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Email Fast is in early access: the platform is feature-complete for it, and live sending opens as outbound infrastructure comes online. Two ways in, both real today.
1 — Try it now with a sandbox key
sandbox keys (ef_sandbox_…) that run the real pipeline dry: real validation, real rendering, real events, a hosted capture inbox — and no email leaves.
The sandbox is not a mock. Your requests hit the same admission gate, the same renderer, the same event stream as production — the only difference is that nothing leaves. It's the honest way to evaluate an email platform before a single real message is at stake.
Email hello@emailfast.dev with the subject sandbox key and one line about what you're building. Keys are issued manually during early access — typically within a day. When self-serve signup opens, this page becomes the signup form.
# Everything in the docs works with your sandbox key:
curl https://api.emailfast.dev/v1/emails \
-H "Authorization: Bearer ef_sandbox_..." \
-d '{ "to": "test@example.com", "subject": "Hello", "html": "<p>Hi!</p>" }'
# → 202, a full event timeline, and the message in your hosted capture inbox2 — Apply for early access
Live sending opens in stages as outbound infrastructure arms. Early-access teams get onboarded first, with hands-on help from the people who built the platform — including migration from your current provider.
Early access runs as a small, hand-onboarded cohort, and every application is read by a person. The application takes a few minutes. Apply for early access →
What you can evaluate today
- The full REST API against a sandbox key — admission, idempotency, templates, events
- The browser SDK and the SendGrid/Mailgun/Postmark compatibility endpoints
- The documentation — including the markdown mirrors and llms.txt your coding agent will use
- The security architecture, in the open
What opens at launch
- Live delivery on our own infrastructure, with delivered messages can mint an Ed25519-signed delivery certificate — receiving mail server, TLS details, the server's SMTP response, and timestamps, with the recipient stored only as a keyed hash — chained into a tamper-evident ledger and verifiable without trusting us.
- Self-serve signup and the free tier — which never expires
- Newsletter hosting: public archives, RSS, signup forms, paid subscriptions