"Free Network Graph Visualization Tools (No Account Required)" matching MCP servers:

Provides read-only access to Postmark across all servers of one or more accounts, letting users list servers and message streams, search outbound messages and bounces, fetch per-message event timelines, review suppressions, and pull delivery stats without any send, create, update, or delete operations. Account API tokens are auto-discovered per server so newly added servers and accounts are picked up without reconfiguration.

Enables local, read-only access to multiple Gmail and Google Drive accounts through explicit per-account aliases, using bring-your-own Google OAuth with secure credential storage and no telemetry or write capabilities.

A secure email gateway MCP server that protects AI agents from prompt injection attacks by scanning emails for malicious instructions before they reach the agent.

Enables Claude to connect unlimited Gmail and IMAP mailboxes, search and triage them together while identifying each account, read attachments, and create drafts or perform permitted mailbox actions under configurable safety modes.

A local MCP server that manages multiple Gmail accounts simultaneously, allowing MCP clients to switch between accounts per request without logging out or in. It securely stores OAuth tokens in the macOS Keychain.

Enables Claude to access and manage multiple Google accounts at once across Gmail, Calendar, Drive, Contacts, and Tasks, with unified search and document text extraction.

A local-first MCP server for managing multiple Gmail accounts with separate OAuth grants, supporting search, retrieval, labels, drafts, and attachments while deferring direct send and destructive actions for safety.

Enables Claude to read, search, send, and organize mail and manage calendars across many Gmail and Google Workspace accounts at once, routing each call by account label, address, or domain, or fanning out across all of them. Includes draft-first sending, an optional auto-forward allowlist, health checks, and an audit log.

Enables to manage your Outlook mailbox via Microsoft Graph (write access) with delegated permissions, providing MCP tools to create, modify, and send emails, folders, categories, rules, and automatic replies.

An MCP server for Microsoft Graph, exposing 60 tools across calendar, email, meetings, Teams chat, files, people, directory, tasks, and OneNote over stdio or Streamable HTTP.

Enables natural language interaction with multiple Google accounts (Gmail, Drive, Calendar) from MCP-compatible clients like Claude.

Enables controlled Microsoft 365 mail workflows including search, read, thread, attachment, and managed draft operations through Microsoft Graph, without sending or modifying messages.

A modular Model Context Protocol server for Microsoft Graph and Microsoft 365, enabling users to manage Teams, mail, calendar, To Do, contacts, and Outlook settings through natural language.

Enables Claude and Gemini to access and manage multiple Google accounts simultaneously across services such as Gmail, Drive, Calendar, YouTube, Sheets, Analytics, AdSense, and Fitness, with create, read, update, and delete operations. It runs locally without external intermediaries to keep account access private.

Connects Claude Code and Codex to Microsoft Teams, Outlook mail and calendar, online meetings, OneDrive, users, tasks, and presence through Microsoft Graph, exposing tools for messaging, scheduling, file management, and collaboration operations.

A collection of MCP servers for Apple macOS apps (Mail, Contacts, Notes, Memory, Messages, Calendar, Reminders) enabling AI assistants to read, search, create, and update data via JXA, SQLite, and EventKit.

A collection of three zero-dependency MCP servers for web scraping via Chrome DevTools Protocol, crypto wallet and price monitoring, and email validation with SMTP sending.

Enables AI agents to access 13 paid micro-tools over x402, paying per request in USDC on Base without API keys or signup. It covers email deliverability, grading, and templates, plus utilities like crypto prices, domain age, hashing, JSON conversion, JWT decoding, regex, slugs, UUIDs, and weather.

Query your domains, sender compliance status, and Gmail traffic metrics from Claude, Cursor, or any MCP client using the Gmail Postmaster Tools API.

Enables AI assistants to securely operate Microsoft 365 services, including Outlook email drafting/sending, Teams messaging, and user profile retrieval, through MCP over Streamable HTTP. Deployable on Google Cloud Run with managed authentication via Microsoft Entra ID.

A minimal MCP server for sending plain-text emails and managing Gmail user labels over stdio, using only gmail.send and gmail.labels OAuth scopes.

Enables AI assistants to manage Microsoft 365 email, calendar, and contacts through natural language, with zero Azure setup required.

MCP server for email deliverability: validate SPF/DKIM/DMARC/BIMI, check blacklists, test SMTP/IMAP, look up DNS, and generate ready-to-deploy records for any major email provider. Ships with two one-click prompts (audit-deliverability, setup-dns). Public, no auth.

Multi-account Google MCP server providing read access to Gmail and Calendar via stdio. Supports secure authentication for personal and work accounts with OAuth and keychain token storage.

Enables MCP clients to securely access and operate a Microsoft 365 tenant through the full Microsoft Graph API, covering mail, calendar, files, Teams, SharePoint, Planner, OneNote, Excel, admin, security, and more with 219 tools and guarded write capability.

A utility MCP server providing 10 specialized tools for newsletter content preparation and optimization, including subject line generation, HTML-to-text extraction, read time estimation, and email validation. Enables newsletter operators, developers, and content teams to automate pre-send workflows and audit newsletter issues through natural language interactions.

Enables Claude Desktop to interact with multiple Gmail accounts via MCP, providing tools for sending, searching, reading, labeling, filtering, thread management, drafts, and attachments. It also ensures correct thread replies and recoverable deletes.

A Model Context Protocol server that provides tools for weather forecasting and Gmail interaction.

Connects multiple Gmail and Google Calendar accounts to Claude Desktop locally, enabling email management (search, send, draft, label) and calendar operations (list events, search) via natural language.

A local MCP server that connects multiple Gmail and Google Calendar accounts to Claude Desktop, enabling email and calendar management across accounts.

A local MCP server that connects multiple Google accounts to Claude Desktop, enabling unified email search and send, calendar events, and full CRUD on Google Docs, Sheets, and Forms.

Enables AI assistants to interact with Gmail and Google Docs, allowing them to send emails, create drafts, append content to documents, and retrieve document information.

Enables Claude.ai and Claude Code to read and write a single Gmail mailbox, including search, drafts, sending, and label management.

An MCP server for managing Proton Mail, Pass, Drive, and Calendar through local IMAP/SMTP, pass-cli, and Proton Drive CLI, enabling AI agents to operate the mailbox, manage passwords, sync files, and classify emails.

Connects a single Mail.ru mailbox to ChatGPT through Google OAuth and IMAP, enabling folder listing, email search, non-destructive reading, moving messages, and moving selected messages to the trash.

Enables Claude to read, search, send, label, and trash emails in any Gmail account via Google's Gmail API, using OAuth2 authentication with automatic token refresh.

A full-featured Model Context Protocol server that gives AI assistants real-time access to Google Workspace services including Drive, Gmail, Calendar, Sheets, Docs, and Apps Script.

Exposes 22 typed, read-only MCP tools that let an agent answer questions about a student's own Ed discussion threads, Moodle deadlines and course materials, Gmail inbox, and OnTrack task feedback. Runs locally over stdio with credentials captured once by a CLI login, so the agent never handles passwords and never writes to any service.

A local MCP server that gives Claude access to multiple Gmail accounts simultaneously for search, read, draft, send, label, and a scheduled cross-inbox digest, with enforced send policies per mailbox.

Enables AI agents to interact with Google Workspace services (Gmail, Drive, Docs, Tasks, Calendar) through OAuth 2.0 authentication, providing 25+ operations for business automation and productivity.