Email Formats

{
  "mx": [
    "30 mx2.isf.edu.hk.",
    "50 mx3.isf.edu.hk.",
    "90 mx1.isf.edu.hk."
  ],
  "spf": [
    "v=spf1 ip4:113.28.9.128/26 ip4:210.177.217.192/28 a mx  include:_spf.google.com include:spf.protection.outlook.com -all"
  ]
}