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"Connecting to a vector knowledge base" matching MCP servers:

  • gmail-mcp-send-to-list-only

    bajor
    F
    license
    A
    quality
    A
    maintenance
    An MCP server that sends plain-text Gmail messages only to a predefined allowlist, using generated recipient IDs instead of email addresses to enforce security.
    2
    1

  • inbox-to-action-mcp

    tarunlnmiit
    A
    license
    A
    quality
    A
    maintenance
    One-pass agentic inbox triage as an MCP server: fetch unread Gmail → classify (action_needed/fyi/newsletter/noise) → summarize → extract tasks → draft replies as Gmail DRAFTS (never sends) → flag calendar → write a triage report. Four stdio tools (fetch_emails, save_gmail_draft, append_tasks, write_report); the host is the LLM, so it runs keyless in Claude Code. Gmail scopes: readonly + compose
    4
    MIT

  • mcp-clay-to-instantly

    mambalabsdev
    A
    license
    A
    quality
    B
    maintenance
    Enables pushing enriched leads into Instantly or Smartlead campaigns with ICP score gating, deduplication, and dry-run previews via an Apify actor.
    1
    85
    MIT

  • shipmail-mcp

    shipmail-to
    A
    license
    A
    quality
    A
    maintenance
    Official MCP server for Shipmail, enabling agents to manage domains, mailboxes, messages, threads, webhooks, and suppressions via natural language.
    100
    324
    1
    MIT

  • DragApp MCP Server

    nick-timms
    A
    license
    B
    quality
    C
    maintenance
    MCP server for Gmail shared inboxes and WhatsApp — read, reply, search, and organize your team's email from Claude, ChatGPT, or Cursor. 47 tools covering email threads, WhatsApp messaging, boards, contacts, knowledge base, analytics, and automations.
    47
    182
    1
    MIT

  • Exchange EWS MCP

    ShermanGu
    A
    license
    -
    quality
    A
    maintenance
    A local MCP server for on-premises Microsoft Exchange, connecting via EWS and NTLM. It provides mail, template, availability, and calendar workflow tools through stdio, with draft-first safety and Windows Credential Manager integration.
    6
    MIT

  • MCP Calculator

    abenitez573
    F
    license
    -
    quality
    B
    maintenance
    An MCP server that enables AI models to perform mathematical calculations and other tasks like email operations and knowledge search through a bidirectional communication protocol.

  • atxp-mcp

    autonsol
    F
    license
    A
    quality
    D
    maintenance
    Access 5+ ATXP agent tools via MCP: web search, AI image generation, email, and music generation. Free tier with pay-per-use Pro tier via x402 micropayments (USDC on Base mainnet).
    5

  • Gmail AI Agent MCP Server

    0x8687
    A
    license
    A
    quality
    C
    maintenance
    Enables AI assistants to connect to Gmail accounts, check connection status, and send emails through a secure OAuth 2.0 interface.
    12
    Apache 2.0

  • MailOKF MCP

    pat229988
    A
    license
    C
    quality
    B
    maintenance
    A local-first Python MCP server that turns Gmail, Outlook/Microsoft 365, iCloud Mail, and generic IMAP/SMTP mailboxes into a synchronized, searchable OKF knowledge layer, exposing 38 tools and four resources for mailbox actions, synchronization, retrieval, attachments, and optional semantic search while keeping the provider mailbox authoritative.
    38
    MIT

  • stalwart-mail-mcp

    freefrank
    A
    license
    -
    quality
    C
    maintenance
    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.
    MIT

  • mcp-outlook-lite

    w21180239
    A
    license
    -
    quality
    D
    maintenance
    Lightweight MCP server that enables AI agents to manage Microsoft Outlook email, calendar, and files using PKCE authentication with only a Client ID.
    MIT

  • email-verification

    Br0ski777
    A
    license
    -
    quality
    B
    maintenance
    Real-time email verification API with syntax, MX, disposable detection, role-based flags, quality score 0-100. Built for agent outreach pipelines with pay-per-call via x402 (USDC on Base L2) -- no API key, no signup, no rate-limit wall.
    MIT

  • outlook-mcp

    dbfournier33
    A
    license
    -
    quality
    C
    maintenance
    An MCP server that gives AI agents structured access to a Microsoft Outlook mailbox through the Microsoft Graph API, with a deliberate constraint: agents can read and draft emails, but only humans can send.
    42
    MIT

  • Gmail MCP Server

    sebastianall1977
    A
    license
    -
    quality
    D
    maintenance
    A standardized MCP server for managing Gmail, including sending, drafting, labels, threads, and settings via OAuth2 authentication.
    MIT

  • NornWeave

    DataCovey
    A
    license
    -
    quality
    A
    maintenance
    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.
    27
    Apache 2.0

  • AI Business MCP Server

    sohaggain
    A
    license
    -
    quality
    C
    maintenance
    A production-style MCP server exposing six business tools (web search, database, CRM, email, calendar, analytics) to AI clients via a secure, authenticated interface, with mock mode and a reference agent client.
    MIT