{
  "rules": [
    {
      "helper": "openssl",
      "template": "email = {{subject.mail.0}}"
    },
    {
      "helper": "certutil",
      "template": "email:{{subject.mail.0|quote}}"
    }
  ],
  "options": {
    "data_source": "subject.mail.0"
  }
}