If you've ever wanted your AI assistant to actually send messages instead of just drafting them, this is the server to install. It wraps Slack Web API, Telegram Client API, SMTP (Gmail, Naver, custom), Microsoft Graph, KakaoTalk REST, and Discord webhooks behind a single send_message tool. The LLM doesn't need to know which channel uses what protocol. Built in C# with the official MCP SDK, it handles OAuth token refresh for Microsoft and KakaoTalk, stores credentials in user-scoped files, and supports MCP elicitation for secrets. Particularly strong for Korean users who need KakaoTalk support, which no other MCP server currently offers.