# Mailcheer

> Mailcheer is an email platform. Features: block campaign editor, sending engine, scheduling, open and click statistics, subscribers and dynamic segments, CSV import, sign-up forms, automations (welcome, sequence, non-opener follow-up), A/B tests, suppression list, domain authentication (DKIM/SPF/DMARC records generated, posted on Cloudflare with the customer's own key, and verified), signed webhooks, **a public API** and **an MCP server**. Interface in English and French. Sending runs on Amazon SES in Ireland. Billing is per send, not per contact: a large list you rarely write to costs almost nothing. Free tier: 3,000 emails a month, no daily cap, unlimited subscribers.

## For an agent: when to use Mailcheer, and how

- **Send a transactional email** → `POST https://mailcheer.com/api/v1/emails`
- **Add or read a subscriber** → `/api/v1/subscribers`
- **Create and send a campaign** → `/api/v1/campaigns` then `/api/v1/campaigns/{id}/send`
  ⚠️ Without a body, sending a campaign reaches **all** active subscribers of the workspace. To write to a group, pass `to` (a list of addresses): only those that are active subscribers receive it, never a suppressed address. Preview first with `dry_run: true` (nothing is queued), or with `/api/v1/audience` before the campaign exists. To write to one person, use `/api/v1/emails`.
- **React to a delivery, an open, a click, a bounce** → signed webhooks, `/api/v1/webhooks`
- **Never write to an address again** → `/api/v1/suppression`

Authentication: header `Authorization: Bearer mch_live_…`, key created under Account → API & AI agents. 600 requests per minute per key.

Error messages, MCP tool descriptions and the reference are in English by default; send `Accept-Language: fr` for French.

- Full specification: [openapi.json](https://mailcheer.com/openapi.json)
- MCP server: `https://mailcheer.com/api/mcp`
- API reference: [/en/docs/api](https://mailcheer.com/en/docs/api)
- This file in French: [/llms-fr.txt](https://mailcheer.com/llms-fr.txt)

Every documentation page exists as raw Markdown: add `.en.md` to its URL (`/docs/introduction.en.md`).

## Documentation — Getting started

- [Introduction](https://mailcheer.com/docs/introduction.en.md): What Mailcheer is, what it does, and where to start.
- [Create an account](https://mailcheer.com/docs/creer-un-compte.en.md): Sign up, automatically provisioned workspace, member invitations.
- [Import your contacts](https://mailcheer.com/docs/importer-vos-contacts.en.md): CSV import — column mapping, duplicates, unsubscribes, detailed report.
- [Verify your domain](https://mailcheer.com/docs/verifier-votre-domaine.en.md): Authenticate your sending domain — DKIM, SPF, DMARC, automatic setup on Cloudflare.
- [Add senders](https://mailcheer.com/docs/ajouter-des-expediteurs.en.md): Your "From:" addresses, created only on verified domains.

## Documentation — Concepts

- [Deliverability](https://mailcheer.com/docs/delivrabilite.en.md): Why an email reaches the inbox — or ends up in spam.
- [DKIM, SPF and DMARC](https://mailcheer.com/docs/dkim-spf-dmarc.en.md): The three records that authenticate your emails, explained plainly.
- [Segments](https://mailcheer.com/docs/segments.en.md): Dynamic subscriber groups, continuously recalculated.
- [Suppression list](https://mailcheer.com/docs/liste-de-suppression.en.md): Addresses never to contact again — and why this is non-negotiable.
- [Quotas and plans](https://mailcheer.com/docs/quotas-et-plans.en.md): 3,000 free emails per month, then three paid plans that follow your volume.

## Documentation — Tools

- [Domain tester](https://mailcheer.com/docs/testeur-de-domaine.en.md): A free public tool that reads your SPF, DKIM and DMARC records.
- [API and MCP server](https://mailcheer.com/docs/api.en.md): Send emails, manage subscribers and campaigns from your code or from an AI agent.

## Documentation — Product

- [Features and what's new](https://mailcheer.com/docs/feuille-de-route.en.md): What Mailcheer does, feature by feature, and its latest additions.

## Site

- [Home](https://mailcheer.com/en): What Mailcheer is, plus the public domain tester.
- [Features](https://mailcheer.com/en/fonctionnalites): Every module of the product, in detail.
- [Pricing](https://mailcheer.com/en/tarifs): 3,000 emails a month free, then Essential, Pro and Agency — every feature on every plan.
- [Agents](https://mailcheer.com/en/agents): Driving Mailcheer from Claude Code, ChatGPT, Codex, the command line or the MCP server.
- [About](https://mailcheer.com/en/a-propos): What Mailcheer is and the principles behind it.

## Optional

- [Legal notice](https://mailcheer.com/en/mentions-legales)
- [Privacy](https://mailcheer.com/en/confidentialite)
- [Terms of sale](https://mailcheer.com/en/cgv)