Email Formats

{
  "mx": [
    "10 hengli-com.corpsmtp.cn.",
    "5 hengli-com.corpsmtp.net.",
    "20 mdn.corp-email.cn.",
    "15 mdn.corpemail.net."
  ],
  "spf": [
    "v=spf1 include:_s.corp-email.com -all"
  ]
}