Open-source alternatives to Modoboa

This Model Context Protocol (MCP) server provides a bridge between LLMs and Google Tasks, allowing you to manage your task lists and tasks directly through Claude.

A MCP (Model Context Protocol) server that provides get, send Gmails without local credential or token setup.

A wiki system with complex functionality for simple integration and a superb interface. Store your knowledge with style: Use django models.

Helios server

Reference client for Bitmessage: a P2P encrypted decentralised communication protocol:

Social reading and reviewing, decentralized with ActivityPub

Telegram MCP for managing dialogs, messages, drafts, read statuses, and more.

Telegram MCP server powered by Telethon to let MCP clients read chats, manage groups, and send/modify messages, media, contacts, and settings.

Cypht: Lightweight Open Source webmail aggregator PHP, JS. Supports IMAP/SMTP, JMAP and EWS (Exchange Web Services)

DebOps - Your Debian-based data center in a box

Askbot is a Django/Python Q&A forum. Contributors README: https://github.com/ASKBOT/askbot-devel#how-to-contribute. Commercial hosting of Askbot and support are available at https://askbot.com

This project provides a full-stack, containerized mail server platform designed for self-hosting. It functions as a complete mail transfer agent that bundles essential services—including SMTP, IMAP, and POP3—into a unified environment. By leveraging container orchestration, it enables the deployment of private email infrastructure that handles message transport, delivery, and user management within a single, manageable service. The platform distinguishes itself through deep integration with container runtimes and robust configuration flexibility. It supports granular customization via configu

Inbox Zero is an AI-powered email automation platform and inbox organizer. It uses large language models to automatically categorize, label, and archive emails, while providing a conversational interface for managing workflows and drafting responses through natural language. The project distinguishes itself by integrating real-time calendar availability into its drafting process and generating AI-summarized meeting briefings. It supports a pluggable AI provider interface with model fallback chains, allowing it to connect to various cloud or local LLM providers. Users can also control their in

Maddy is a modular mail server that assembles a complete email system by connecting small, single-purpose modules through a declarative configuration file. Rather than a monolithic stack, it lets operators compose message processing, storage, authentication, and security enforcement from interchangeable building blocks, with each module handling a specific function like receiving SMTP connections, verifying credentials, or applying policy checks. The server distinguishes itself through its flexible authentication and security architecture. It delegates user verification to external systems in

SecureDrop is an integrated software suite designed for anonymous whistleblowing and encrypted document leaks. It provides a platform for the secure transfer of sensitive files and a communication portal for two-way encrypted messaging between organizations and anonymous sources. The system ensures identity protection by integrating onion routing to mask network locations and using asymmetric cryptography for secure communication. It incorporates a metadata-stripping pipeline to remove identifying information from uploaded files before they are reviewed. For data handling, the platform utili

GlobaLeaks is a free and open-source whistleblowing software enabling anyone to easily set up and maintain a secure reporting platform.

A Model Context Protocol (MCP) server for Gmail integration in Claude Desktop with auto authentication support. This server enables AI assistants to manage Gmail through natural language interactions.

gotoHuman makes it easy to add human approvals to AI agents and agentic workflows. A fully-managed async human-in-the-loop workflow with a customizable approval UI. Enjoy built-in auth, webhooks, notifications, team features, and an evolving training dataset.

An MCP server application that sends various types of messages to the WeCom group robot.

An MCP server that provides safe access to your iMessage database through Model Context Protocol (MCP). This server is built with the FastMCP framework and the imessagedb library, enabling LLMs to query and analyze iMessage conversations with proper phone number validation and attachment handling.

The AgentMail Toolkit integrates popular agent frameworks and protocols including OpenAI Agents SDK, Vercel AI SDK, and Model Context Protocol (MCP) with the AgentMail API.

Indico - A feature-rich event management system, made @ CERN, the place where the Web was born.

An MCP (Model Context Protocol) server implementation for Microsoft Teams integration, providing capabilities to read messages, create messages, reply to messages, mention members.

Full-featured, open source mail server solution for mainstream Linux/BSD distributions.

Abilian Social Business Engine - an enterprise social networking / collaboration platform.