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Nextmail

Official registry Productivity

AI-native email for businesses, developers, and AI agents.

Source code Website Documentation

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

Remote (streamable-http)
Claude Code 
claude mcp add --transport http nextmail 'https://api.nextmail.sh/mcp'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "nextmail": {
            "type": "http",
            "url": "https://api.nextmail.sh/mcp"
        }
    }
}

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

Contents
  1. Nextmail for AI agents
  2. What is in it
  3. Install
  4. What it runs, sends and fetches
  5. Privacy, terms and support
  6. License

Nextmail for AI agents

Email for AI agents and for the people who build them, from Nextmail. This repository connects your agent to your own Nextmail mailbox, and teaches it the jobs people most often hand to an agent: sending email from code, working through an inbox, catching verification emails in tests, and moving from Resend.

What is in it

  • One MCP server, https://api.nextmail.sh/mcp, the remote server Nextmail runs. Your client signs in with OAuth in the browser, and on the consent page you choose which permissions and which addresses the agent may use. You can narrow or remove the connection later under Account, Connected apps.
  • Four skills, in skills/: sending email with the SDKs, the API or the CLI; working in a mailbox over MCP; disposable inboxes for sign-up tests; and moving from Resend.

Install

Claude Code

/plugin marketplace add nextmailhq/mcp
/plugin install nextmail@nextmail

Claude, ChatGPT and other chat apps. Add https://api.nextmail.sh/mcp as a custom connector.

Codex. Add this to ~/.codex/config.toml:

[mcp_servers.nextmail]
url = "https://api.nextmail.sh/mcp"

Gemini CLI

gemini extensions install https://github.com/nextmailhq/mcp

Any agent that reads skills

npx skills add nextmailhq/mcp

Cursor, VS Code, Windsurf and other MCP clients. See https://nextmail.sh/docs/mcp/connect.md

What it runs, sends and fetches

Nothing in this repository runs on your machine. The skills are written instructions, and the plugin adds one remote MCP server, which your client reaches over HTTPS at https://api.nextmail.sh/mcp once you have signed in. Its tools act on your Nextmail workspace, with the permissions you approved, and every tool is marked as reading or as making changes, so your client can ask before anything is sent or changed. The skills link to the documentation at https://nextmail.sh, and to the Nextmail SDK and CLI packages, which are installed only if you choose to.

Privacy, terms and support

License

MIT. See LICENSE.

Frequently asked questions

What is Nextmail?

AI-native email for businesses, developers, and AI agents.

How do I install Nextmail?

It runs as a remote server. In Claude Code: claude mcp add --transport http nextmail 'https://api.nextmail.sh/mcp'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does Nextmail need an API key?

Its registry entry lists no required key or secret. Some features may still need an account with the service it connects to.

Is Nextmail open source?

Yes. Its code is on GitHub under the MIT license.

Who maintains Nextmail?

It is published by nextmailhq. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.