Email Inbox API + Sending by Sendmux: MCP server

What Email Inbox API + Sending by Sendmux does

According to its repository: “Email inboxes for AI agents via Sendmux: receive, search and send mail.”

The Model Context Protocol (MCP) is a standard plug between an AI agent and an outside service: once the server is connected, its tools show up in the agent, which decides when to call them. Email Inbox API + Sending by Sendmux is listed under Messaging and email, a category of 107 servers in the directory, where it ranks #41 by stars.

Topics declared by the repository: cli, cli-tool, email, email-automation, email-marketing, inbox.

Installing and connecting Email Inbox API + Sending by Sendmux

Distribution modes declared in the official MCP registry:

• npm package (Node.js, usually started with npx)
• PyPI package (Python, started with uvx or pip)
• remote server (streamable-http): you connect to it by URL, with nothing to install locally

It works with any MCP-compatible client (Claude Desktop, Claude Code, Cursor, VS Code, Codex and most recent agents). You add one entry to the client's MCP configuration: server name, start command or URL, environment variables. Project language: Python.

The registry lists 3 secret variables to provide (API key, access token). Keep them in the client's environment variables, never in a shared file or a repository.

Security: what to check

Connecting an MCP server means installing software that talks straight to your agent: it runs with your rights and the model trusts its tool descriptions. The risk therefore depends on what it can touch and how far its code can be trusted.

Points found for Email Inbox API + Sending by Sendmux:

• Secrets: the server acts with your credentials. Create a dedicated key with minimum rights and an expiry date.

Good practice: grant only the rights needed (least privilege), require human approval for irreversible actions, and run the AI agent security check.

Project activity and maintenance

Created on May 30, 2026, the Sendmux/sendmux-sdk repository has 62 stars and 1 forks, with 0 open issues. It has more stars than 56% of the servers in the directory. It received changes this month. Version published in the registry: 2.2.0 (October 2, 2026).

Stars measure attention, not quality: a recent, heavily promoted project can collect them fast, while a useful but niche server will have few.