Email Formats
{
"mx": [
"40 alt3.us.email.fireeyecloud.com.",
"20 alt1.us.email.fireeyecloud.com.",
"10 primary.us.email.fireeyecloud.com.",
"30 alt2.us.email.fireeyecloud.com."
],
"spf": [
"v=spf1 ip4:156.13.220.137 ip4:156.13.219.137 include:_spf.fireeyecloud.com -all"
]
}