Sendmux CLI NEW

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.

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

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

Who is it for?

• Software developers
• Product engineers
• Operations teams
• Devops engineers
• Security engineers