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Send email from your AI assistant with Lettr

Lettr works with AI assistants through a hosted MCP server at app.lettr.com/mcp.

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Read the setup guide

What you can do

  • Connect Claude, Claude Code, ChatGPT, Cursor or GitHub Copilot
  • Send and schedule email in plain language
  • Manage templates, domains, webhooks, campaigns and your audience
  • Look into bounces and delivery problems

How to set it up

  1. 1 In Claude, open Customize, then Connectors, click + and choose Add custom connector.
  2. 2 Enter Lettr as the name and https://app.lettr.com/mcp as the server URL, then click Add.
  3. 3 Click Connect and sign in to Lettr in the window that opens.
  4. 4 Start a new conversation and ask about your sending domains or recent bounces.

In Claude Code, add the server from your terminal, then run /mcp and choose Authenticate.

claude mcp add --transport http lettr https://app.lettr.com/mcp

Requirements

  • A Lettr account with a verified sending domain
  • An AI assistant that supports MCP

Links

Questions

Do I need an API key to connect?
No. The server signs you in to Lettr with OAuth. For CI jobs and headless agents it also accepts a Lettr API key in an Authorization header.

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