Email Formats

{
  "mx": [
    "10 freemx2.sinamail.sina.com.cn.",
    "10 freemx3.sinamail.sina.com.cn.",
    "10 freemx1.sinamail.sina.com.cn."
  ],
  "spf": [
    "v=spf1 include:spf.sinamail.sina.com.cn -all"
  ]
}