Eve Online Mail Header Structure

{
  "$schema": "https://json-structure.org/meta/core/v0/#",
  "$id": "https://api-evangelist.com/json-structure/eve-online-mailheader-structure.json",
  "name": "get_characters_character_id_mail_200_ok",
  "description": "200 ok object",
  "type": "object",
  "properties": {
    "from": {
      "type": "int32",
      "description": "From whom the mail was sent",
      "name": "get_characters_character_id_mail_from"
    },
    "is_read": {
      "type": "boolean",
      "description": "is_read boolean",
      "name": "get_characters_character_id_mail_is_read"
    },
    "labels": {
      "type": "array",
      "minimum": 0,
      "description": "labels array",
      "name": "get_characters_character_id_mail_labels",
      "items": {
        "type": "int32",
        "description": "label integer",
        "name": "get_characters_character_id_mail_label"
      }
    },
    "mail_id": {
      "type": "int32",
      "description": "mail_id integer",
      "name": "get_characters_character_id_mail_mail_id"
    },
    "recipients": {
      "type": "array",
      "description": "Recipients of the mail",
      "name": "get_characters_character_id_mail_recipients",
      "items": {
        "type": "object",
        "description": "recipient object",
        "name": "get_characters_character_id_mail_recipient",
        "required": [
          "recipient_type",
          "recipient_id"
        ],
        "properties": {
          "recipient_id": {
            "type": "int32",
            "description": "recipient_id integer",
            "name": "get_characters_character_id_mail_recipient_id"
          },
          "recipient_type": {
            "type": "string",
            "enum": [
              "alliance",
              "character",
              "corporation",
              "mailing_list"
            ],
            "description": "recipient_type string",
            "name": "get_characters_character_id_mail_recipient_type"
          }
        }
      }
    },
    "subject": {
      "type": "string",
      "description": "Mail subject",
      "name": "get_characters_character_id_mail_subject"
    },
    "timestamp": {
      "type": "datetime",
      "description": "When the mail was sent",
      "name": "get_characters_character_id_mail_timestamp"
    }
  }
}