Email Formats

{
  "mx": [
    "10 mx3.ipengines.net.",
    "10 mx7.ipengines.net.",
    "10 mx4.ipengines.net.",
    "10 mx6.ipengines.net.",
    "10 mx2.ipengines.net.",
    "10 mx5.ipengines.net."
  ]
}