Email Formats

{
  "mx": [
    "10 mxn.mxhichina.com.",
    "15 mxw.mxhichina.com.",
    "5 mx.sendgrid.net."
  ],
  "spf": [
    "v=spf1 include:spf.mxhichina.com include:sendgrid.net ~all"
  ]
}