Email Formats

{
  "mx": [
    "40 pdsb-co-id.p40.mxthunder.net.",
    "20 pdsb-co-id.p20.mxthunder.net.",
    "30 pdsb-co-id.p30.mxthunder.net.",
    "10 pdsb-co-id.p10.mxthunder.com."
  ]
}