Email Formats

{
  "mx": [
    "10 cdn.corp-email.cn.",
    "20 mail.biz-email.net.",
    "30 cnc.biz-email.net.",
    "5 cdn.corpemail.net."
  ],
  "spf": [
    "v=spf1 mx mx:mail.itr.cn ip4:202.177.31.253 ~all"
  ]
}