Email Formats

{
  "mx": [
    "0 mail.sunway.cc."
  ],
  "spf": [
    "v=spf1 mx a ptr ip4:192.168.2.1/32 ip4:192.168.3.1/32 ip4:10.0.0.254/32 ip4:60.248.107.208/32 ip6:2001:b030:2217:ff9c::1/64 ~all"
  ]
}