Mailbridge MCP Server

Mailbridge MCP

Connect your AI assistant to your email — read, search, send, reply, organise, draft, schedule, and manage attachments from iCloud or any IMAP account. Works with Claude, OpenAI Codex, Cursor, Windsurf, and any MCP-compatible client.

Credentials are stored securely in your OS credential store (macOS Keychain, Windows Credential Manager, or Linux Keyring) — never in a file.

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Features

Reading & Search

• Read emails — fetch inbox, any folder, with subject/sender/date
• Inbox digest — smart summary with priority scoring, categories, and action suggestions
• Search — find emails by keyword, sender, or subject
• Thread view — see the full conversation thread for any email
• Contact history — view all emails to/from a specific contact
• Unified inbox — merge multiple folders into one date-sorted view
• Priority scoring — every email is automatically scored 1–5 for urgency
• Auto-categorisation — emails are tagged Finance, Travel, Calendar, Newsletter, and more

Sending & Drafts

• Send & reply — compose new emails or reply with threading
• Send attachments — attach local files or inline content to any outgoing email
• Smart drafts — save emails locally for review before sending
• Email scheduling — schedule emails to send at a future time
• Read receipts — optionally request confirmation when a sent email is opened (recipient-dependent; see Read Receipts)

Organisation

• Bulk actions — mark, move, or delete multiple emails in one command
• Follow-up reminders — tag an email "remind me in 3 days" and it surfaces in your next digest
• Unsubscribe — auto-unsubscribe from mailing lists via List-Unsubscribe headers
• Email rules — define local rules to flag, categorise, or prioritise emails automatically
• Move, delete, mark — standard inbox management tools

Attachments & Content

• Read attachments — PDF, DOCX, TXT, JPG, PNG, MP3, MP4 and more
• Attachment safety — every attachment is scanned before download; dangerous file types are blocked
• Export email — export any email as clean Markdown
• Calendar extraction — pull event details (dates, times, locations) from emails and .ics files

Accounts

• Multiple accounts — connect and switch between accounts
• Secure credentials — passwords stored in OS keychain, never in plain text

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Install

Claude Cowork

1. Go to Customize → Connectors → Browse Plugins → "+" sign
2. Add marketplace source: https://github.com/Creativestefan/mailbridge-mcp
3. Start a new chat — and enter Open Mailbridge setup to open the setup portal and connect your email account
4. For iCloud emails you will need to create an App specfic password to access your email securely. Using your real password will fail to authenicate.
5. To reopen setup at any time: "open Mailbridge setup"

To update later: Customize → Connectors → Browse Plugins → (...) button and Click Check for update

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OpenAI Codex

1. Add the Mailbridge marketplace:

codex plugin marketplace add Creativestefan/mailbridge-mcp --ref main

1. Install the plugin:

codex plugin add mailbridge@mailbridge

1. Start a new Codex thread and test:

Use Mailbridge to check my email connection.

1. If no account is connected yet:

Type "Open Mailbridge setup" and send.

The setup portal saves credentials directly to your OS credential store (macOS Keychain, Windows Credential Manager, or Linux Keyring).

To update later:

codex plugin marketplace upgrade
codex plugin add mailbridge@mailbridge

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Cursor

1. Open Cursor Settings → Tools & MCP
2. Click Add MCP Server and paste:

{
  "mcpServers": {
    "mailbridge": {
      "command": "npx",
      "args": ["-y", "mailbridge-mcp@latest"]
    }
  }
}

1. Fully quit and reopen Cursor (MCP servers only load at startup)
2. Start a new chat and test:

Use Mailbridge to check my email connection.

If no account is connected yet, the setup portal opens automatically — or ask: "open email setup".

To update later: bump the version tag in your config to mailbridge-mcp@latest — it always pulls the newest release.

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Via npm (any MCP client)

Add to your MCP client config (e.g. claude_desktop_config.json):

{
  "mcpServers": {
    "mailbridge": {
      "command": "npx",
      "args": ["mailbridge-mcp"]
    }
  }
}

On first start, if no account is configured, the setup portal opens automatically in your browser. Fill in your email details — credentials are saved directly to your OS credential store and the portal closes. You only need to do this once.

To reopen setup at any time, ask your assistant: "open email setup"

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Setup

On first install, a browser form opens automatically to connect your email account. Credentials go directly into your OS credential store on submit — nothing is written to a file.

To reopen setup at any time, just ask your assistant: "open email setup".

iCloud

You must use an App-Specific Password — your main Apple ID password will not work.

Go to account.apple.com → Sign-In & Security → App-Specific Passwords → +, name it "Mailbridge", and use the generated password.

Custom IMAP account

Use your full email address and password. The mail server is usually mail.yourdomain.com — check your email provider's settings if unsure.

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Tools

Reading

Attachments

Sending & Drafts

Organisation

Rules

Accounts

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Inbox Summary

Ask your assistant "catch me up" or "what did I miss?" for a structured digest.

Every email now carries automatic priority scoring (1–5) and category tags so the digest is sorted instantly:

• 🔴 Action Required — priority 4–5 or keywords like "urgent", "deadline", "reply needed"
• 💰 Finance & Billing — invoices, payments, subscription renewals
• 📅 Events & Calendar — meeting invites, travel confirmations, RSVPs
• 📦 Updates & FYI — newsletters, notifications, low-priority

Follow-up reminders due today or overdue are surfaced at the top of every digest.

The digest closes with a suggested actions block — specific next steps like "unsubscribe from X", "set a reminder on Y", or "bulk archive the 8 newsletters".

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Drafts & Scheduling

Save any email as a draft before sending:

"Draft a reply to this email — I'll review it first"

Schedule an email for later:

"Send this to john@example.com tomorrow at 9am"

Scheduled emails fire automatically on the next session start after the scheduled time.

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Read Receipts

Ask Mailbridge to track when a sent email is opened:

"Send this to john@example.com and let me know when he opens it"

This sets request_receipt: true, which adds standard read-receipt headers (RFC 8098 / MDN) to the message. Later:

"Did John open my email?"

runs check_email_opens, which scans your inbox for the recipient's confirmation and reports who opened it and when.

How it actually works — and its limits:

• Mailbridge uses read-receipt headers, not tracking pixels. Nothing phones home to any server; the recipient's mail app asks them to confirm, and the confirmation comes back as a normal email that Mailbridge reads locally.
• A receipt only arrives if the recipient's client supports read receipts and the recipient agrees to send one. Apple Mail and Thunderbird prompt for this; Gmail's web app ignores it.
• No receipt does not mean the email was unread. An "awaiting" status simply means no confirmation has come back — it is not proof of anything.
• This is intentionally the privacy-respecting approach: no invisible pixels, no third-party trackers, no data leaving your device.

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Email Rules

Define local rules that apply automatically during inbox summaries:

"Flag all emails from boss@company.com as urgent" "Categorise anything from billing@stripe.com as Finance" "Set priority 5 on emails with 'invoice due' in the subject"

Rules are stored locally — they work without any server-side filtering.

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Attachments

Mailbridge scans every attachment before downloading:

Supported file types:

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Supported Providers

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Security

• Passwords are stored exclusively in the OS credential store — never written to any file
• The setup portal is a one-time browser form — it starts, collects your credentials, saves them to your OS keychain, then shuts down automatically
• All IMAP and SMTP connections use SSL/TLS
• Attachments are scanned before download — executables and scripts are always blocked
• No data is sent to any Mailbridge server — everything runs locally on your device

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License

MIT — see LICENSE

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Legal

• Privacy Policy
• Terms of Use