outlook-mcp

A Model Context Protocol (MCP) server for sending and managing Microsoft Outlook email via the Microsoft Graph API.

Features

• Send email — To, CC, BCC, plain text or HTML body, file attachments (max 3 MB each)

• Save draft — Save a message to Drafts without sending

• Update draft — Partially edit a saved Draft (only supplied fields change)

• Send draft — Transmit a saved Draft to its recipients

• List mail folders — Discover all folders including custom ones

• List messages — Browse any folder with full-text search or OData filter

• Get message — Read full message body (plain text or HTML) + attachment metadata

• Reply / Forward — Reply to or forward an existing message

• Mark message — Mark as read or unread

• Delete message — Move to Deleted Items (recoverable)

• List contact folders — Browse personal contact lists (folders) and their contacts

• List contacts — Search personal Outlook address book

• List M365 Group members — Find everyone in a Microsoft 365 Group

• List distribution groups — Find mail-enabled distribution lists in the organisation

• List users — Search or browse Azure AD users across the organisation

Related MCP server: Microsoft 365 MCP Server

Authentication

Uses OAuth 2.0 Device Code Flow — no browser redirect required. Tokens are stored locally at .access-token.txt and refreshed automatically.

auth_start  →  visit the URL, enter the code  →  auth_poll

Note: auth_start should only be called when another tool returns an authentication error. Do not call it proactively — all tools load the stored token automatically.

Setup

1. Install dependencies and build

npm install
npm run build

2. Register in Claude Code

Add to your project's .mcp.json:

{
  "mcpServers": {
    "outlook": {
      "type": "stdio",
      "command": "node",
      "args": ["C:\\Users\\staff\\Documents\\mcp\\outlook-mcp\\build\\index.js"]
    }
  }
}

3. Authenticate

Call auth_start once, follow the instructions, then call auth_poll to complete login.

Tools

Authentication

Sending & Drafts

Reading Mail

Mail Actions

Address Book & Directory

send_email / save_draft Parameters

Scopes

This MCP requests the following Microsoft Graph permissions:

• Mail.Send — Send email

• Mail.ReadWrite — Save drafts

• Group.Read.All — List group members and distribution groups

• GroupMember.Read.All — Read group membership

• Directory.Read.All — Browse the directory

• Contacts.Read — Read personal contacts

• User.Read.All — Search/list organisation users

• offline_access — Keep the session alive with a refresh token

Token Storage

Tokens are stored at outlook-mcp/.access-token.txt (excluded from git via .gitignore).

Attachment Limits

Attachments are encoded inline (base64). Files larger than 3 MB are rejected with a clear error before any API call is made. For larger files, share a link instead.