Email Formats

{
  "mx": [
    "10 mx-biz.mail.am0.yahoodns.net.",
    "30 mx5.biz.mail.yahoo.com.",
    "20 mx1.biz.mail.yahoo.com.",
    "0 mx-biz.mail.am0.yahoodns.net."
  ],
  "spf": []
}