Transactional Email, Simplified

Send password resets, notifications, and receipts through one API. Bring your own provider - Resend, SendGrid, or Amazon SES - with no volume caps. Sandbox mode captures every email for inspection; flip to live when you're ready.

Get Started with FastFlowTech

Multi-Provider

Send through Resend, SendGrid, or Amazon SES. Bring your own provider account - we don't cap your volume.

Delivery Tracking

Real-time delivery, bounce, and complaint status via provider webhooks. Know exactly what happened to every email.

Automatic Retry

Failed emails retry automatically with exponential backoff - 1 min, 5 min, 30 min, then 2 hours. No manual intervention needed.

Template Preview

Preview your email templates with sample data before sending. See exactly how variables render in the final email.

Sandbox Mode

Every email captured and viewable in the activity feed. Preview HTML, inspect headers, trace events - no emails actually sent.

No Volume Cap

You bring your own provider, so there are no sending limits on our side. Send 100 or 100,000 emails - your provider is the only limit.

Multi-Tenant

Isolated servers per app or environment. Each server gets its own API keys, templates, and activity feed.

Templates

Create reusable email templates with {{variable}} placeholders. Send by alias with a model.

Activity Feed & Stats

Full delivery timeline for every message. Filter by server, status, or tag. Track daily volume and delivery rates.

How It Works

Create a Server

Each app or environment gets its own server. Starts in sandbox mode - every email is captured for inspection.

Send via API

Generate an API key and POST /v1/email/send with your X-Server-Token header.

Go Live

When ready, switch to live mode and configure Resend, SendGrid, or Amazon SES. Same API, real delivery.

Quick Start

terminal

curl -X POST https://mail.fastflow.tech/v1/email/send \
  -H "Content-Type: application/json" \
  -H "X-Server-Token: ffm_your_api_key" \
  -d '{
    "from": "[email protected]",
    "to": "[email protected]",
    "subject": "Welcome!",
    "htmlBody": "<h1>Hello!</h1><p>Welcome aboard.</p>"
  }'

Ready to send your first email?

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