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Mailly

by superagents-labversion 0.3.1i★ –iRuns in the cloud
Registry namesite.mailly/mcp

Install

Overview

Description from the maker (original English)

A real inbox for agents: read mail, draft replies you approve, wait for verification codes.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Install

Pick the AI app you use, then copy the settings.

Before you install

  • Basic checks: 1 of 1 passed
  • Runs on the maker’s server: what you ask it goes through their server.
  • The registry lists no key to fill in.

You need

Which app do you use?

Pick your app above. We remember it, so next time the button says “Install in …”.

Works in Claude on the web, desktop and mobile:

  1. Open Settings → Connectors
  2. Press Add custom connector
  3. Paste the address below and press Add
  4. If it asks you to sign in, sign in with the maker
SettingsConnectors1+ Add2https://…3
https://mcp.mailly.site/mcp

Run this in your terminal

claude mcp add --transport http mailly https://mcp.mailly.site/mcp

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "mailly": {
      "url": "https://mcp.mailly.site/mcp"
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "mailly": {
      "type": "http",
      "url": "https://mcp.mailly.site/mcp"
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

ChatGPT connects only to servers on the internet:

  1. Open ChatGPT on the web → Settings → Connectors (Apps)
  2. Press Create or Add (some plans need Developer mode under Advanced first)
  3. Paste the address below, give it a name and save
  4. If it asks you to sign in, sign in with the maker
SettingsConnectors1+ Create2https://…3
https://mcp.mailly.site/mcp

Menu names can differ slightly by plan and over time.

Your choice stays on this device in a cookie; no account needed.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

We have not read this server’s tool list yet; we check endpoints in rotation.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 7, 2026

  • ✓ Pass

    Maker matches the repo

    The registry name was verified against the domain mailly.site (the registry checks domain ownership)

  • … Not checked yet

    Still maintained

    We have not read this repo from GitHub yet

  • … Not checked yet

    Has a licence

    We have not read this repo from GitHub yet

  • … Not checked yet

    Endpoint responds

    Not checked yet; we check endpoints in rotation

  • … Not checked yet

    Sign-in with OAuth

    Not checked yet; we check endpoints in rotation

  • … Not checked yet

    No hidden instructions in tool descriptions

    Not checked yet; we read the tool list when we check the endpoint

Compared with others in Otheri

  • More stars than 0% of the other 32700 servers in this category
  • Published to the registry more recently than 65% of the other 32700 servers in this category
  • Basic checks equal to or better than 100% of the other 32700 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is Mailly safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs in the maker’s cloud. Connect over the internet with nothing to install, but what you send passes through the maker’s servers.

Is it still maintained?

The GitHub repo last changed –, and the latest version (0.3.1) reached the registry 21 days ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. It connects by URL, so apps that accept remote MCP servers work too, such as ChatGPT in developer mode.

What can I use instead?

In the same category: Spec Driven Development, Remote Desktop Commander, Agent Data Tools: Utilities

Alternatives

Servers in the same category from other makers, sorted by stars.

Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

Spec Driven Development

by formulahendry

MCP Server that facilitates spec-driven development workflows, not just Vibe Coding.

Runs on your computer★ 440MITUpdated 14 months ago
Install

Remote Desktop Commander

by desktop-commander

Remote Desktop Commander: use files, terminal and processes on your own computers from any AI app.

Runs in the cloud★ 211Updated 2 days ago
Install

README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

mailly-mcp

The MCP server behind Mailly's connector, plus the Mailly plugin for Claude and Codex.

  • src/: the MCP server, a Cloudflare Worker. It offers typed tools for Mailly mail, drafts, sending, domains, contacts, templates, campaigns, workflows and webhooks. Every tool calls the Mailly REST API with the caller's Mailly API key, so authentication, billing and workspace isolation all stay in the API.
  • ui/: the MCP Apps UI (email and draft cards), bundled into ui:// resources. It is off unless MCP_APPS=1.
  • plugins/mailly: the plugin for Claude (claude.ai, Cowork and Claude Code) and Codex. It points at the hosted server and adds a skill for working with email safely.
  • plugins/openai/mailly: the public ChatGPT/Codex update package, based on the published 0.3.1 release, with its existing listing, review cases, demo link, skill, and PNG icon retained.

Use the hosted server

Add https://mcp.mailly.site/mcp as a remote MCP server and sign in with your Mailly account (OAuth). In ChatGPT, add the published Mailly plugin. In Claude Code you can install the plugin instead:

/plugin install mailly --marketplace superagents-lab/mailly-mcp

This server is an OAuth protected resource. Mailly's API (https://api.mailly.site/api/auth) is the authorization server: clients find it through /.well-known/oauth-protected-resource, sign the user in there, and send the access token here. The server passes the token, or an API key, unchanged to Mailly's REST API, which checks it and the scopes it carries. The tool list is narrowed to the same scopes (GET /me).

Keep ChatGPT and Codex connections authorized

The public OpenAI configuration in plugins/openai/mailly/mcp.json and the Codex compatibility configuration in plugins/mailly/.codex-plugin/mcp.json request offline_access in extensions.com.openai.auth.baseScopes. Mailly issues a refresh token only when that scope is granted. Resource discovery and tool scopes describe Mailly data permissions; they do not request offline access on the client's behalf. Without it, sign-in succeeds but access ends when the one-hour access token expires.

For a published OpenAI plugin, upload the updated plugin package to the existing plugin, confirm that the saved MCP authentication settings include offline_access, then reconnect the account and rescan. Deploying the Worker alone does not update those saved settings. Reconnecting with the old settings will still produce a connection without a refresh token. For manually configured clients, include offline_access alongside the desired Mailly scopes when starting OAuth authorization.

Package the contents of plugins/openai/mailly as the upload root. Do not include the repository, marketplace, or the installed plugin's Portal-generated .app.json and apps binding in a public upload. Keep those generated bindings in the installed release; the submission portal owns them. The package version is 0.3.2. Separately, the Worker declares all three tool annotation booleans explicitly, including destructiveHint: false for read-only tools; that server update requires a Worker deployment and rescan. The MCP Registry listing is unchanged.

Run it yourself

npm install

npm run dev # wrangler dev on http://localhost:8787/mcp

Call /mcp with Authorization: Bearer (from https://mailly.site/app/developers). Without the MAILLY_API service binding it calls MAILLY_API_URL (default https://api.mailly.site) over the internet. To host your own copy, change the mcp.mailly.site route in wrangler.jsonc. OAuth sign-in only works at https://mcp.mailly.site/mcp, because Mailly issues tokens for that resource; elsewhere use an API key.

Develop

npm run typecheck

npm test # builds dist/worker.js and runs it in Miniflare against a stub API

The Mailly server repository runs its OAuth and end-to-end tests against dist/worker.js from a sibling checkout of this repository.

server.json is the listing in the MCP Registry as site.mailly/mcp. The site.mailly namespace is proven by a DNS TXT record on mailly.site, so publish with mcp-publisher login dns --domain mailly.site --private-key and mcp-publisher publish from a machine that holds the key. Bump version for each release.

License

MIT

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