Sendly Now Webhooks

generated: '2026-10-31'
method: searched
generator: extract-docs-artifacts.py (local)
source: https://docs.sendly.now/guides/webhooks
sources:
- https://docs.sendly.now/guides/webhooks
- https://docs.sendly.now/glossary/webhook
- https://docs.sendly.now/api-reference/webhooks/createWebhook
- https://docs.sendly.now/api-reference/webhooks/deleteWebhook
description: Sendly can send real‑time HTTP POSTs to your endpoint when specific events occur.
events:
- event: email.sent
  description: The message was handed to the sending infrastructure.
- event: email.delivered
  description: The recipient's server accepted it.
- event: email.opened
  description: The message was opened.
- event: email.clicked
  description: A link in the message was clicked.
- event: email.bounced
  description: The message hard‑bounced (a soft bounce does not fire this).
- event: email.complained
  description: The recipient marked it as spam.
- event: email.failed
  description: The send failed before or at handoff.
- event: contact.created
  description: A contact was created, by any route including an import.
- event: contact.unsubscribed
  description: A contact's status changed to unsubscribed.
- event: contacts.bulk_created
  description: A bulk import finished creating contacts.
delivery:
  signature: Each delivery includes two independent signatures – the X‑Sendly‑Signature header (legacy scheme) and the webhook‑signature header
    (Standard Webhooks) – both computed over the raw request body.
  content_type: application/json; charset=utf‑8 is sent in the Content‑Type header, and the X‑Sendly‑Event header contains the event name (e.g.
    email.sent). The X‑Sendly‑Timestamp header carries the Unix time in milliseconds, and the webhook‑signature header carries one or more space‑separated
    v1,<base64> signatures with a webhook‑id and webhook‑timestamp in seconds as part of the signed payload.
note: When a signature check fails, respond with a 5xx status so Sendly retries; a 4xx status is never retried and counts toward the 20‑failure
  auto‑disable limit. Retries are performed with a fresh timestamp and are signed again.
docs: https://docs.sendly.now/guides/webhooks