"Free APIs and services without commercial fees" matching MCP servers:

MCP server that gives AI agents direct access to Google services including Gmail, Calendar, Drive, and more, with multi-account OAuth support. Enables reading and sending email, managing calendar events, and interacting with Google files through natural language.

Enables AI agents to send and draft Gmail emails and append content to Google Docs through standardized MCP tools.

MCP server for Claude Desktop providing access to Google Sheets, Gmail, and Google Calendar.

An MCP-compliant server that exposes Gmail and Google Docs as tools, enabling AI agents to draft, send, and manage emails, as well as create, read, and append to documents through natural language.

An MCP server that exposes Google Docs and Gmail capabilities to LLMs via SSE transport.

Provides MCP tools for searching, reading, and drafting Gmail emails, as well as querying SAP OData endpoints with safe read operations and mock mode.

Agent-native cold-email infrastructure providing ~12 high-level tools for domain setup, mailbox provisioning, campaign launch, inbox management, and metrics, all operated via MCP or CLI.

Enables local automation of classic Outlook for Windows via COM, allowing email search, folder listing, calendar leave block creation, and contact/recipient management without needing cloud APIs or admin approval.

MCP server that lets agents check domain email authentication (SPF, DKIM, DMARC, MX) via a free API, returning grades and shareable report URLs. Also provides tools for listing paid services and partner program terms.

Turns your running Outlook Desktop into an MCP server, enabling email, calendar, tasks, and attachment management through your existing Outlook session without any cloud APIs.

Enables AI-driven customer support ticket processing, including classification, response generation, and automated email sending and Google Sheets logging.

Provides AI assistants with access to Google Workspace APIs including Sheets, Calendar, Gmail, Tasks, Drive, and Docs. Enables full CRUD operations and management of Google services through natural language.

Enables MCP-compatible AI agents to draft and send Gmail emails and append content to Google Docs without needing to understand Google's APIs.

Enables AI agents to send emails and manage tasks in Microsoft To Do with scoped, low-risk access to Microsoft Graph.

Fetch fresh leads and verify emails in one MCP server

MCP server that enables AI agents to check if email addresses or domains are disposable using the isitdisposable.com API. It provides tools like check_email, check_domain, and check_batch for real-time validation.

Detects whether a company runs cold email outbound and identifies the email sending infrastructure, including sending domains, platforms, and authentication status.

Provides email validation and domain configuration auditing tools for AI assistants, enabling single address checks, bulk list cleaning, SPF verification, and full mail setup grading (A-F) with actionable fixes.

MCP server that sends mail over SMTP, gated behind an allowlist and a human confirmation

Enables read-only access to a single Gmail mailbox, listing emails within a date range and retrieving full headers and body text of individual emails, with deep-link jump URLs for each result.