Email Formats

{
  "spf": [
    "v=spf1 include:_spf.google.com include:spf.mandrillapp.com include:mail.zendesk.com include:servers.mcsv.net include:ip4:[1.2.3.4] include:cust-spf.exacttarget.com include:mailgun.org ~all"
  ]
}