Twilio · Schema

SendEmailRequest

AuthenticationCommunicationsContact CenterEmailIoTMessagingPhoneSMST1VerificationVideoVoiceTwilioTelecommunicationsReal-TimeWhatsApp

Properties

Name	Type	Description
personalizations	array	Recipients and per-recipient settings
from	object
reply_to	object
reply_to_list	array
subject	string	Global subject line
content	array
attachments	array
template_id	string	ID of a dynamic template to use
headers	object
categories	array	Categories for tracking (max 10)
send_at	integer	Unix timestamp for scheduled send (up to 72 hours)
batch_id	string	Batch ID for grouping scheduled sends
asm	object
ip_pool_name	string	Name of the IP pool for sending
tracking_settings	object

View JSON Schema on GitHub

JSON Schema

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://raw.githubusercontent.com/api-evangelist/twilio/main/json-schema/twilio-send-email-request-schema.json",
  "title": "SendEmailRequest",
  "x-generated": "2026-10-08",
  "x-method": "derived",
  "x-generator": "derive-json-schema.py",
  "x-source": "openapi/twilio-mail-send-api-openapi.yml#/components/schemas/SendEmailRequest",
  "type": "object",
  "required": [
    "personalizations",
    "from"
  ],
  "properties": {
    "personalizations": {
      "type": "array",
      "items": {
        "$ref": "#/$defs/Personalization"
      },
      "minItems": 1,
      "maxItems": 1000,
      "description": "Recipients and per-recipient settings"
    },
    "from": {
      "$ref": "#/$defs/EmailAddress"
    },
    "reply_to": {
      "$ref": "#/$defs/EmailAddress"
    },
    "reply_to_list": {
      "type": "array",
      "items": {
        "$ref": "#/$defs/EmailAddress"
      },
      "maxItems": 1000
    },
    "subject": {
      "type": "string",
      "description": "Global subject line"
    },
    "content": {
      "type": "array",
      "items": {
        "type": "object",
        "required": [
          "type",
          "value"
        ],
        "properties": {
          "type": {
            "type": "string",
            "description": "MIME type (text/plain or text/html)"
          },
          "value": {
            "type": "string",
            "description": "Content body"
          }
        }
      }
    },
    "attachments": {
      "type": "array",
      "items": {
        "$ref": "#/$defs/Attachment"
      }
    },
    "template_id": {
      "type": "string",
      "description": "ID of a dynamic template to use"
    },
    "headers": {
      "type": "object",
      "additionalProperties": {
        "type": "string"
      }
    },
    "categories": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "maxItems": 10,
      "description": "Categories for tracking (max 10)"
    },
    "send_at": {
      "type": "integer",
      "description": "Unix timestamp for scheduled send (up to 72 hours)"
    },
    "batch_id": {
      "type": "string",
      "description": "Batch ID for grouping scheduled sends"
    },
    "asm": {
      "type": "object",
      "properties": {
        "group_id": {
          "type": "integer",
          "description": "Unsubscribe group ID"
        },
        "groups_to_display": {
          "type": "array",
          "items": {
            "type": "integer"
          },
          "maxItems": 25
        }
      }
    },
    "ip_pool_name": {
      "type": "string",
      "description": "Name of the IP pool for sending"
    },
    "tracking_settings": {
      "type": "object",
      "properties": {
        "click_tracking": {
          "type": "object",
          "properties": {
            "enable": {
              "type": "boolean"
            },
            "enable_text": {
              "type": "boolean"
            }
          }
        },
        "open_tracking": {
          "type": "object",
          "properties": {
            "enable": {
              "type": "boolean"
            },
            "substitution_tag": {
              "type": "string"
            }
          }
        },
        "subscription_tracking": {
          "type": "object",
          "properties": {
            "enable": {
              "type": "boolean"
            }
          }
        }
      }
    }
  },
  "$defs": {
    "Attachment": {
      "type": "object",
      "required": [
        "content",
        "filename"
      ],
      "properties": {
        "content": {
          "type": "string",
          "description": "Base64 encoded attachment content"
        },
        "filename": {
          "type": "string"
        },
        "type": {
          "type": "string",
          "description": "MIME type of the attachment"
        },
        "disposition": {
          "type": "string",
          "enum": [
            "inline",
            "attachment"
          ],
          "default": "attachment"
        },
        "content_id": {
          "type": "string",
          "description": "Content ID for inline attachments"
        }
      }
    },
    "EmailAddress": {
      "type": "object",
      "required": [
        "email"
      ],
      "properties": {
        "email": {
          "type": "string",
          "format": "email"
        },
        "name": {
          "type": "string"
        }
      }
    },
    "Personalization": {
      "type": "object",
      "required": [
        "to"
      ],
      "properties": {
        "to": {
          "type": "array",
          "items": {
            "$ref": "#/$defs/EmailAddress"
          },
          "minItems": 1
        },
        "cc": {
          "type": "array",
          "items": {
            "$ref": "#/$defs/EmailAddress"
          }
        },
        "bcc": {
          "type": "array",
          "items": {
            "$ref": "#/$defs/EmailAddress"
          }
        },
        "subject": {
          "type": "string"
        },
        "headers": {
          "type": "object",
          "additionalProperties": {
            "type": "string"
          }
        },
        "substitutions": {
          "type": "object",
          "additionalProperties": {
            "type": "string"
          }
        },
        "dynamic_template_data": {
          "type": "object",
          "description": "Dynamic template handlebars data"
        },
        "custom_args": {
          "type": "object",
          "additionalProperties": {
            "type": "string"
          }
        },
        "send_at": {
          "type": "integer"
        }
      }
    }
  }
}

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