Custom webhook events
Updated Apr 8, 2026 · 4 min read
Subscribe any tool to InboxLee mailbox lifecycle events.
On this page · 4
- Available events
- Configuring
- Verifying signatures
- Retry policy
InboxLee POSTs JSON payloads to a URL you configure when mailbox-lifecycle events happen. Use this to wire any tool - Slack, PagerDuty, your billing system, an internal CRM.
Available events
Configuring
In InboxLee → Settings → Webhooks → Create. Provide a URL, select events, choose a signing secret. InboxLee signs every payload with HMAC-SHA256.
Verifying signatures
X-InboxLee-Signature: sha256=<hmac-hex> X-InboxLee-Timestamp: <unix-seconds>
Reject any payload where the timestamp is more than 5 minutes old, or the signature does not match HMAC-SHA256(secret, timestamp + "." + body).
Retry policy
On 4xx/5xx response, InboxLee retries with exponential backoff up to 24 hours, then drops the event. The dashboard surfaces failed deliveries so you can investigate.