Create a batch of email messages
Accepts up to 100 independent email messages and queues them for delivery. All items are validated before any are queued: if one fails validation, the entire batch is rejected. Field-level validation failures and business-rule failures, such as sending from a domain that is not verified, both return 422. An item can set scheduled_at to send it later, on the same terms as a single scheduled send, and one batch can mix scheduled and immediate messages. Cancel a scheduled item before it sends with Cancel an email message. Suppression is evaluated per recipient after acceptance, never as a synchronous error. The 202 response returns one entry per message in submission order, each with its own id you can use to fetch that message or match it against webhook events. Attachments are allowed per message. Each message must stay within the 20 MB estimated generated message-size cap, and the serialized JSON request body for the whole batch has a hard 20 MB cap.
Request
- Base URL: https://us1.platform.bird.com
- URL: https://us1.platform.bird.com/v1/email/batches
- Auth: one of:
- HTTP bearer
- API key in cookie bird_session
Headers
Client-supplied key. On operations supporting request deduplication, a retained response is replayed for duplicate requests with the same key within the idempotency window (3 hours by default). This protection requires a workspace, organization, or staff-account scope. User-only and unscoped unauthenticated operations, streams, and operations with a separate replay contract do not use this response replay.
On a supported operation, if idempotency protection is unavailable before execution, the API returns 503 IdempotencyUnavailable (E01033) without executing this attempt. Retry with backoff using the same key and request. An operation that takes effect before its response is retained can still execute again on retry.
Two distinct 409 errors signal misuse:
- request_in_progress (E01004): The same key is currently being processed by a concurrent request. Wait briefly and retry. The lock expires within 30 seconds.
- idempotency_key_reuse (E01005): The same key has already completed against a different request body or method. Generate a new key.
Recommended key format is <event-type>/<entity-id> (for example welcome-user/usr_abc123).
Workspace context for the request. Required for dashboard authentication and master keys. Workspace keys and access tokens already identify their workspace; send that workspace or omit the header. A different one is rejected.
Organization context for the request. Required for dashboard authentication. An API key or access token carries its own organization, so send either that organization or no header at all; a different one is rejected.
Request body
Example request
{
"messages": [
{
"from": {
"email": "noreply@acme.com",
"name": "Acme Support"
},
"to": [
{
"email": "delivered@messagebird.dev",
"name": "Jane Doe"
}
],
"subject": "Your receipt for order #1234",
"text": "Thanks for your purchase! Your receipt is attached."
},
{
"from": {
"email": "noreply@acme.com",
"name": "Acme Support"
},
"to": [
{
"email": "delivered@messagebird.dev",
"name": "John Roe"
}
],
"subject": "Your receipt for order #1235",
"text": "Thanks for your purchase! Your receipt is attached."
}
]
}Response
Batch accepted for asynchronous delivery.
Example response
{
"data": [
{
"id": "em_01krdgeqcxet5s7t44vh8rt9mg",
"requested_language": "pt-BR",
"resolved_language": "pt-BR",
"template_id": "emt_01krdgeqcxet5s7t44vh8rt9mg",
"template_version_id": "emv_01krdgeqcxet5s7t44vh8rt9mg"
}
]
}Changes
No recorded changes to this operation across all 2 revisions of this API.