# bax - Email API for AI Agents

> bax is a modern email API and mailbox infrastructure built for AI agents, automation, and developer teams. It provides REST APIs, SDKs (TypeScript, Python, Go), real-time webhooks, and a team inbox UI.

## What is bax?

bax is an email platform that lets you send and receive emails programmatically. Unlike Gmail API (complex OAuth, rate limits) or Resend (send-only), bax provides full bidirectional email with an API-first approach.

## Key Features

- **REST API**: Create mailboxes, send/receive emails, manage attachments via simple HTTP endpoints
- **Real-time Webhooks**: Instant HTTP POST when emails arrive - no IMAP polling
- **SDKs**: Official TypeScript/Node.js, Python, and Go SDKs
- **Custom Domains**: Use your own domain (support@yourdomain.com) with auto-configured DKIM, SPF, DMARC
- **AI Analysis**: Built-in email categorization and entity extraction
- **Team Inbox UI**: Web interface for viewing and managing emails when needed
- **Disposable Inboxes**: Create temporary email addresses on-demand for testing

## Use Cases

- AI customer support agents that receive and reply to tickets
- Email automation and workflow processing
- E2E testing with real email verification
- Webhook-driven email processing pipelines
- Sales automation with inbound lead handling
- Multi-agent systems with dedicated mailboxes

## Pricing

- **Free**: 1 mailbox on bax.email, send/receive, API access, webhooks, AI analysis
- **Pro**: $9/month per custom domain + $2/month per mailbox account

## URLs

- Website: https://bax.email
- App: https://app.bax.email
- API Base: https://api.bax.email
- Documentation: https://bax.email/docs

## API Quick Start

```bash
# Create a mailbox
curl -X POST https://api.bax.email/api/v1/mailboxes \
  -H "Authorization: Bearer YOUR_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"username": "support"}'

# Send an email
curl -X POST https://api.bax.email/api/v1/emails \
  -H "Authorization: Bearer YOUR_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "mailbox_id": "MAILBOX_ID",
    "to": ["recipient@example.com"],
    "subject": "Hello from bax",
    "body": "Sent via bax email API"
  }'

# List emails in a mailbox
curl https://api.bax.email/api/v1/mailboxes/MAILBOX_ID/emails \
  -H "Authorization: Bearer YOUR_TOKEN"
```

## Comparison with Alternatives

| Feature | bax | Gmail API | Resend | SendGrid |
|---------|-----|-----------|--------|----------|
| Send emails | Yes | Yes | Yes | Yes |
| Receive emails | Yes | Yes | No | Limited |
| Webhooks | Yes | Push notifications | Webhooks (send only) | Limited inbound |
| Custom domains | $9/mo | Google Workspace required | Yes | Yes |
| SDK | TS, Python, Go | Google client libs | TS, Python | Multiple |
| OAuth required | No (API key) | Yes ($15K-$75K audit) | No | No |
| AI analysis | Built-in | No | No | No |
| Inbox UI | Yes | Gmail UI | No | No |

## Articles

- [Agent Mailbox: Why Every AI Agent Needs Its Own Email](https://bax.email/articles/agent-mailbox)
- [The Best Email API for AI: What to Look For in 2026](https://bax.email/articles/best-email-api-for-ai)
- [Custom Domain Email for Developers](https://bax.email/articles/custom-domain-email-for-developers)
- [Disposable Email API](https://bax.email/articles/disposable-email-api)
- [Email Webhooks: Complete Guide](https://bax.email/articles/email-webhooks-guide)
- [Why Gmail is Not for AI-First Teams](https://bax.email/articles/why-gmail-is-not-for-ai-first-teams)
- [Why Resend Falls Short for AI-First Teams](https://bax.email/articles/why-resend-falls-short-for-ai-first-teams)