Communication Servers

Provides a bridge between Microsoft 365 services and natural language interfaces, enabling access to email, calendar, OneDrive files, and Excel operations through the Microsoft Graph API with simplified authentication and parameter handling.

Slack

Experience the most powerful MCP server for Slack workspaces with advanced message and channel support. This feature-rich server allows fetching messages from channels, threads, DMs, and group DMs with embedded user info and smart history pagination by date or count. It supports enterprise workspaces, caching for faster access, and flexible transports like Stdio and SSE with proxy settings. Designed for stealth operation or secure access via OAuth, it integrates channel and thread lookups by name or ID to give rich, contextual Slack workspace data efficiently and reliably. Perfect for developers needing robust Slack data handling.

Provides IMAP/SMTP email access for reading messages and sending emails with secure connection support and environment-based credential management.

Bridges AI with Telegram to enable monitoring, organizing, and responding to messages through account access, dialog management, and conversation handling capabilities

Manage your emails effortlessly with a standardized interface for drafting, sending, retrieving, and organizing messages. Streamline your email workflow with complete Gmail API coverage, including label and thread management.

Enables sending customizable messages to external webhook endpoints, facilitating automated notifications and workflow integrations.

Provides multi-channel notification capabilities through desktop notifications, email via SMTP, and HTTP API endpoints with a single tool that simultaneously delivers alerts across all configured channels.

Integrates with Asterisk phone systems to enable outbound call operations, conversation monitoring, call history retrieval, and telephony system metrics tracking for business automation workflows.

Feishu/Lark

Official

Integrates with Feishu/Lark's collaboration suite, enabling AI assistants to interact with productivity tools through the official Node.js SDK.

Integrates with Microsoft Teams through Graph API to search messages, manage chats and channels, send messages, create group chats, and handle user/team operations with device code authentication for secure access.

Integrates with Discord through Discord.js to provide comprehensive bot capabilities including message management, channel operations, forum posts, reactions, webhooks, and server administration with automatic reconnection and rate limiting protection.

Mailtrap Email API

Official

Enables sending transactional emails through the Mailtrap Email API.

Integrates with RetellAI's voice services for creating and managing phone conversations, enabling call initiation, agent configuration, and voice selection for tasks like customer service, appointment scheduling, and information gathering.

Enables sending push notifications through the ntfy service with customizable titles, summaries, priority levels, and tags for alerting users about completed tasks or status updates.

Enables AI to compose and send emails through the Resend API with customizable sender addresses, reply-to fields, and scheduled delivery options

Sinch

Official

Integrates with Sinch's communication APIs to send messages across SMS, WhatsApp, RCS, and email channels, manage voice calls and conferences, and perform phone number verification and lookup operations with multi-region support and webhook event tracking.

Integrates WeCom (WeChat Work) bot functionality for enterprise messaging, notifications, and interactive chatbots.

Integrates with email providers to enable sending and receiving emails, automating workflows and managing communications via IMAP and SMTP functionality.

Enables reading and sending Instagram direct messages through a Python server that authenticates with Instagram cookies and provides tools for retrieving recent conversations and sending new messages.

Enables Claude and other assistants to send SMS and MMS messages through Twilio's API with phone number validation and specialized prompts for greetings and haikus.

Integrates Gmail functionality, enabling email search, message retrieval, and attachment downloads via Google Apps Script.