generated: '2026-08-26'
method: searched
source: https://docs.paubox.com/email-api/webhooks
description: >-
  Paubox publishes a delivery-event webhook surface for the Email API but NO AsyncAPI
  document. Events are documented in prose and tables only, so this artifact captures the
  webhook catalog rather than a spec. Searched for an AsyncAPI at /asyncapi.yaml and
  /asyncapi.json on every host and in the provider's own llms.txt index — none is
  published, and none is referenced anywhere in the documentation.
asyncapi_published: false
asyncapi_probed:
  - url: https://docs.paubox.com/llms.txt
    status: 200
    note: >-
      Provider's own documentation index. Lists three OpenAPI specs under an "OpenAPI
      Specs" heading and no AsyncAPI.
type: webhooks
docs: https://docs.paubox.com/email-api/webhooks
configuration_url: https://next.paubox.com/emailapi/webhooks
api: Paubox Email API

delivery:
  transport: HTTPS POST to a consumer-owned URL
  scope: organization
  scope_warning: >-
    Webhooks fire at the ORGANIZATION level, not per domain. Every domain in the
    organization sends events to the one configured URL, with no per-domain filtering.
    Consumers must inspect the payload's `from` field to route by domain.
  content_type: application/json

events:
  - name: Delivered
    key: api_mail_log_delivered
    trigger: Message is delivered.
  - name: Temporary Failure
    key: api_mail_log_temporary_failure
    trigger: Soft bounce.
  - name: Permanent Failure
    key: api_mail_log_permanent_failure
    trigger: Hard bounce.
  - name: Opened
    key: api_mail_log_opened
    trigger: Message is opened.
event_count: 4

payload:
  envelope:
    event_name: string — one of the event keys above
    payload: object — shape depends on the model that triggered the event
  common_shape: API Mail Log
  fields:
    id: integer
    subject: string
    header_message_id: string
    source_tracking_id: string — the same handle returned by sendMessage
    outbound_queue_id: string
    time: ISO 8601 timestamp with milliseconds
    from: string
    to: string
    custom_headers: object — arbitrary custom headers set on the original message

reliability:
  signature_verification: false
  signature_note: >-
    Provider states verbatim that webhook signature verification is not currently
    supported, and recommends network-level controls instead — IP allowlisting or a shared
    secret embedded in the URL path. A consumer therefore cannot cryptographically
    establish that a payload came from Paubox.
  retries: false
  retry_note: >-
    Provider states verbatim that Paubox does not currently retry failed webhook
    deliveries. If the endpoint is unavailable when an event fires, that notification is
    lost permanently.
  recommended_fallback: >-
    Poll getMessageReceipt (GET /message_receipt) with the sourceTrackingId when
    guaranteed delivery tracking is required.

gaps:
  - No AsyncAPI or other machine-readable event contract.
  - No signature or HMAC verification.
  - No retry, no dead-letter, no replay.
  - No per-domain event filtering.
  - No webhook events published for the Marketing API or the Forms API.