sendmux-ai · AsyncAPI Specification

Sendmux Ai Webhooks

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AsyncAPI Specification

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generated: '2026-10-31'
method: searched
generator: extract-docs-artifacts.py (local)
source: https://sendmux.ai/docs/webhooks/setup
sources:
- https://sendmux.ai/docs/webhooks/setup
- https://sendmux.ai/docs/webhooks/verify-signatures
- https://sendmux.ai/docs/webhooks/setup
- https://sendmux.ai/docs/webhooks/verify-signatures
description: Sendmux webhooks POST events to your HTTPS endpoint when mail is delivered, rejected, bounced, complained about, or received by a
  mailbox.
events:
- event: message.delivered
  description: A recipient system accepted the message.
- event: message.bounced
  description: A message bounced.
- event: message.complained
  description: A recipient marked a message as spam.
- event: message.rejected
  description: The sending system rejected the message before delivery.
- event: message.delivery_delayed
  description: Delivery is delayed and still being retried.
- event: message.received
  description: A mailbox received an inbound message.
- event: message.received.spam
  description: A mailbox received an inbound message classified as spam.
- event: sendmux.test
  description: A synthetic event for testing a webhook.
delivery:
  signature: X-Sendmux-Signature-V2
  retries: Non‑2xx responses and timeouts are retried across a 24‑hour window.
note: Each delivery also includes X-Sendmux-Timestamp, X-Sendmux-Event-Id, X-Sendmux-Event-Type, and X-Sendmux-Delivery-Attempt headers.
docs: https://sendmux.ai/docs/webhooks/setup

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