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Hamze Ghalebi
Hamze Ghalebi

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Open‑Source MCP Servers for Email and Calendar Management

Open-source Email servers that enable AI agents (using MCP) to handle common office tasks—particularly emails and calendars—without depending on commercial platforms like Google Workspace. Ideally, these servers should integrate with self-hosted platforms like Nextcloud and Mailcow, using standard protocols such as IMAP, SMTP, and CalDAV.

Recommended MCP Server Projects

📧 Email MCP Servers

1. AI ZeroLab MCP Email Server

  • Link: ai-zerolab/mcp-email-server

  • Main Features:

    • Supports multiple email accounts (IMAP/SMTP).
    • Send and receive emails, manage attachments, reply, and organise your inbox.
    • Provides a user-friendly web UI for easy configuration.

  • Tech Stack & Requirements:

    • Python 3 (easy to install via pip or Docker).
    • Any IMAP/SMTP email service (e.g., Mailcow, iRedMail, Gmail).

  • Setup & Integration:

    • Very user-friendly: install via a single command (pip install mcp-email-server) or Docker.
    • Has a simple web wizard for adding email accounts securely.
    • Integrates seamlessly with AI tools supporting MCP (like Claude Desktop or ChatGPT plugins).

2. IMAP MCP (by non-dirty)

  • Link: non-dirty/imap-mcp

  • Main Features:

    • Basic email management (read, compose, reply, mark emails, organise inboxes).
    • Designed specifically to help AI act as intelligent email assistants.

  • Tech Stack & Requirements:

    • Python-based, runs on a simple server environment.
    • Requires access to an IMAP email service (self-hosted or commercial).

  • Setup & Integration:

    • Slightly more manual setup (configuration via YAML files).
    • Well-documented with clear instructions on setup.
    • Compatible with AI tools that support MCP.

📅 Calendar MCP Servers

CalDAV MCP (by dominik1001)

  • Link: dominik1001/caldav-mcp

  • Main Features:

    • Access and manage calendars using the CalDAV standard (used by Nextcloud, Radicale, etc.).
    • Add new events and retrieve scheduled appointments.

  • Tech Stack & Requirements:

    • Built using Node.js/TypeScript; straightforward for modern JS environments.
    • Connects to any standard CalDAV server (such as Nextcloud’s built-in calendar).

  • Setup & Integration:

    • Easy installation via npm.
    • Requires minimal setup: mainly setting up a configuration file with server details.
    • Integrates directly into AI agents through standard MCP protocols.

Recommended Self-Hosted Backend Services (Alternative to Google Workspace)

To achieve a fully open-source and private alternative to Google Workspace, consider pairing these MCP servers with robust backend services:

  • Email:

    • Mailcow, iRedMail, or Modoboa for self-hosted email servers.
    • These are stable, feature-rich, and easy-to-maintain solutions providing standard IMAP and SMTP support, making them perfect for MCP integration.

  • Calendars & Contacts:

    • Nextcloud Hub (recommended), includes full-featured CalDAV calendars and CardDAV contact syncing.
    • SOGo as an alternative, especially integrated within Mailcow.

These services provide Google Workspace-level functionality completely within your control, offering privacy, security, and flexibility.

Summary

  • For Email MCP:

    • AI ZeroLab MCP Email Server offers the most polished user experience and easy setup. Ideal for quick, robust deployments.
    • IMAP MCP is more customisable and suits more technical setups requiring fine-grained control.

  • For Calendar MCP:

    • CalDAV MCP (by dominik1001) is simple, flexible, and integrates cleanly with your preferred open-source CalDAV server (e.g., Nextcloud).

  • Backend Infrastructure:

    • Combine Mailcow (email) and Nextcloud (calendar & contacts) to fully replace Google Workspace with self-hosted open-source infrastructure.

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