[
  {
    "namespace": "messengerUtilities",
    "types": [
      {
        "id": "MailboxHeaders",
        "enums": {
          "bcc": {
            "annotations": [
              {
                "text": "Bcc recipients."
              }
            ]
          },
          "cc": {
            "annotations": [
              {
                "text": "Cc recipients."
              }
            ]
          },
          "from": {
            "annotations": [
              {
                "text": "Who the message is from."
              }
            ]
          },
          "reply-to": {
            "annotations": [
              {
                "text": "The address for replies."
              }
            ]
          },
          "resent-bcc": {
            "annotations": [
              {
                "text": "Bcc recipients of the resent message."
              }
            ]
          },
          "resent-cc": {
            "annotations": [
              {
                "text": "Cc recipients of the resent message."
              }
            ]
          },
          "resent-from": {
            "annotations": [
              {
                "text": "The sender of the resent message."
              }
            ]
          },
          "resent-reply-to": {
            "annotations": [
              {
                "text": "The reply-to address of the resent message."
              }
            ]
          },
          "resent-sender": {
            "annotations": [
              {
                "text": "The actual sender of the resent message."
              }
            ]
          },
          "resent-to": {
            "annotations": [
              {
                "text": "The primary recipients of the resent message."
              }
            ]
          },
          "sender": {
            "annotations": [
              {
                "text": "The actual sender of the message (may differ from <var>from</var>)."
              }
            ]
          },
          "to": {
            "annotations": [
              {
                "text": "The primary recipients of the message."
              }
            ]
          },
          "approved": {
            "annotations": [
              {
                "text": "The moderator approval header, used in mailing lists."
              }
            ]
          },
          "disposition-notification-to": {
            "annotations": [
              {
                "text": "The address to send return receipts to."
              }
            ]
          },
          "delivered-to": {
            "annotations": [
              {
                "text": "The address the message was delivered to."
              }
            ]
          },
          "return-receipt-to": {
            "annotations": [
              {
                "text": "The address to send return receipts to. (Deprecated.)"
              }
            ]
          },
          "mail-reply-to": {
            "annotations": [
              {
                "text": "The address for direct replies to the author (used in mailing lists)."
              }
            ]
          },
          "mail-followup-to": {
            "annotations": [
              {
                "text": "The address for follow-up messages (used in mailing lists)."
              }
            ]
          }
        }
      }
    ]
  }
]