MCP server for the Lettr email API — send transactional emails, manage templates, domains, and webhooks from any AI assistant
Lettr MCP MCP server is a locally run integration for AI assistants that speak the Model Context Protocol. MCP server for the Lettr email API — send transactional emails, manage templates, domains, and webhooks from any AI assistant.
Lettr is a modern email sending platform built for developers. It offers a clean REST API, a powerful drag-and-drop template editor, merge tag personalization, open and click tracking, and best-in-class deliverability. Whether you're sending password resets, order confirmations, or onboarding sequences, Lettr makes it simple and reliable.
Installation goes through your MCP client rather than a global install: point it at lettr-mcp on npm and it is fetched when the client starts. The copy-paste blocks for Claude Desktop, Claude Code and Cursor are further down this page.
Once Lettr MCP is connected, these are the calls the assistant has available:
Cursor — Open the command palette and choose "Cursor Settings" > "MCP" > "Add new global MCP server"Options — The Options tool exposed by this serverEmails — The Emails tool exposed by this serverTemplates — The Templates tool exposed by this serverDomains — The Domains tool exposed by this serverWebhooks — The Webhooks tool exposed by this serverProjects — The Projects tool exposed by this serverAudience — The Audience tool exposed by this serverSystem — The System tool exposed by this serverYou will need one environment variable: LETTR_API_KEY. The server will not start without them, which is usually why the tools fail to appear on a first run. Keep credentials in your client's env block or a secrets manager rather than in a file you might commit.
This sits in the team communication group, where several servers overlap in what they claim to do but differ sharply once you actually set them up. Lettr MCP's toolset — Cursor, Options, Emails and 6 more — is a fair guide to whether it matches your workflow. It is maintained by lettr-com; worth a glance at recent repository activity before you build anything load-bearing on it.
This entry was verified against Lettr MCP's own documentation before publication; SyncDev keeps the directory reviewed rather than auto-generated.
| Tool | What it does |
|---|---|
| Cursor | Open the command palette and choose "Cursor Settings" > "MCP" > "Add new global MCP server". |
| Options | The Options tool exposed by this server. |
| Emails | The Emails tool exposed by this server. |
| Templates | The Templates tool exposed by this server. |
| Domains | The Domains tool exposed by this server. |
| Webhooks | The Webhooks tool exposed by this server. |
| Projects | The Projects tool exposed by this server. |
| Audience | The Audience tool exposed by this server. |
| System | The System tool exposed by this server. |
{
"mcpServers": {
"lettr": {
"command": "npx",
"args": ["-y", "lettr-mcp"],
"env": {
"LETTR_API_KEY": "your-value"
}
}
}
}Add to claude_desktop_config.json, then restart Claude Desktop.
| Variable | Description | Required |
|---|---|---|
| LETTR_API_KEY | Credential the server authenticates with. | Yes |
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Read and send Telegram messages through your assistant — chats, channels and history via the client API.
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