"Open source MCP (Model Context Protocol) implementations" matching MCP servers:

Enables ChatGPT to search, read, send, and organize email in a self-hosted inbox through private MCP tools.

A Model Context Protocol server for Plunk, the open-source self-hosted email platform. Provides 84 tools for transactional email, contacts, campaigns, segments, templates, workflows, events, and analytics through the Plunk API.

Provides a standardized interface for interacting with Mailchimp's tools and services through the Model Context Protocol, enabling easy management of Mailchimp campaigns, audiences, and reports via natural language commands.

Provides a standardized interface for interacting with Google Mail tools and services through the Model Context Protocol, enabling email management via natural language.

Exposes 25 tools for Claude Code across Gmail, Calendar, Drive, Docs, Sheets, and Slides. Supports multi-account, local-first, encrypted OAuth tokens.

Enables AI agents to send emails and manage sending domains, templates, analytics, and content checks through the SendByte platform using the Model Context Protocol.

Enables sending emails and listing sent emails with delivery status and open/click counts via the Maillog API.

Private, EU-hosted email for AI agents over the open JMAP standard. Read, search, reply in-thread, organize and send from your own mailbox; sending is pinned to the signed-in mailbox.

Enables AI agents to search, read, send, and organize Gmail emails via MCP protocol.

Enables Gmail, Google Calendar, and Google Drive access through the Model Context Protocol, supporting email management, event scheduling, and file operations.

A Model Context Protocol (MCP) server that enables Claude Desktop to manage emails via SMTP and IMAP. Send emails, fetch unread messages, and create draft replies directly from conversations.

Connects AI assistants to BillionVerify email verification via the Model Context Protocol, supporting single and batch email verification, account balance checks, and webhook management.

Gmail MCP server for searching, reading, and sending mail over MCP.

Enables reading Gmail emails through the Model Context Protocol, supporting listing, searching, and retrieving email details with OAuth 2.0 authentication.

Provides 28 tools to read, search, send, and manage Yandex Mail emails via the Model Context Protocol.

Lets AI tools send transactional emails, check status, and manage contacts through the Model Context Protocol.

Outbound sales agent for Claude Code. MCP server handles prospect list building, dedup, quotas, and structured rejection feedback, while the plugin runs per-prospect research, email writing, Gmail sending, and reply tracking. Open source, self-hostable.

MCP server for Open-Xchange & standards-based mail: email (IMAP/SMTP), Sieve filters, CalDAV calendar, CardDAV contacts, free/busy.

A Model Context Protocol server for Google Workspace integration with send-as alias support, email templates, and scheduled send, enabling AI assistants to manage Gmail and Google Calendar through natural language.

Multi-account Gmail integration for AI assistants via the Model Context Protocol (MCP).