Maildev MCP

Name: Maildev MCP
Author: pierre3

by pierre3version 1.0.1i★ –iRuns on your computer

Registry nameio.github.pierre3/maildev-mcp

Install

Overview

Description from the maker (original English)

MailDev MCP server. Manage Docker containers and inspect emails from your AI editor or MCP client.

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: Developer tools

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: MAILDEV_API_PORT

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": {
    "maildev": {
      "command": "dnx",
      "args": [
        "MailDevMcp",
        "--yes"
      ],
      "env": {
        "MAILDEV_API_PORT": "your-value"
      }
    }
  }
}

Run this in your terminal

claude mcp add maildev --env MAILDEV_API_PORT=your-value -- dnx MailDevMcp --yes

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": {
    "maildev": {
      "command": "dnx",
      "args": [
        "MailDevMcp",
        "--yes"
      ],
      "env": {
        "MAILDEV_API_PORT": "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": {
    "maildev": {
      "type": "stdio",
      "command": "dnx",
      "args": [
        "MailDevMcp",
        "--yes"
      ],
      "env": {
        "MAILDEV_API_PORT": "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

MAILDEV_API_PORT env
Port number for the MailDev REST API (default: 1080)

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 7, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account pierre3, 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 Developer toolsi

More stars than 0% of the other 1395 servers in this category
Published to the registry more recently than 10% of the other 1395 servers in this category
Basic checks equal to or better than 100% of the other 1395 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 Maildev MCP 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 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 (1.0.1) reached the registry 8 months ago.

Which apps can use it?

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

What can I use instead?

In the same category: GitHub, Desktop Commander, Cloudflare MCP

Alternatives

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

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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.

MailDevMcp

English | 日本語

mcp-name: io.github.pierre3/maildev-mcp

An MCP (Model Context Protocol) server for MailDev. Manage MailDev Docker containers and inspect received emails directly from your AI-powered editor or MCP client.

This server is intended for local development and test automation scenarios where an MCP client needs to:

start or stop a MailDev container
inspect inbox contents
wait for emails after triggering application behavior
inspect HTML bodies and attachments
verify attachment integrity byte-for-byte

Installation

Install as a global .NET tool:

dotnet tool install -g MailDevMcp

After installation, the maildev-mcp command becomes available.

MCP Client Configuration

Add the following to your MCP client settings (e.g. Claude Desktop, VS Code, etc.):

"mcpServers": { "maildev-mcp": { "command": "maildev-mcp", "env": { "MAILDEV_API_PORT": "1080" } } } }

Environment Variables

Variable	Default	Description
`MAILDEV_API_PORT`	`1080`	Port number for the MailDev REST API

Typical Workflow

Call StartMaildev to launch a local MailDev container
Trigger your application to send an email
Call WaitForEmail if delivery is asynchronous
Use ListEmails, SearchEmails, or GetEmail to inspect the result
Use GetEmailHtml, GetAttachmentContent, or VerifyAttachment when deeper validation is needed
Clean up with DeleteEmail, DeleteAllEmails, or StopMaildev

Available Tools

Tool	Description
`StartMaildev`	Start the MailDev Docker container with configurable SMTP port, API port, authentication, and TLS
`StopMaildev`	Stop and remove the MailDev Docker container
`MaildevStatus`	Check the running status of MailDev
`ListEmails`	Retrieve the list of received emails
`GetEmail`	Get the details of an email by ID, including attachment information
`GetEmailHtml`	Get the HTML body of an email by ID
`SearchEmails`	Search received emails by subject, sender, or recipient
`DeleteEmail`	Delete a single email by ID
`DeleteAllEmails`	Delete all received emails
`WaitForEmail`	Wait until a new email matching given criteria arrives (useful for test automation)
`GetAttachmentContent`	Get the raw Base64-encoded content of an email attachment
`VerifyAttachment`	Verify that an email attachment matches the original data by byte-by-byte comparison

Tool Behavior Notes

StartMaildev
Supports custom SMTP and API ports
Supports optional SMTP authentication
Treats empty or whitespace-only credentials as authentication disabled
Supports TLS with a generated self-signed certificate
GetEmail and ListEmails
Render missing or empty subjects as (no subject)
Render missing address lists as (none)
WaitForEmail
Polls MailDev until a matching email arrives or the timeout is reached
Reports transient MailDev connection failures in the returned message when they occur during polling
VerifyAttachment
Accepts a Base64-encoded original payload
Compares the received attachment byte-by-byte
Reports either exact match, size mismatch, or content mismatch

Requirements and Assumptions

Docker must be installed and available on the same machine where this MCP server runs
MailDev is accessed through its HTTP API on localhost
The configured API port in the MCP client must match the MailDev API port exposed by Docker

Prerequisites

.NET 10 SDK or later
Docker (for running the MailDev container)

Building from Source

git clone https://github.com/pierre3/MailDevMcp.git

cd MailDevMcp dotnet pack -c Release dotnet tool install -g --add-source ./bin/Release MailDevMcp

## License

MIT

Maildev MCP

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 Developer toolsi

Common questions

Alternatives

GitHub

Desktop Commander

Cloudflare MCP

README from the maker

MailDevMcp

Installation

MCP Client Configuration

Environment Variables

Typical Workflow

Available Tools

Tool Behavior Notes

Requirements and Assumptions

Prerequisites

Building from Source