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"Services or tools that don't require a separate API key" matching MCP servers:

  • google-services-mcp

    nabheet
    A
    license
    B
    quality
    A
    maintenance
    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.
    60
    481
    MIT

  • mcp-send-that-email

    pipeworx-io
    A
    license
    -
    quality
    C
    maintenance
    Enables AI agents to analyze whether they should send an email, evaluating passive aggression and regret probability with a recommendation heavily weighted toward no.
    11
    1
    MIT

  • macos-mcp-tools

    HachiTogo
    A
    license
    -
    quality
    A
    maintenance
    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.
    12
    MIT

  • Gmail Postmaster Tools MCP

    optipub
    A
    license
    -
    quality
    B
    maintenance
    Query your domains, sender compliance status, and Gmail traffic metrics from Claude, Cursor, or any MCP client using the Gmail Postmaster Tools API.
    6
    MIT

  • email-validator-api

    lazymac2x
    F
    license
    -
    quality
    D
    maintenance
    Comprehensive email validation MCP server that checks syntax, MX records, disposable domains, role-based accounts, SPF/DKIM, typo suggestions, and risk scoring.

  • mailX tools

    Mailwarm
    A
    license
    A
    quality
    D
    maintenance
    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.
    17
    MIT

  • Newsletter Tools

    josephtandle
    F
    license
    -
    quality
    D
    maintenance
    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.
  • Sendmux Email Inbox API + Sending by Sendmux

    Sendmux Email Inbox API +official

    Sendmux
    A
    license
    A
    quality
    A
    maintenance
    Sendmux is an email inbox API and email API for AI agents. Use this MCP server to let authorised agents work with Sendmux mailboxes, inbound email, clean JSON parsing, webhooks, outbound sending, provider routing, logs, billing, and team controls.
    30
    86
    MIT

  • Samotpravil MCP

    dkanster
    A
    license
    D
    quality
    C
    maintenance
    MCP server wrapping Samotpravil API documentation, providing tools to search for methods, parameters, and examples, with optional proxy to the live API.
    58
    48
    MIT

  • Gmail MCP Server

    ryantorno-arch
    A
    license
    -
    quality
    C
    maintenance
    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.
    67
    MIT

  • Email Finder API

    Br0ski777
    A
    license
    -
    quality
    B
    maintenance
    Find professional email addresses from name + company domain. Tests 15+ patterns against MX records with confidence scoring, with pay-per-call via x402.
    MIT

  • Email Deliverability Audit API

    Br0ski777
    A
    license
    -
    quality
    B
    maintenance
    Audits email deliverability configuration for a domain, checking SPF, DKIM, DMARC, and MX records, returning a score and recommendations.
    MIT
  • Cakemail API MCP Server by cakemail

    Cakemail API MCP Serverofficial

    cakemail
    F
    license
    -
    quality
    D
    maintenance
    Enables AI assistants to browse, inspect, and call the Cakemail API via dynamically loaded OpenAPI spec.