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Claude Email Connector

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Claude Email Connector (MCP Server)

A stateless remote MCP server that lets Claude send email from a Microsoft mailbox via Microsoft Graph /me/sendMail.

Microsoft Entra is the OAuth authorization server. When a user connects this connector in Claude, Claude runs OAuth against Entra and sends the resulting delegated Graph access token as a bearer token on every tool call. This server stores no tokens and has no refresh logic — it relays the bearer token straight to Graph.

Tools

  • preview_email — formats a draft for review. Sends nothing.

  • send_email — sends via the authenticated user's mailbox, but only if confirmed: true. Two separate tools by design (no auto-send).

  • get_email_count — total/unread count for a folder (inbox default; use all for the whole mailbox). Read-only.

  • list_recent_emails — most recent messages in a folder (subject, sender, date, read state, preview). Read-only.

  • search_emails — search the mailbox by keyword/sender. Read-only.

Required Graph permissions (delegated)

  • Mail.Send — preview_email / send_email

  • Mail.Read — get_email_count / list_recent_emails / search_emails

Add these under the Entra app registration → API permissions, and reconnect the connector in Claude so the new scopes are consented.

Endpoints

  • GET /.well-known/oauth-protected-resource — OAuth Protected Resource Metadata (RFC 9728). Points Claude at this server as the auth server.

  • GET /.well-known/oauth-authorization-server (and /openid-configuration) — OAuth Authorization Server Metadata (RFC 8414). Advertises the proxy endpoints.

  • GET /authorize / POST /token — OAuth proxy to Microsoft Entra.

  • POST /mcp — MCP Streamable HTTP endpoint (stateless). Requires Authorization: Bearer <token>; returns 401 + WWW-Authenticate otherwise.

Why the OAuth proxy?

Claude (like all MCP clients) includes the RFC 8707 resource parameter in the OAuth authorize/token requests. Entra's v2.0 endpoint rejects resource outright (AADSTS901002 / AADSTS9010010). So this server advertises itself as the authorization server, strips the resource parameter, and forwards the requests to Entra. It remains stateless — /authorize is a 302 redirect and /token is a transparent form forward; no tokens or secrets are stored.

Run locally

npm install
# set PUBLIC_URL to your public HTTPS URL, then:
node server.js

Deploy (free tier)

  1. Push this repo to your host (Render / Railway / Fly.io / etc.).

  2. Set environment variables on the host:

    • PUBLIC_URL = the app's public HTTPS URL, e.g. https://your-app.onrender.com (no trailing slash).

    • PORT is usually injected by the host automatically; the server honors it.

  3. Start command: node server.js

  4. Verify https://<your-app>/.well-known/oauth-protected-resource returns raw JSON.

Connect in Claude

claude.ai → Settings → Connectors → Add custom connector:

  • URL: https://<your-app>/mcp

  • Advanced settings: paste your Entra Application (client) ID and client secret value. These live in Claude only — never in this server.

Security

Client ID/secret are never stored in this server or repo. .env is gitignored. The server only ever relays the per-request bearer token to Graph.