Nextmail

sh.nextmailPublished by nextmail.shOfficial publisherv1.0.6Updated Nov 1, 2026

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

VerifiedStreamable HTTPWeb executableDeveloper ToolsCommunication & Collaboration

Overview

AI-generated overview

Remote Nextmail MCP server that lets an assistant send email and work through your own Nextmail mailbox under OAuth-approved permissions.

What you can do
  • Send email from an agent using the Nextmail SDKs, API or CLI
  • Work through an inbox over MCP: read messages and make changes, with each tool marked as reading or changing
  • Catch verification emails in sign-up tests using disposable inboxes
  • Create a Nextmail account and verify it with a six-digit emailed code
  • Follow guidance for moving an existing setup from Resend
When to use it
Useful when you want an assistant to send mail or triage an inbox from your own Nextmail workspace, or when tests need to receive verification emails. Also handy if you are migrating email sending from Resend.
Requirements
A remote endpoint at api.nextmail.sh/mcp reached over HTTPS; nothing runs locally. A Nextmail account, with OAuth sign-in in the browser where you choose permissions and allowed addresses. An account can be created by the agent, verified with a six-digit code sent to your email, which also yields an API key for the CLI and API.
Before you install
The agent can send and change email in your workspace, so review the permissions and addresses you approve on the OAuth consent page and narrow or remove the connection later under Connected apps. Account sign-up hands the agent an API key. Mail content and account data go to Nextmail, a third-party service.

Installation

In SourceWeft

  1. Open Nextmail in the dashboard and add it to a workspace.
  2. Connect the required credentials. They are stored privately and never shown on public pages.
  3. Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Use with an agent

Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.

Read https://sourceweft.com/mcp/sh.nextmail%2Fmcp/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.

Read the install guide the agent follows

Other MCP clients

Add this to your client's mcpServers config. The client completes OAuth sign-in on first connect.

{
  "mcpServers": {
    "nextmail": {
      "type": "http",
      "url": "https://api.nextmail.sh/mcp"
    }
  }
}

README

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

text
/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:

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

Gemini CLI

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

Any agent that reads skills

bash
npx skills add nextmailhq/mcp

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

Any other agent. Ask it to read this one Markdown page, which says how to connect over MCP, the command line or the API, and what to ask you before it sends anything: https://nextmail.sh/agent.md

No account yet

An agent can create the account for you, and your only part is the six-digit code emailed to you. It starts a sign-up with your address at POST https://api.nextmail.sh/signups, you give it the code, and POST https://api.nextmail.sh/signups/{id}/verify creates the account and gives the agent an API key for the command line and the API. Neither call needs a key, and npx @nextmail/cli signup --email <address> does both steps. To connect over MCP as well, set a password from the welcome email, then sign in as above.

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.

Source: README.md at commit 3a319e8

Tools

0
This server asks you to sign in, so SourceWeft could not read its tools without an account and has not indexed them. What a connected account sees can depend on that account and its permissions.

Version history

3
  1. v1.0.6LatestNov 1, 2026
  2. v1.0.5Oct 25, 2026
  3. v1.0.3Oct 25, 2026

Score

85% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

  • Reached in the last 30 daysRequired25 pts
  • Auth declaredRequired10 pts
  • Tools listed15 pts

    Answer tools/list without a credential, or ship a package that starts in a sandbox without one.

  • DescriptionRequired15 pts
  • Logo10 pts
  • Documentation15 pts
  • License10 pts