Email Formats

{
  "mx": [
    "5 smtp.ustc.edu.cn.",
    "5 smtp2.ustc.edu.cn."
  ],
  "spf": [
    "v=spf1 ip4:202.38.64.8 ip4:202.38.64.16 ip4:202.38.64.46 ip4:210.45.120.152 ip4:202.141.161.73 ip4:195.128.10.69 ip4:199.168.14.54 ip4:202.141.163.236 ip4:205.201.128.18 ip4:210.45.71.12 ip4:195.128.10.18 ip4:195.128.10.15 -all"
  ]
}