Programmable email inbox for AI agents — JMAP, PoW auth, stdio MCP server.
To add Atomic Mail to Claude, run the install command below or copy the ready-made config for Claude Code, Claude Desktop, Cursor and VS Code further down. Restart your client after adding it and its tools show up in your next conversation. It needs 5 environment variables, listed below.
Install
npx -y @atomicmail/mcp-modelcontextprotocol@0.3.27Environment variables
ATOMIC_MAIL_CREDENTIALS_DIRSet in your MCP configATOMIC_MAIL_API_KEYSet in your MCP configATOMIC_MAIL_AUTH_URLSet in your MCP configATOMIC_MAIL_API_URLSet in your MCP configATOMIC_MAIL_INBOX_DOMAINSet in your MCP configInstall with your client
claude mcp add atomic-mail --env ATOMIC_MAIL_CREDENTIALS_DIR=<YOUR_ATOMIC_MAIL_CREDENTIALS_DIR> --env ATOMIC_MAIL_API_KEY=<YOUR_ATOMIC_MAIL_API_KEY> --env ATOMIC_MAIL_AUTH_URL=<YOUR_ATOMIC_MAIL_AUTH_URL> --env ATOMIC_MAIL_API_URL=<YOUR_ATOMIC_MAIL_API_URL> --env ATOMIC_MAIL_INBOX_DOMAIN=<YOUR_ATOMIC_MAIL_INBOX_DOMAIN> -- npx -y @atomicmail/mcp-modelcontextprotocol@0.3.27
Run this in a terminal to add the server to Claude Code.
What this does
Atomic Mail exposes a set of tools to Claude over the Model Context Protocol. After you add it to claude_desktop_config.json (snippet above) and restart Claude Desktop, those tools become callable inside any conversation.
Requirements
This server needs the following environment variables to be set before it can run:
ATOMIC_MAIL_CREDENTIALS_DIR ATOMIC_MAIL_API_KEY ATOMIC_MAIL_AUTH_URL ATOMIC_MAIL_API_URL ATOMIC_MAIL_INBOX_DOMAIN
Set these via the env object in your MCP config (see claude_desktop_config.json snippet above).
Frequently asked questions
How do I install Atomic Mail?
Run the Claude Code command in the install section to add Atomic Mail to Claude Code, or copy the ready-made config for your client from the install section on this page. Restart your client afterwards and the tools appear in your next conversation.
Which clients work with Atomic Mail?
This page carries setup and config for Claude Code, Claude Desktop, Cursor and VS Code. Any other MCP client that accepts a standard server config can connect to Atomic Mail as well.
Does Atomic Mail need an API key?
Yes. Before it can run, set these environment variables: ATOMIC_MAIL_CREDENTIALS_DIR, ATOMIC_MAIL_API_KEY, ATOMIC_MAIL_AUTH_URL, ATOMIC_MAIL_API_URL, ATOMIC_MAIL_INBOX_DOMAIN. They go in the env block of your MCP config.
Imported from the Official MCP Registry. The details above come from the registry entry; the maker can claim this listing to correct them, add docs, and see its traffic.
Is this your MCP server?
Claim this listing to see its traffic, fix details yourself, and skip the review queue on future updates.
Add this badge to your README
Show visitors this server is listed in the ClaudeRules directory. The badge links straight to this listing.
[](https://clauderules.net/mcp/io-github-atomic-mail-mcp)<a href="https://clauderules.net/mcp/io-github-atomic-mail-mcp" target="_blank" rel="noopener noreferrer"><img src="https://clauderules.net/api/badge/io-github-atomic-mail-mcp" alt="Listed on clauderules.net" /></a>More AI MCP servers
Awesome MCP Servers by punkpeye
A curated, community-maintained list of Model Context Protocol (MCP) servers, organized by category, with sections for MCP clients, tutorials, and community resources. The repository is a directory of production-ready and experimental servers that extend AI capabilities through file access, database connections, and API integrations; it is a list, not a runnable MCP server itself.
GitHub
Connect AI assistants to GitHub - manage repos, issues, PRs, and workflows through natural language.
FastMCP
🐍 - A high-level framework for building MCP servers in Python
Serena MCP: the IDE for your agent
A powerful toolkit for coding, providing semantic retrieval and editing capabilities.