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+# Cloudflare Email Workers
+
+Process incoming emails programmatically using Cloudflare Workers runtime.
+
+## Overview
+
+Email Workers enable custom email processing logic at the edge. Build spam filters, auto-responders, ticket systems, notification handlers, and more using the same Workers runtime you use for HTTP requests.
+
+**Key capabilities**:
+- Process inbound emails with full message access
+- Forward to verified destinations
+- Send replies with proper threading
+- Parse MIME content and attachments
+- Integrate with KV, R2, D1, and external APIs
+
+## Quick Start
+
+### Minimal ES Modules Handler
+
+```typescript
+export default {
+  async email(message, env, ctx) {
+    // Reject spam
+    if (message.from.includes('spam.com')) {
+      message.setReject('Blocked');
+      return;
+    }
+    
+    // Forward to inbox
+    await message.forward('inbox@example.com');
+  }
+};
+```
+
+### Core Operations
+
+| Operation | Method | Use Case |
+|-----------|--------|----------|
+| Forward | `message.forward(to, headers?)` | Route to verified destination |
+| Reject | `message.setReject(reason)` | Block with SMTP error |
+| Reply | `message.reply(emailMessage)` | Auto-respond with threading |
+| Parse | postal-mime library | Extract subject, body, attachments |
+
+## Reading Order
+
+For comprehensive understanding, read files in this order:
+
+1. **README.md** (this file) - Overview and quick start
+2. **configuration.md** - Setup, deployment, bindings
+3. **api.md** - Complete API reference
+4. **patterns.md** - Real-world implementation examples
+5. **gotchas.md** - Critical pitfalls and debugging
+
+## In This Reference
+
+| File | Description | Key Topics |
+|------|-------------|------------|
+| [api.md](./api.md) | Complete API reference | ForwardableEmailMessage, SendEmail bindings, reply() method, postal-mime/mimetext APIs |
+| [configuration.md](./configuration.md) | Setup and configuration | wrangler.jsonc, bindings, deployment, dependencies |
+| [patterns.md](./patterns.md) | Real-world examples | Allowlists from KV, auto-reply with threading, attachment extraction, webhook notifications |
+| [gotchas.md](./gotchas.md) | Pitfalls and debugging | Stream consumption, ctx.waitUntil errors, security, limits |
+
+## Architecture
+
+```
+Incoming Email → Email Routing → Email Worker
+                                    ↓
+                              Process + Decide
+                                    ↓
+                    ┌───────────────┼───────────────┐
+                    ↓               ↓               ↓
+                Forward          Reply          Reject
+```
+
+**Event flow**:
+1. Email arrives at your domain
+2. Email Routing matches route (e.g., `support@example.com`)
+3. Bound Email Worker receives `ForwardableEmailMessage`
+4. Worker processes and takes action (forward/reply/reject)
+5. Email delivered or rejected based on worker logic
+
+## Key Concepts
+
+### Envelope vs Headers
+
+- **Envelope addresses** (`message.from`, `message.to`): SMTP transport addresses (trusted)
+- **Header addresses** (parsed from body): Display addresses (can be spoofed)
+
+Use envelope addresses for security decisions.
+
+### Single-Use Streams
+
+`message.raw` is a ReadableStream that can only be read once. Buffer to ArrayBuffer for multiple uses.
+
+```typescript
+// Buffer first
+const buffer = await new Response(message.raw).arrayBuffer();
+const email = await PostalMime.parse(buffer);
+```
+
+See [gotchas.md](./gotchas.md#readablestream-can-only-be-consumed-once) for details.
+
+### Verified Destinations
+
+`forward()` only works with addresses verified in the Cloudflare Email Routing dashboard. Add destinations before deployment.
+
+## Use Cases
+
+- **Spam filtering**: Block based on sender, content, or reputation
+- **Auto-responders**: Send acknowledgment replies with threading
+- **Ticket creation**: Parse emails and create support tickets
+- **Email archival**: Store in KV, R2, or D1
+- **Notification routing**: Forward to Slack, Discord, or webhooks
+- **Attachment processing**: Extract files to R2 storage
+- **Multi-tenant routing**: Route based on recipient subdomain
+- **Size filtering**: Reject oversized attachments
+
+## Limits
+
+| Limit | Value |
+|-------|-------|
+| Max message size | 25 MiB |
+| Max routing rules | 200 |
+| Max destinations | 200 |
+| CPU time (free tier) | 10ms |
+| CPU time (paid tier) | 50ms |
+
+See [gotchas.md](./gotchas.md#limits-reference) for complete limits table.
+
+## Prerequisites
+
+Before deploying Email Workers:
+
+1. **Enable Email Routing** in Cloudflare dashboard for your domain
+2. **Verify destination addresses** for forwarding
+3. **Configure DMARC/SPF** for sending domains (required for replies)
+4. **Set up wrangler.jsonc** with SendEmail binding
+
+See [configuration.md](./configuration.md) for detailed setup.
+
+## Service Worker Syntax (Deprecated)
+
+Modern projects should use ES modules format shown above. Service Worker syntax (`addEventListener('email', ...)`) is deprecated but still supported.
+
+## See Also
+
+- [Email Routing Documentation](https://developers.cloudflare.com/email-routing/)
+- [Workers Platform](https://developers.cloudflare.com/workers/)
+- [Wrangler CLI](https://developers.cloudflare.com/workers/wrangler/)
+- [postal-mime on npm](https://www.npmjs.com/package/postal-mime)
+- [mimetext on npm](https://www.npmjs.com/package/mimetext)