"The most widely used models" matching MCP servers:

The most complete Resend MCP server — full coverage of the Resend API (emails, domains, contacts, broadcasts, templates, segments, topics, webhooks, logs) plus a unique debug/diagnostics layer no other Resend MCP offers: deliverability analysis, DNS troubleshooting, email lifecycle inspection, bounce explanation, and account auditing. Works with Claude Code, Cursor, Claude Desktop, and any other

Enables AI assistants to manage Microsoft Outlook Desktop (Classic) calendar and email through local COM automation, without Microsoft Graph or Entra registration.

Provides a minimal Microsoft 365 MCP server with fourteen hand-written tools for email, people, and drafts, designed to fit small local models.

MCP server for disposable email. Gives an assistant its own throwaway inbox, then hands back the confirmation code out of the message that arrives.

Enables AI agents to send emails and manage sending domains, templates, analytics, and content checks through the SendByte platform using the Model Context Protocol.

Enables AI assistants to generate temporary email addresses, check inboxes, and read messages using the 1TempMail API.

The email API your AI agent can actually use. A Model Context Protocol server for Send16 that gives Claude, Cursor, and any MCP client 79 tools to send transactional & marketing email, manage contacts, audiences, segments, automations, templates, the inbox, suppressions, and webhooks.

Connects AI assistants to the complete Salesforge product suite, enabling management of workspaces, contacts, sequences, mailboxes, domains, and more across multiple sales tools.

Read and write email through the Atomic Mail from an AI agent. Handles proof-of-work authentication and JMAP so the agent thinks in JMAP method calls. Use when the user asks to register an email inbox, list mailboxes, fetch or send email.

Mu is an MCP server and web app that provides agents and humans access to real-world services like news, web search, mail, markets, weather, video, places, images, files, calendar, and contacts. It offers a wide range of tools and can be self-hosted or used live at micro.mu.

Enables Claude mobile and claude.ai to access your Spark Desktop mailbox by exposing the official Spark MCP server over authenticated Streamable HTTP, with safety gates for read-only and send permissions.

Describe an app event — order_shipped, payment_failed — and Sendable writes the transactional email and sends it. Your data values are inserted verbatim, never rewritten.

Secure multi-tenant proxy exposing 34 MCP tools to manage Keila contacts, campaigns, forms, segments, templates, and transactional messaging through the Keila REST API.

Exposes Gmail inbox actions (list, archive, label) as MCP tools via a browser extension and local bridge, without requiring the Gmail API or OAuth.

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.

Enables AI assistants to send, read, search, and organize Proton Mail email via SMTP and IMAP through the Model Context Protocol.

A Windows-first Python MCP server for Gmail that reads unread emails and creates correctly threaded draft replies using the Gmail API.

Enables AI assistants to send, read, search, and manage Gmail emails, drafts, and labels via the Model Context Protocol.

An MCP server that provides Gmail access for LLMs, enabling email composition, sending, searching, and label management via the Gmail API.

Wraps the Hunter.io email finder and verification API, enabling email lookup and verification via MCP.