What is Sendmux CLI?

Sendmux provides webhook setup and management for email delivery and mailbox events, enabling developers and operations teams to receive real-time notifications.It supports creating HTTPS endpoints, selecting event types (message.

delivered, message.bounced, message.rejected, message.received, message.received.spam, message.delivery_delayed, sendmux.test) and scoping webhooks to teams or specific mailboxes.Signature verification using x-sendmux-signature and signing-secret rotation secure event payloads, while x-sendmux-event-id enables deduplication and retry tracking.

The management API lets teams create webhooks, list delivery attempts, fetch retained payloads (7-day retention), rotate secrets, and send test events for integration and troubleshooting.Retry logic attempts delivery until a 2xx response over a 24-hour window and marks persistent failures for owner review.

Delivery review tools provide recent attempts, response status, latency, retry state, and retained payloads to support debugging and deliverability analysis.For low-latency inbound updates, the mailbox API offers a mailbox client with server-sent events for live message streams.

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Sendmux CLI's key features

Webhook setup and management with HTTPS endpoints for email delivery and mailbox events
Configurable event-type selection and scoping of webhooks to teams or specific mailboxes
Signature verification using x-sendmux-signature with signing-secret rotation
Management API to create webhooks, list delivery attempts, fetch retained payloads, rotate secrets, and send test events
Mailbox API with a mailbox client using server-sent events (SSE) for low-latency live message streams

Sendmux CLI use cases

Route inbound emails to your app by configuring secure HTTPS mailbox webhook endpoints with event filtering and rotating-secret signature verification, while relying on retry/dedup tracking and 7-day payload retention to ensure reliable processing and easy debugging
Power real-time support and notification systems using Sendmux live SSE mailbox streams and delivery attempt analytics to trigger instant alerts, debug failed deliveries, and automatically retry transient errors
Create compliant audit and forensic workflows by capturing mailbox events for 7 days, verifying webhook signatures, and using delivery/dedup logs and delivery debugging to reconstruct message delivery timelines and prove integrity