"RAG MCP servers with quality validation" matching MCP servers:

Email validation MCP server using MailboxValidator API to determine validity of an email address.

MCP server for Claude Code CLI that integrates with Google Workspace, enabling management of Docs, Sheets, Drive, Gmail, Calendar, and Apps Script.

Validates email deliverability, assesses domain credibility, and scores B2B leads from A-F to help prioritize outreach, with batch processing and a free tier.

A comprehensive MCP server integrating Google Docs, Sheets, Drive, Gmail, Calendar, and Apps Script APIs, featuring unique Apps Script support for AI-driven automation.

Give AI agents their own email inboxes. Create, send, receive, and manage email entirely via MCP tools.

MCP server that exposes Gmail and SAP tools, enabling natural-language email management and SAP data browsing through a Mistral-powered AI assistant.

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

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.

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.

A native MCP server for real-time B2B contact finding and SMTP email validation, scraping company websites, Discord, and Telegram to deliver live, verified contacts that AI agents like Claude and Cursor can query directly.

Email validation and SMTP verification for Claude Desktop, Cursor, and Claude Code

MCP server that enables email management (send, read, search, delete, etc.) via IMAP/SMTP, compatible with Gmail, Outlook, Yahoo, iCloud, and other standard mail servers.

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

MCP server for emailfinder.dev that enables AI assistants to find verified professional email addresses via name/domain, LinkedIn URLs, company domains, roles, and email validation.

Enables AI assistants to validate email addresses, track validation tasks, view per-address results and account analytics, and export cleaned email lists through the UChecker API.

Provides a standardized interface for interacting with Unipile's tools and services through a unified API.

Enables email address validation and outbound email status checking for the Xeams on-premise email server via MCP tools.

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.

Enables interaction with Microsoft Outlook through a unified API, supporting tools for email, calendar, and contacts management via natural language.

Connects AI agents to self-hosted Stalwart mail servers via a Cloudflare Worker and JMAP, enabling mailbox search, reading, listing, and two-step draft-and-send email operations through MCP.