Email Formats

{
  "mx": [
    "10 mx1c28.concentric.com.",
    "100 mx1c28.concentric.com.",
    "110 mx1c28.concentric.com.",
    "120 mx1c28.concentric.com."
  ],
  "spf": [
    "v=spf1 a mx ~all"
  ]
}