MailFlat

Name: MailFlat
Author: MailFlat

by MailFlatversion 0.9.2i★ –iRuns on your computer

Registry nameio.github.MailFlat/mailflat-mcp

Install

Overview

Description from the maker (original English)

Real email inboxes for AI agents: open an address, read the one-time code, send mail.

PopNx MCP’s three pillars

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

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

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.

Connection: Runs on your computer
Transport: stdio
Category: Chat & email
You need to fill in: MAILFLAT_API_KEY

Install

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

Before you install

Basic checks: 1 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
You fill in yourself: MAILFLAT_API_KEY, MAILFLAT_API_URL

Values marked secret are keys to your account. Never share them or paste them into a chat.

You need

PyPIPython’s uv installed (for the uvx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

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

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "mailflat": {
      "command": "uvx",
      "args": [
        "mailflat-mcp"
      ],
      "env": {
        "MAILFLAT_API_KEY": "your-value",
        "MAILFLAT_API_URL": "your-value"
      }
    }
  }
}

Run this in your terminal

claude mcp add mailflat --env MAILFLAT_API_KEY=your-value --env MAILFLAT_API_URL=your-value -- uvx mailflat-mcp

Fill in the empty values before running it.

Open in Cursor

Or copy the settings yourself

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

{
  "mcpServers": {
    "mailflat": {
      "command": "uvx",
      "args": [
        "mailflat-mcp"
      ],
      "env": {
        "MAILFLAT_API_KEY": "your-value",
        "MAILFLAT_API_URL": "your-value"
      }
    }
  }
}

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": {
    "mailflat": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "mailflat-mcp"
      ],
      "env": {
        "MAILFLAT_API_KEY": "your-value",
        "MAILFLAT_API_URL": "your-value"
      }
    }
  }
}

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.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

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

Values you fill in

MAILFLAT_API_KEY secret required env
MailFlat API key. Create one in the dashboard under Agents.
MAILFLAT_API_URL env
Override the API base URL. Defaults to https://mailflat.net.

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

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

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 6, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account MailFlat, which owns the repo
… 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 applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Chat & emaili

More stars than 0% of the other 1765 servers in this category
Published to the registry more recently than 27% of the other 1765 servers in this category
Basic checks equal to or better than 100% of the other 1765 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 MailFlat 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?

You need to fill in: MAILFLAT_API_KEY

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (0.9.2) reached the registry 2 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Python (uv) on your computer.

What can I use instead?

In the same category: Vexa, emailmd, MCP WhatsApp Cloud

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

Vexa

by Vexa-ai

Meeting bot and transcripts for Google Meet, Teams and Zoom. Live or after, speakers labelled.

Runs in the cloud★ 2,949Apache-2.0Updated 2 months ago

Install

emailmd

by anypost

Render markdown into email-safe HTML, lint drafts for deliverability problems, and preview emails.

Computer or cloud★ 1,385MITUpdated 31 days ago

Install

MCP WhatsApp Cloud

by codespar

MCP server for WhatsApp Cloud API (Meta) — messages, media, and templates via Graph API

Runs on your computer★ 277MITUpdated 5 months 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.

MailFlat SDKs

Official client libraries for MailFlat: email inboxes your code owns, with one-line OTP retrieval. Built for test suites (Selenium, pytest, Playwright) and AI agents.

Addresses are permanent, so a suite does not need a fresh one per run. Only the messages expire, on a retention window you choose.

This repo holds only the open-source SDKs. The MailFlat service itself is closed-source.

Packages

Package	For	Install
`mailflat`	Python	`pip install mailflat`
`@mailflat/sdk`	JavaScript / TypeScript	`npm i @mailflat/sdk`
`mailflat-mcp`	AI assistants (Claude, Cursor) — MCP	`uvx mailflat-mcp`
`@mailflat/ai-sdk`	Vercel AI SDK agents	`npm i @mailflat/ai-sdk`
`mailflat.langchain`	LangChain agents	`pip install "mailflat[langchain]"`
`mailflat-sdk` (Java)	Java / Selenium	via JitPack — see below

Each client is a thin, typed wrapper over the same /api/v1 Agent API, so they behave identically. Authenticate with your account key (mf_live_…) from the dashboard (Agents → API keys).

Java / Selenium (JitPack)

JitPack derives the groupId from the GitHub owner. This repo moved to the official

MailFlat account in August 2026, so releases from v0.4.4 on publish as

com.github.MailFlat:mailflat-sdks. Earlier versions still resolve under the old

coordinate com.github.onderyentar21:mailflat-sdks; the old repo stays up for them.

The client is moving to Maven Central (net.mailflat) next, which ends the owner coupling.

<repositories>

jitpack.io https://jitpack.io

com.github.MailFlat mailflat-sdks v0.8.1

MailFlat mf = new MailFlat("mf_live_…");

Inbox inbox = mf.create("signup"); driver.findElement(By.id("email")).sendKeys(inbox.address()); String otp = inbox.waitForOtp(30); // polls until the code arrives driver.findElement(By.id("code")).sendKeys(otp);

Quick examples

Python

from mailflat import MailFlat

mf = MailFlat(api_key="mf_live_…") inbox = mf.create(label="signup") otp = inbox.wait_for_otp(timeout=30)

JavaScript / TypeScript

import { MailFlat } from "@mailflat/sdk";

const mf = new MailFlat({ apiKey: process.env.MAILFLAT_API_KEY }); const inbox = await mf.create({ label: "signup" }); const otp = await inbox.waitForOtp({ timeout: 30000 });

License

MIT. The full text is in LICENSE at the repository root; each package directory carries an identical copy.

MailFlat

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

Values you fill in

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Chat & emaili

Common questions

Alternatives

Vexa

emailmd

MCP WhatsApp Cloud

README from the maker

MailFlat SDKs

Packages

Java / Selenium (JitPack)

Quick examples

License