Email Formats

{
  "mx": [
    "10 mx2.trip.com.ctripgslb.com.",
    "50 mx3.trip.com.ctripgslb.com.",
    "10 mx1.trip.com.ctripgslb.com."
  ],
  "spf": [
    "v=spf1 include:spf.trip.com -all"
  ]
}