Mailspring MCP Server Plugin

A Mailspring plugin that runs an MCP (Model Context Protocol) server, giving AI agents read-only access to your email data — threads, messages, contacts, folders, and labels.

The plugin uses Mailspring's own DatabaseStore API, making setup easy and seamless.

Installation

Use this if you want to install the plugin into Mailspring and run it normally.

1. Install dependencies and build the plugin:

npm install
npm run build

2. Install the built plugin into Mailspring through Mailspring's plugin install flow, or place the built plugin directory in Mailspring's packages directory.

3. Restart Mailspring. The MCP server starts automatically on http://127.0.0.1:2525/mcp.

MCP Configuration

Import the configuration using the following JSON snippet, example vscode snippet included in repo:

{
  "mcpServers": {
    "mailspring": {
      "url": "http://127.0.0.1:2525/mcp"
    }
  }
}

Development

Use this if you are actively working on the plugin code.

1. Install dependencies and build:

   npm install
   npm run build

2. Link the repo into Mailspring's packages directory so Mailspring loads your working copy:

./install.sh

3. Restart Mailspring.

Available Tools

Tool	Description
search_emails	Full-text search with structured filters (from, to, subject, date range, folder, label, unread, starred, attachments). Supports FTS5 syntax: OR, NOT, quoted phrases, prefix matching.
read_email	Read a specific email with full plain-text body content and attachment list
batch_read_emails	Read multiple emails at once by ID — full body + attachments for each
list_threads	List threads with filters (folder, label, unread, starred, date range, attachments). Returns enriched metadata: message count, last sender, reply status.
read_thread	Read a full thread with all messages, reply status, attachment details, sanitized bodyHtml, and stripped plain-text body
list_contacts	List or search contacts by name/email
list_folders	List all mailbox folders
list_labels	List all email labels
get_recent_emails	Get recent emails with date range filtering and pagination
list_drafts	List draft emails with pagination
email_stats	Get mailbox statistics