"MCP servers that don't require API keys" matching MCP servers:

Enables AI agents to analyze whether they should send an email, evaluating passive aggression and regret probability with a recommendation heavily weighted toward no.

An MCP server that provides AI agents with direct access to authoritative Cakemail API specifications, enabling accurate code generation and eliminating hallucination.

Enables to interact with Nylas API for email, calendar, and contacts via MCP, providing documentation, code samples, and code generation tools.

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

MCP server for inspecting email domains and addresses, providing objective domain-level email infrastructure answers such as MX, SPF, DMARC, MTA-STS, and disposable-domain evidence.

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.

MCP server wrapping Samotpravil API documentation, providing tools to search for methods, parameters, and examples, with optional proxy to the live API.

Send email, find out why an email failed, set up sending domains, and manage templates, contacts, lists and campaigns in your AhaSend account.

Find professional email addresses from name + company domain. Tests 15+ patterns against MX records with confidence scoring, with pay-per-call via x402.

Audits email deliverability configuration for a domain, checking SPF, DKIM, DMARC, and MX records, returning a score and recommendations.

Enables AI assistants to browse, inspect, and call the Cakemail API via dynamically loaded OpenAPI spec.

Create disposable email inboxes, extract OTP codes in 15 languages, and receive webhooks — all from your AI agent. One call: create inbox → wait for email → get the verification code. Supports 7 domains, email forwarding, and HMAC-signed webhooks with OTP included in payload. Free tier available.

Official Emailit MCP server: send transactional email and manage domains, contacts, audiences, templates, suppressions, webhooks, and API keys with an Emailit API key, over stdio or HTTP.

Enables creation and management of disposable receive-only inboxes through tools that create a mailbox, list and read messages, and delete it after confirmation, without requiring API keys or existing email credentials.

Enables an AI assistant to access and manage mail, calendar, contacts, files, sharing, and Sieve through a local Stalwart JMAP server, with configurable write policies that require confirmation for irreversible actions.

Enables Claude to read, search, organize, and clean up Yahoo Mail emails over IMAP without Yahoo API keys.

Enables personalized cold email outreach through research, drafting, template management, and deliverability checks, all locally with no required API keys.

Enables AI agents to send transactional emails and manage email infrastructure through the AgentiSend API, including domain verification, budgeted keys, and message logs.

Enables AI agents and applications to send emails through Cloudflare's Email Service, supporting HTML bodies, multiple recipients, attachments, and Bearer token authentication.

Enables coding agents to read and manage Google Workspace apps like Gmail, Drive, Docs, Sheets, and Calendar through 41 tools, with staged writes that require review and explicit commit before any change is applied.