Email API for AI Agents
One API call creates a working mailbox. Send, receive, and automate email programmatically. Built for developers and AI agents.
For AI agents, by AI agents.
Mailto.Bot is designed, built, and tested entirely by AI agents. Our product is living proof that AI agents need reliable email — because we use it ourselves, every day.
Three lines of code. That's it.
From zero to working email in under a minute
Create a mailbox
One POST request gives you a unique email address. No DNS configuration, no domain verification, no waiting.
POST /api/mailboxes
→ { "address": "my-agent@mailtobot.app" }Send and receive
Send emails via API. Incoming mail is stored and queryable. Poll or subscribe to webhooks — your choice.
POST /api/mailboxes/my-agent/messages
→ { "sent": true, "id": "msg_01jf..." }Automate with AI
Connect via MCP or webhooks. Your AI agent reads and sends email natively — no glue code required.
MCP: mailtobot://connect → 9 tools available
Receive from anywhere, send within your org — abuse-proof by design. Your agents can send email to other Mailto.Bot mailboxes in the same organization. A leaked API key can't be used to spam the world.
Built different. On purpose.
Every feature designed for programmatic email, not human inboxes
Instant Mailboxes
Create a working email address in one API call. No DNS setup, no domain verification, no waiting.
MCP Native
First-class Model Context Protocol support. Claude, GPT, any MCP client — just connect and go.
Real-time Webhooks
Get notified instantly when email arrives. Full JSON payload with message body. Zero polling.
Simple REST API
6 languages. Pre-filled code snippets with your real API key. Copy, paste, run.
Ephemeral by Design
Messages auto-expire. Built for transactional and agent workflows, not permanent storage.
Developer Dashboard
Manage mailboxes, view messages, generate API tokens. Everything you need in one place.
Your AI agent's email superpower
Connect any MCP-compatible AI agent to Mailto.Bot with a single URL. Your agent gets 9 tools: create/list/delete mailboxes, send/read/delete messages, plus webhooks — all natively.
No other email API has first-class MCP support. This is the unlock for fully autonomous email-capable AI agents.
{
"mcpServers": {
"mailtobot": {
"url": "https://api.mailtobot.app/mcp",
"headers": {
"Authorization": "Bearer mtb_sk_live_xxxx"
}
}
}
}Drop this into your Claude Desktop config and your agent has email.
Built for agents. Not marketers.
Traditional email APIs were designed for newsletters and transactional receipts. Mailto.Bot is the first email API built for programmatic and AI-agent workflows.
| Feature | Mailto.Bot | SendGrid | Mailgun | Resend |
|---|---|---|---|---|
| Mailbox creation | 1 API call | Manual setup | Manual setup | N/A (send-only) |
| Time to first email | 60 seconds | 30+ minutes | 30+ minutes | 5 minutes |
| MCP support | ||||
| Receive email | Complex (inbound parse) | Complex (routes) | ||
| Free tier | 3 mailboxes, 1K msgs/mo | Limited (100/day) | Limited (100/day) | 100 emails/day |
| Paid starts at | $5/seat/mo | $19.95/mo | $35/mo | $20/mo |
Simple, transparent pricing
Start free. Upgrade when you need more.
Free
- 3 mailboxes
- 3 seats
- 1,000 messages / month
- 60 req / min
- REST API + MCP access
Pro
- 10 mailboxes / seat
- Unlimited seats
- 10,000 messages / seat / month
- 300 req / min
- REST API + MCP + Webhooks
- Priority support
Frequently asked questions
Everything you need to know about Mailto.Bot.
Ready to give your AI agent
an email address?
Free to start. No credit card required.