# Warmbox

Self-hosted email warmup and deliverability engine for custom domains. Uses SMTP to send realistic B2B conversations and IMAP to rescue messages from spam folders, flag them as important, and reply — improving sender reputation over time.

## Tech Stack

- **Runtime:** Node.js + TypeScript + Express
- **Database:** SQLite via Prisma ORM
- **Email:** nodemailer (SMTP), imapflow (IMAP)
- **AI:** OpenRouter (free models) for conversation generation
- **Scheduler:** node-cron

## Quick Start

### 1. Install dependencies

```bash
npm install
```

### 2. Configure environment

```bash
cp .env.example .env
```

Generate an encryption key:

```bash
openssl rand -hex 32
```

Set these in `.env`:

| Variable         | Description                                                                 |
| ---------------- | --------------------------------------------------------------------------- |
| `DATABASE_URL`   | SQLite path, e.g. `file:./prisma/dev.db` (configured in `prisma.config.ts`) |
| `ENCRYPTION_KEY` | 64-char hex string (32 bytes) for AES-256-GCM password encryption           |
| `AI_API_KEY`     | API key from [OpenRouter](https://openrouter.ai/keys) (free tier works)     |
| `AI_BASE_URL`    | Default `https://openrouter.ai/api/v1`                                      |
| `AI_MODEL`       | Default `openrouter/free` (auto-picks a free model)                         |
| `API_KEY`        | Optional API key for REST auth (`x-api-key` header)                         |
| `PORT`           | HTTP port (default `3000`)                                                  |

### Get a free AI API key (OpenRouter)

Email generation only needs a small, fast language model — not GPT-4 class reasoning.

1. Sign up at [openrouter.ai](https://openrouter.ai/)
2. Go to [openrouter.ai/keys](https://openrouter.ai/keys) and create an API key
3. Paste it into `.env` as `AI_API_KEY`

**Recommended free models** (set `AI_MODEL` in `.env`):

| Model                                   | Notes                                          |
| --------------------------------------- | ---------------------------------------------- |
| `openrouter/free`                       | Auto-selects an available free model (default) |
| `google/gemma-2-9b-it:free`             | Good quality, reliable JSON                    |
| `meta-llama/llama-3.2-3b-instruct:free` | Fast, lightweight                              |

You do **not** need an OpenAI account.

### 3. Run database migrations

```bash
npm run db:migrate
```

### 4. Start the server

```bash
npm run dev
```

The API and cron jobs start together. Default schedules:

- **Dispatcher:** every 15 minutes — sends warmup emails
- **Rescuer:** every 10 minutes — rescues spam, replies to inbox
- **Ramp:** midnight daily — increases `currentRamp` per inbox

### 5. Add mailboxes

You need **at least 2 active inboxes** for warmup to work. Warmbox randomly pairs senders and receivers from your pool.

#### SMTP/IMAP settings by provider

Every inbox needs **4 connection fields** plus credentials:

| Field                   | What it is                                     |
| ----------------------- | ---------------------------------------------- |
| `smtpHost` / `smtpPort` | Where to **send** mail                         |
| `imapHost` / `imapPort` | Where to **read** mail (spam rescue + replies) |
| `username`              | Usually the full email address                 |
| `password`              | **App password** (not your login password)     |

##### Gmail (including Google Workspace custom domains)

If `hello@fillcareapp.com` is hosted on **Google Workspace**, use Gmail servers:

| Field      | Value            |
| ---------- | ---------------- |
| `smtpHost` | `smtp.gmail.com` |
| `smtpPort` | `587`            |
| `imapHost` | `imap.gmail.com` |
| `imapPort` | `993`            |

**App password setup:**

1. Enable 2-Step Verification on the Google account
2. Go to [myaccount.google.com/apppasswords](https://myaccount.google.com/apppasswords)
3. Create an app password for "Mail" → copy the 16-character code
4. Use that code as `password` in Warmbox

##### Yahoo Mail

| Field      | Value                 |
| ---------- | --------------------- |
| `smtpHost` | `smtp.mail.yahoo.com` |
| `smtpPort` | `587`                 |
| `imapHost` | `imap.mail.yahoo.com` |
| `imapPort` | `993`                 |

App password: [Yahoo Account Security](https://login.yahoo.com/account/security) → Generate app password.

##### Outlook / Hotmail / Live.com (@live.com, @outlook.com, @hotmail.com)

| Field      | Value                   |
| ---------- | ----------------------- |
| `smtpHost` | `smtp-mail.outlook.com` |
| `smtpPort` | `587`                   |
| `imapHost` | `outlook.office365.com` |
| `imapPort` | `993`                   |

App password: [Microsoft Account Security](https://account.microsoft.com/security) → Advanced security → App passwords. IMAP must be enabled in Outlook settings.

##### Custom domain (cPanel / generic hosting)

If `hello@fillcareapp.com` is on cPanel or similar (not Google/Microsoft), check your host's email docs. Common pattern:

| Field      | Value                                            |
| ---------- | ------------------------------------------------ |
| `smtpHost` | `mail.fillcareapp.com` or `smtp.fillcareapp.com` |
| `smtpPort` | `587` (or `465` for SSL)                         |
| `imapHost` | `mail.fillcareapp.com` or `imap.fillcareapp.com` |
| `imapPort` | `993`                                            |

Ask your DNS/hosting provider if unsure — look for "IMAP/SMTP settings" in cPanel → Email Accounts.

#### Example: FillCare + personal accounts

Add `hello@fillcareapp.com` as your primary warmup domain (industry: `Childcare`), then add 4–5 Gmail/Yahoo/Live accounts as the reply pool.

**1. Primary domain (FillCare)**

```bash
curl -X POST http://localhost:3000/api/inboxes \
  -H "Content-Type: application/json" \
  -d '{
    "email": "hello@fillcareapp.com",
    "smtpHost": "smtp.gmail.com",
    "smtpPort": 587,
    "imapHost": "imap.gmail.com",
    "imapPort": 993,
    "username": "hello@fillcareapp.com",
    "password": "hkem mfmi bkmg bqyw",
    "industry": "Childcare",
    "dailyLimit": 40,
    "currentRamp": 5
  }'
```

> If FillCare email is **not** on Google Workspace, swap `smtpHost`/`imapHost` to your host's values (see table above).

**2. Gmail account**

```bash
curl -X POST http://localhost:3000/api/inboxes \
  -H "Content-Type: application/json" \
  -d '{
    "email": "you@gmail.com",
    "smtpHost": "smtp.gmail.com",
    "smtpPort": 587,
    "imapHost": "imap.gmail.com",
    "imapPort": 993,
    "username": "you@gmail.com",
    "password": "your-gmail-app-password",
    "industry": "SaaS"
  }'
```

**3. Yahoo account**

```bash
curl -X POST http://localhost:3000/api/inboxes \
  -H "Content-Type: application/json" \
  -d '{
    "email": "you@yahoo.com",
    "smtpHost": "smtp.mail.yahoo.com",
    "smtpPort": 587,
    "imapHost": "imap.mail.yahoo.com",
    "imapPort": 993,
    "username": "you@yahoo.com",
    "password": "your-yahoo-app-password",
    "industry": "Marketing"
  }'
```

**4. Live.com / Outlook account**

```bash
curl -X POST http://localhost:3000/api/inboxes \
  -H "Content-Type: application/json" \
  -d '{
    "email": "you@live.com",
    "smtpHost": "smtp-mail.outlook.com",
    "smtpPort": 587,
    "imapHost": "outlook.office365.com",
    "imapPort": 993,
    "username": "you@live.com",
    "password": "your-microsoft-app-password",
    "industry": "Finance"
  }'
```

Repeat for each additional Gmail/Yahoo/Live account. Mixing providers is fine — Warmbox only needs them all in the same pool.

### 6. Test connections

After adding each inbox, verify SMTP + IMAP:

```bash
curl -X POST http://localhost:3000/api/inboxes/{id}/test
```

A successful response looks like:

```json
{
  "ok": true,
  "smtp": { "ok": true },
  "imap": { "ok": true }
}
```

If either fails, double-check the app password and that IMAP is enabled on the account.

### 7. Monitor logs

```bash
curl http://localhost:3000/api/logs
```

Watch for status progression: `sent` → `rescued_from_spam` → `replied` → `complete`.

## API Reference

All endpoints under `/api` accept optional `x-api-key` header when `API_KEY` is set.

| Method   | Path                    | Description                                         |
| -------- | ----------------------- | --------------------------------------------------- |
| `POST`   | `/api/inboxes`          | Create inbox                                        |
| `GET`    | `/api/inboxes`          | List inboxes                                        |
| `GET`    | `/api/inboxes/:id`      | Get inbox                                           |
| `PATCH`  | `/api/inboxes/:id`      | Update inbox                                        |
| `DELETE` | `/api/inboxes/:id`      | Delete inbox                                        |
| `POST`   | `/api/inboxes/:id/test` | Test SMTP + IMAP                                    |
| `GET`    | `/api/logs`             | List warmup logs (`?status=&inboxId=&page=&limit=`) |
| `GET`    | `/api/settings`         | Get settings                                        |
| `PATCH`  | `/api/settings`         | Update settings                                     |
| `GET`    | `/health`               | Health check                                        |

## Project Structure

```
src/
├── config.ts              # Environment validation
├── index.ts               # Express + scheduler bootstrap
├── jobs/
│   ├── dispatcher.job.ts  # Sends warmup emails
│   ├── rescuer.job.ts     # Spam rescue + replies
│   └── scheduler.ts       # Cron wiring
├── lib/                   # Prisma, logger, inbox guard
├── middleware/            # Auth, error handling
├── models/                # Enums, types
├── routes/                # REST endpoints
└── services/
    ├── ai.service.ts      # OpenRouter conversation generator
    ├── crypto.service.ts  # AES-256-GCM encryption
    ├── email.service.ts   # SMTP via nodemailer
    ├── imap.service.ts    # IMAP via imapflow
    └── settings.service.ts
prisma/
└── schema.prisma          # Database schema
```

## How It Works

1. **Dispatcher** picks random sender/receiver pairs from active inboxes, generates a B2B email via AI, and sends via SMTP.
2. **Rescuer** scans spam folders (`[Gmail]/Spam`, `Junk`, `Spam`) for warmup emails, moves them to INBOX, flags them as read/starred/important.
3. **Rescuer** also processes unread warmup emails already in INBOX, generates contextual AI replies, and sends them back.
4. Failed IMAP/SMTP connections mark the inbox as `error` and skip it until credentials are fixed.

## Production

```bash
npm run build
npm start
```

Use a process manager (systemd, PM2) and back up the SQLite database file regularly.

## License

MIT