Email Formats

{
  "mx": [
    "20 mailgw0.u-aizu.ac.jp.",
    "10 mailgw1.u-aizu.ac.jp."
  ],
  "spf": [
    "v=spf1 +ip4:163.143.1.40 +ip4:163.143.1.41 +ip4:13.231.2.145 +ip4:117.102.175.55 ~all"
  ]
}