Cancel a scheduled outbound message

Endpoint

POST https://api.dairo.app/v1/messages/{messageId}/cancel

Cancels a scheduled outbound send before it fires, by messageId. This succeeds only while the message is still in scheduled status; the response is the message with status: canceled and a canceledAt timestamp. If the send has already left scheduled — sent, queued, canceled, or unknown — the call returns 409. Cancellation stops only the future dispatch and emits no webhook event. Requires the messages:send scope.

Scope: messages:send. Send the API key as a bearer token; Scopes lists what each one reaches.

Request

cURL

curl -X POST "https://api.dairo.app/v1/messages/3fa85f64-5717-4562-b3fc-2c963f66afa6/cancel" \
  -H "Authorization: Bearer $DAIRO_API_KEY"

Path parameters

Name	Type	Required	Description
`messageId`	string	yes	The outbound email id to cancel.

Response

200 Success. Body: application/json, CancelOutboundMessageResponse.

Field	Type	Required	Description
`message`	OutboundMessage	yes

200

{
  "message": {
    "id": "string",
    "from": null,
    "to": [
      "string"
    ],
    "subject": "Hello from Acme",
    "status": null,
    "sentAt": null,
    "error": null,
    "providerMessageId": "3fa85f64-5717-4562-b3fc-2c963f66afa6",
    "lastEventType": null,
    "lastEventAt": null,
    "bouncedAt": null,
    "complainedAt": null,
    "createdAt": null,
    "scheduledAt": "2026-10-19T09:30:00Z",
    "canceledAt": "2026-10-19T09:30:00Z"
  }
}

Errors

Every error has the same body, {"error": {"type", "code", "message", "param"}}; branch on code. Errors lists every code.

Status	Meaning
`400`	The request is malformed or a value is invalid (`invalid_request`, `invalid_domain`, `idempotency_key_mismatch`).
`401`	The API key is missing or invalid.
`403`	The key lacks the scope this endpoint needs (`scope_missing`) or may not do this (`not_permitted`).
`404`	No such resource in this account (`resource_not_found`).
`409`	The resource already exists or its state does not allow this (`duplicate_resource` or a condition-specific code).
`422`	The request is well-formed but a field failed validation (`validation_failed`).
`429`	Rate limit, plan limit, budget or spend cap reached (`rate_limited`, `plan_limit_reached`, `budget_exceeded`, `spend_cap_reached`).
`500`	An unexpected error; retry with backoff, then contact support (`internal_error`).

Cancel a scheduled outbound message

Request

Path parameters

Response

Errors

On this page