What format is required for the instance host?

Provide the full hostname without the 'https://' prefix, for example: `box.yourdomain.com`.

Can I add multiple forwarding targets to an alias?

Yes, when using the `create_or_update_alias` tool, provide a comma-separated list of emails in the `forwards_to` field.

Does this work with 2FA enabled accounts?

The current API implementation uses Basic Auth. If 2FA is enabled on your admin account, you may need to use an API key or a dedicated admin user without 2FA for the integration.

Mail-in-a-Box MCP Server for Cursor 9 tools — connect in under 2 minutes

Name: Mail-in-a-Box
Availability: InStock
Author: Vinkius

docs.cursor.com/context/model-context-protocol

Built by Vinkius GDPR 9 Tools IDE

Cursor is an AI-first code editor built on VS Code that integrates LLM-powered coding assistance directly into the development workflow. Its Agent mode enables autonomous multi-step coding tasks, and MCP support lets agents access external data sources and APIs during code generation.

Get MCP Server for AI Agents

ASK AI ABOUT THIS MCP SERVER

Open in ChatGPT Open in Claude Open in Perplexity

Vinkius supports streamable HTTP and SSE.

RecommendedModern Approach — Zero Configuration

Vinkius Desktop App

The modern way to manage MCP Servers — no config files, no terminal commands. Install Mail-in-a-Box and 2,500+ MCP Servers from a single visual interface.

Download Free Open SourceNo signup required

Classic Setup·json

{
  "mcpServers": {
    "mail-in-a-box": {
      "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
    }
  }
}

Fully ManagedVinkius Servers

60%Token savings

High SecurityEnterprise-grade

IAMAccess control

EU AI ActCompliant

DLPData protection

V8 IsolateSandboxed

Ed25519Audit chain

<40msKill switch

Stream every event to Splunk, Datadog, or your own webhook in real-time

* Every MCP server runs on Vinkius-managed infrastructure inside AWS - a purpose-built runtime with per-request V8 isolates, Ed25519 signed audit chains, and sub-40ms cold starts optimized for native MCP execution. See our infrastructure

About Mail-in-a-Box MCP Server

Connect your Mail-in-a-Box instance to any AI agent to automate your private email server management. This MCP server enables your agent to manage mailboxes, configure forwarding aliases, and monitor system health and diagnostics directly from natural language interfaces.

Cursor's Agent mode turns Mail-in-a-Box into an in-editor superpower. Ask Cursor to generate code using live data from Mail-in-a-Box and it fetches, processes, and writes. all in a single agentic loop. 9 tools appear alongside file editing and terminal access, creating a unified development environment grounded in real-time information.

What you can do

User Administration — List all mail users, create new mailboxes, and update passwords programmatically
Alias Management — Create, update, and remove email forwarding addresses and group aliases
System Monitoring — Retrieve real-time health status, diagnostic checks, and configuration metadata for your server
Domain Oversight — List all hosted mail domains and subdomains configured on your instance
Access Control — Manage administrative privileges and account settings for your email users

The Mail-in-a-Box MCP Server exposes 9 tools through the Vinkius. Connect it to Cursor in under two minutes — no API keys to rotate, no infrastructure to provision, no vendor lock-in. Your configuration, your data, your control.

How to Connect Mail-in-a-Box to Cursor via MCP

Follow these steps to integrate the Mail-in-a-Box MCP Server with Cursor.

Open MCP Settings

Press Cmd+Shift+P (macOS) or Ctrl+Shift+P (Windows/Linux) → search "MCP Settings"

Add the server config

Paste the JSON configuration above into the mcp.json file that opens

Save the file

Cursor will automatically detect the new MCP server

Start using Mail-in-a-Box

Open Agent mode in chat and ask: "Using Mail-in-a-Box, help me...". 9 tools available

Why Use Cursor with the Mail-in-a-Box MCP Server

Cursor AI Code Editor provides unique advantages when paired with Mail-in-a-Box through the Model Context Protocol.

Agent mode turns Cursor into an autonomous coding assistant that can read files, run commands, and call MCP tools without switching context

Cursor's Composer feature can generate entire files using real-time data fetched through MCP. no copy-pasting from external dashboards

MCP tools appear alongside built-in tools like file reading and terminal access, creating a unified agentic environment

VS Code extension compatibility means your existing workflow, keybindings, and extensions all work alongside MCP tools

Mail-in-a-Box + Cursor Use Cases

Practical scenarios where Cursor combined with the Mail-in-a-Box MCP Server delivers measurable value.

Code generation with live data: ask Cursor to generate a security report module using live DNS and subdomain data fetched through MCP

Automated documentation: have Cursor query your API's tool schemas and generate TypeScript interfaces or OpenAPI specs automatically

Infrastructure-as-code: Cursor can fetch domain configurations and generate corresponding Terraform or CloudFormation templates

Test scaffolding: ask Cursor to pull real API responses via MCP and generate unit test fixtures from actual data

Mail-in-a-Box MCP Tools for Cursor (9)

These 9 tools become available when you connect Mail-in-a-Box to Cursor via MCP:

create_mail_user

Requires a full email address and a password. Add a new mail user (mailbox)

create_or_update_alias

forwards_to should be a comma-separated list of emails. Add or update a mail alias

delete_mail_alias

Remove a mail alias

delete_mail_user

Remove a mail user

get_system_status

Check the status of the Mail-in-a-Box system

list_mail_aliases

List all mail aliases and forwarders

list_mail_domains

List all mail domains hosted on the server

list_mail_users

List all mail users on the server

update_user_password

Change the password for a mail user

Example Prompts for Mail-in-a-Box in Cursor

Ready-to-use prompts you can give your Cursor agent to start working with Mail-in-a-Box immediately.

"List all mail users on my server."

"Create a new mail user 'support@example.com' with password 'MySecret123!'."

"How is the health status of my Mail-in-a-Box server?"

Troubleshooting Mail-in-a-Box MCP Server with Cursor

Common issues when connecting Mail-in-a-Box to Cursor through the Vinkius, and how to resolve them.

Tools not appearing in Cursor

Ensure you are in Agent mode (not Ask mode). MCP tools only work in Agent mode.

Server shows as disconnected

Check Settings → Features → MCP and verify the server status. Try clicking the refresh button.

Mail-in-a-Box + Cursor FAQ

Common questions about integrating Mail-in-a-Box MCP Server with Cursor.

What is Agent mode and why does it matter for MCP?

Agent mode is Cursor's autonomous execution mode where the AI can perform multi-step tasks: reading files, editing code, running terminal commands, and calling MCP tools. Without Agent mode, Cursor operates in a simpler ask-and-answer mode that doesn't support tool calling. Always ensure you're in Agent mode when working with MCP servers.

Where does Cursor store MCP configuration?

Cursor looks for MCP server configurations in a mcp.json file. You can configure servers at the project level (.cursor/mcp.json in your project root) or globally (~/.cursor/mcp.json). Project-level configs take precedence.

Can Cursor use MCP tools in inline edits?

No. MCP tools are only available in Agent mode through the chat panel. Inline completions and Tab suggestions do not trigger MCP tool calls. This is by design. tool calls require user visibility and approval.

How do I verify MCP tools are loaded?

Open Settings → Features → MCP and look for your server name. A green indicator means the server is connected. You can also check Agent mode's available tools by clicking the tools dropdown in the chat panel.