EmailBox MCP Server. Works over IMAP/SMTP Protocols

An MCP (Model Context Protocol) server that provides real email communication capabilities using IMAP for reading and SMTP for sending emails. Written with Go.

This is the MCP server to integrate email functionalities into MCP-compatible AI Agents and applications. It supports sending emails in text, markdown, and HTML formats, reading inbox messages, fetching full email contents including attachments, and receiving new email notifications via background polling.

The aim is to have a simple yet powerful email MCP server supporting notifications about new emails and full email content retrieval.

Features

• Send emails via SMTP with support for text, markdown, and HTML formats
• Read inbox via IMAP with filtering options
• Get full email contents including attachments
• New email notifications via background polling
• Dual transport: STDIO mode for local MCP clients, HTTP streaming for network deployments
• Contact list support via configuration
• Works with Gmail using App Password (no oAuth2 required)

Quick Start

1. Copy config.json.example to config.json and fill in your IMAP/SMTP credentials.
2. Build and run:

# STDIO server
cd stdio-server && go build -o mcp-email-stdio && ./mcp-email-stdio

# HTTP server
cd http-server && go build -o mcp-email-http && ./mcp-email-http

The config.json file must be in the same directory as the binary.

MCP Tools

Tool	Description
send_email	Send an email (to, subject, body, optional cc/bcc)
get_inbox	List inbox emails (optional limit, unread filter)
get_email_contents	Get full content of a specific email by ID
get_attachment	Download an email attachment as base64 by email ID and attachment index

Requirements

• Go 1.23+
• An email account with IMAP/SMTP access

License

This project is licensed under the CC BY-NC 4.0 License. See LICENSE for details.