POST /messaging/v1/email/messages/

Overview

Sends a message to multiple recipients using a send definition. You can provide a messageKey in the request; otherwise, the messageKey is automatically generated in the response. The limit is 2000 recipients per request. If you send attributes with the recipients, we recommend no more than 500 recipients per request.

JSON Parameters

NameTypeDescription
definitionKeystringRequiredUnique identifier of the definition.
recipientsarrayRequiredArray of recipient objects that contain parameters and metadata for the recipients, such as send tracking and personalization attributes. Use this parameter to send to multiple recipients in one request. Use either the recipient or recipients parameter, but not both.
recipients.contactKeystringRequiredUnique identifier for a subscriber in Marketing Cloud. Each request must include a contactKey. You can use an existing subscriber key or create one at send time by using the recipient’s email address.
recipients.tostringChannel address of the recipient. For email, it’s the recipient's email address.
recipients.messageKeystringUnique identifier used to track message status. Can be automatically created when you create a message or provided as part of the request. Can be up to 100 characters, and there are no restricted characters. Each recipient in a request must have a unique messageKey. If you use a duplicate messageKey in the same send request, the message is rejected.
recipients.attributesobjectInformation used to personalize the message for the recipient. Written as key pairs. The attributes match profile attributes, content attributes, or triggered send data extension attributes.
attributesobjectInformation used to personalize the message for the request. Written as key pairs. The attributes match profile attributes, content attributes, or triggered send data extension attributes.

Usage

Example Request

Example Response

Example Response: Mixed Responses

HTTP Responses

ResponseReason
202 AcceptedRequest is accepted. Review example response.
400 Bad RequestInvalid request
403 ForbiddenFailed to pass authorization.
500 Server ErrorInternal error