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Inbox OSS

Use case · Transactional

Receipts, password resets, alerts — delivered in seconds.

Transactional email is a product feature. We make sure it works every time, with the latency and observability your users expect.

Sub-second p50

From your /mail/send call to your customer's inbox in under a second, most of the time.

Critical-mail priority lane

Tag a message critical and it skips ahead of marketing campaigns in the queue.

Idempotency keys

Safe retries on network failures. No duplicate password resets, ever.

SDK + SMTP

Use whichever your stack prefers. Same deliverability, same observability.

Automatic retries

Soft bounces and temporary failures retried with exponential backoff. Hard bounces suppressed instantly.

Per-message tracing

Every message has a trace ID. Follow it from accept → DKIM → MX → delivery in one view.

Make transactional email a feature, not a worry.

Free plan includes 3,000 emails/month forever. No credit card required.