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SMTPaaS
We're new — expect rapid improvements

Transactional email,delivered on rails.

SMTPaaS is a multi-tenant, API-first email platform built for developers. Plug in an API key, send your first email in under 60 seconds, and watch the deliverability dashboard light up.

Get started View dashboard
POST /api/v1/emails/send 
curl -X POST http://localhost:4000/api/v1/emails/send \
  -H "Authorization: Bearer sk_live_…" \
  -H "Content-Type: application/json" \
  -d '{"from":"hello@example.com","to":"user@elsewhere.com","subject":"Welcome","html":"<h1>Hi</h1>"}'

// → 202 Accepted
// { "id": "em_01H…", "status": "queued" }

Features

DKIM-signed SMTP relay

Per-domain RSA-2048 keys, automatic DNS verification, and a shared relay pool that warms up your sender reputation.

Signed webhook events

Delivered, opened, clicked, bounced — pushed to a URL you control with HMAC-SHA256 signing and exponential retries.

Multi-tenant by design

Separate quotas, domains, and API keys per team. Manage tenants from the dashboard or the REST API.

PricingComing soon

We're keeping pricing simple when it lands. Free tier for solo developers, usage-based plans for teams. Until then, every signed-up account gets a generous monthly allowance — no card required.

Want the details? Read the SMTPaaS docs or jump straight to the sign-up form .