Mailbridge

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

Tool	Description
check_connection	Test connection and show inbox stats
read_emails	Fetch emails from any folder (includes priority + category)
get_email_body	Get full body of an email by UID
get_emails_with_preview	Fetch emails with body snippets — used for inbox summaries
search_emails	Search by keyword, sender, or subject
list_folders	List all mailbox folders
get_thread	Fetch the full conversation thread for an email
get_contact_history	All emails to/from a specific contact
unified_inbox	Merge multiple folders into one sorted view
export_email	Export an email as clean Markdown
extract_calendar_events	Extract event details and parse .ics attachments

Attachments

Tool	Description
get_attachments	List attachments with safety scan — no download
read_attachment	Download and read an attachment after user approves

Sending & Drafts

Tool	Description
send_email	Compose and send a new email (optional file attachments)
reply_to_email	Reply to an existing email (optional file attachments)
save_draft	Save an email as a local draft
list_drafts	List saved drafts
send_draft	Send a saved draft by ID
delete_draft	Discard a saved draft
schedule_email	Schedule an email for future delivery
list_scheduled	List pending scheduled emails
cancel_scheduled	Cancel a scheduled email
check_email_opens	Scan the inbox for read-receipt confirmations and report opens
list_tracked_emails	Show tracked emails and their open status (no inbox scan)

Organisation

Tool	Description
mark_as_read	Mark email as read
mark_as_unread	Mark email as unread
move_email	Move email to another folder
delete_email	Move email to Trash
bulk_mark_read	Mark multiple emails as read
bulk_mark_unread	Mark multiple emails as unread
bulk_move	Move multiple emails to a folder
bulk_delete	Move multiple emails to Trash
set_reminder	Set a follow-up reminder on an email
list_reminders	View active reminders (overdue ones flagged)
complete_reminder	Mark a reminder as done
unsubscribe_email	Auto-unsubscribe via List-Unsubscribe header

Rules

Tool	Description
add_rule	Add a local rule to flag, categorise, or prioritise emails
list_rules	List all configured rules
remove_rule	Remove a rule by name
apply_rules	Dry-run rules against a set of emails

Accounts

Tool	Description
list_accounts	Show all connected accounts
switch_account	Switch active account
add_account	Add a new account via chat
remove_account	Remove an account (defaults to active)
remove_all_accounts	Disconnect and remove all accounts
open_setup	Open the setup portal to connect or add an account

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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:

Safety	Meaning
✅ Safe	Known safe file type, extension matches MIME type
⚠️ Warning	Unrecognised extension or MIME mismatch — will not auto-download
🚫 Blocked	Executable or script file — refused outright (.exe, .bat, .ps1, .sh, .jar, etc.)

Supported file types:

Type	What happens
PDF	Text extracted and displayed
DOCX	Text extracted and displayed
TXT, CSV, MD	Displayed as plain text
JPG, PNG, GIF, WebP	Displayed inline — the AI can see and describe the image
MP3, MP4, WAV, M4A	Saved to temp path — pass to a transcription plugin

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Supported Providers

Provider	IMAP	SMTP
iCloud	imap.mail.me.com:993	smtp.mail.me.com:587
Custom IMAP	Your mail server	Your mail server

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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