"ClickHouse: A fast open-source columnar database management system" matching MCP servers:

A Gmail MCP server providing 19 tools for email operations, label and filter management, and attachment handling via the Gmail API.

Enables AI assistants to read, send, search, and manage emails in Apple Mail on macOS.

Enables AI assistants to interact with Microsoft 365 and Office services through the Microsoft Graph API, providing tools for email, calendar, files, Teams, SharePoint, and more with configurable permissions and output formats.

Enables AI agents to send emails, create drafts in Gmail, and append content to Google Docs via standardized MCP tools.

MCP server for recruiting pipeline that evaluates resumes against job descriptions, syncs to Google Sheets, and drafts emails via Gmail.

Automates HR workflows such as employee onboarding, leave management, meeting scheduling, and ticket handling through natural language, with email notifications and demo data.

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.

A local-first open-source MCP server that acts as a personal secretary, memory manager, and automation hub—it syncs Calendar, Gmail, Canvas, GitHub, and Health into a typed temporal memory graph, and enables approval-gated write actions like creating events, drafting/sending mail, and filing issues, all with telegram/slack/CLI interfaces and a SQLite-backed audit trail.

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.

An open-source project for a local iCloud Mail MCP integration. Currently provides only contribution and quality foundations, with Apple Mail access and MCP features deferred.

Open-source, self-hosted Inbox-as-a-Service API for AI agents. It enables agents to manage email inboxes, send/receive emails, search messages, and wait for replies via REST or MCP.

MCP server for Apple Mail that reads from Mail's SQLite store for fast queries and writes through Mail.app via AppleScript, enabling mailbox management, search, drafts, and message updates without sending mail.

An open-source MCP server that provides AI agents with secure access to read, search, and manage emails via Microsoft 365 and Gmail. It features security-first defaults like recipient allowlists and markdown content conversion to facilitate safe agent interaction with mailboxes.

Enables AI agents to query and recall your entire Gmail inbox locally, providing fast summarization and semantic search without relying on Gmail's search API.

A read-only MCP server for Apple Mail on macOS that enables searching and reading emails directly from the local SQLite database, with fast SQL-level filtering and pagination.

Synchronizes multiple Gmail and Google Workspace accounts into a local SQLite database and exposes search and mailbox operations through a stdio MCP interface.

Unifies fast on-disk read and search with complete AppleScript writes, behind a mandatory safety layer with read-only mode, batch caps, dry-run, and undo for reversible operations.

Enables AI-powered email management through Gmail, including search, send, drafts, labels, and an intelligent agent with human approval workflow and optional customer database integration.

A collection of MCP servers for database management and Gmail integration, allowing AI agents to perform database queries and email operations.

An MCP server that exposes a local notmuch email database to an LLM client such as Claude. It is read-first: searching, reading, and understanding mail is always available; writing anything (drafts, tags, exported files) requires an explicit opt-in flag and is confined to clearly bounded locations.