Role · Developers

An email platform that respects your tooling

OpenAPI 3.1 spec, SDKs in 8 languages, CLI for local dev, OSS source available. We optimize for not surprising you.

Node, Python, Go, Ruby, PHP, Java, .NET, Rust — all generated from the same OpenAPI spec.

inbox CLI for local dev: send test emails, tail event logs, inspect templates.

Idempotency keys on every write. Webhook retries with exponential backoff for 24h.

Inbox OSS is, well, open source. Self-host or use our cloud. Same code path.

Sandbox mode validates every request without spending a credit. Perfect for CI.

Ed25519 signatures. Public key rotates with notice. Replay window enforced server-side.

Start sending email in under 5 minutes.

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