# An inbox for every agent.

Source: https://corespeed.io/email

Agent Mail is part of CoreSpeed: the `mail__*` tools come with its MCP server, so any connected agent can use them, with no API key and no SDK.

Get started: https://app.corespeed.io/sign-up · Docs: https://corespeed.io/docs/mail

## Two kinds of inbox. Plus every agent

- **Disposable** — For sign-ups and codes. Receive-only. Gone within 7 days.
- **Persistent** — Sends, replies and forwards. Lives until you delete it.
- **Any agent** — Claude Code, Codex, Cursor, OpenClaw, Hermes. No API key. No SDK.

## Your agent keeps the conversation going

- **Read** — The whole thread, in clean text.
- **Reply** — In the thread. To one, or to all.
- **Forward** — The attachments come along.
- **Search** — Every inbox it can see, at once.

## Mail goes out on your say-so

How sending works: https://corespeed.io/docs/mail#first-messages-to-new-people-need-a-person

- **You approve first contact.** — An agent's first message to anyone outside your team comes to you as an approval card.
- **Hardened against prompt injection.** — Every message is labeled untrusted before your agent reads it.
- **Limits keep the address clean.** — Caps per hour and per day. Sending pauses itself if too much mail bounces.

The first message from an agent's inbox to:

| Recipient | First message |
| --- | --- |
| A teammate | Sends |
| An address on your allowlist | Sends |
| Someone it wrote to before | Sends |
| Someone new | Needs approval |
| Someone who wrote in first | Needs approval |

## Real email. Made for agents

The parts of an inbox an agent uses, and a few only an agent needs.

### Read

- Clean text, not raw HTML.
- Links sorted: verify, log in, reset.
- Waits up to 50 seconds for new mail.

Learn more: https://corespeed.io/docs/mail#reading

### Send

- Attach from Drive or a public URL.
- Check recipients before you send.
- Retry with a key. It never sends twice.

Learn more: https://corespeed.io/docs/mail#sending

### Keep

- Attachments saved to your Drive.
- Share an inbox with your team.
- Take mail only from senders you list.

Learn more: https://corespeed.io/docs/mail#inboxes

## Pay for the mail. Not for a plan

- **5 credits** — A disposable inbox, once
- **300 credits** — A persistent inbox, per 30 days
- **1 credit** — Per recipient you send to
- **Free** — Receiving, reading, searching, waiting

Deleting an inbox stops its charge. A failed or refused call is never charged. https://corespeed.io/pricing (Markdown: https://corespeed.io/pricing.md)

## Questions people ask

### What address does my agent get?

One on mail0.app, like support-t9bqz3@mail0.app. The first part comes from the inbox's name; the random part makes it hard to guess. A deleted address is never given out again.

### Can I use my own domain?

Not yet. Every inbox is on mail0.app.

### Who can read an agent's inbox?

The agent that made it, and the people in your organization. Share it, and every agent in your organization can use it too. Nobody outside your organization can.

### Why did my agent's message wait for approval?

Mail to someone new outside your organization always needs a person's approval, whatever your approval rules say. That includes the first reply to someone who wrote in, because a From line can be forged. Teammates, your allowlist and people the inbox already wrote to need no approval. How approvals work: https://corespeed.io/docs/approvals

### Is incoming mail safe to act on?

Treat it as data. Every message comes marked untrusted, with a notice that tells the agent so, and that sender names and addresses are not verified.

## Links

- Product overview: https://corespeed.io/ (Markdown: https://corespeed.io/index.md)
- Mail docs: https://corespeed.io/docs/mail (Markdown: https://corespeed.io/docs/mail.md)
- Pricing: https://corespeed.io/pricing (Markdown: https://corespeed.io/pricing.md)