IN PTR home.isp-a.sns"
  local-data: "1.1.120.100.in-addr.arpa. IN PTR router.isp-a.sns"
  local-data: "1.0.120.100.in-addr.arpa. IN PTR router.isp-a.sns"