Is io.github.MailboxValidator/mcp-mailboxvalidator safe to use?

io.github.MailboxValidator/mcp-mailboxvalidator has no known CVEs as of the latest MCPpedia security scan. It does not require authentication, so any local process can connect — keep this in mind in shared environments.

How do I install io.github.MailboxValidator/mcp-mailboxvalidator?

io.github.MailboxValidator/mcp-mailboxvalidator supports copy-paste install configs on its MCPpedia page for Claude Desktop, Cursor, and Claude Code. Scroll to the Quick Install section and select your client.

What AI clients work with io.github.MailboxValidator/mcp-mailboxvalidator?

io.github.MailboxValidator/mcp-mailboxvalidator is compatible with claude-desktop, cursor, claude-code. It uses stdio and sse and http transport.

Is io.github.MailboxValidator/mcp-mailboxvalidator actively maintained?

io.github.MailboxValidator/mcp-mailboxvalidator is actively maintained — last commit was 28 days ago.

io.github.MailboxValidator/mcp-mailboxvalidator

npm

Email validation MCP server using the MailboxValidator API. It can validate email addresses.

14.9M/wk GitHub npm

No known CVEs

No license

Actively maintained

Last commit 28d ago

Works with most clients

Transport: stdio, sse, http

0 tools

Grade F

Edit this pageView history

Communication

Step 1

Install in your client

Config is the same across clients — only the file and path differ.

Supported in Claude Desktopstdio, sse, http · Node 18+

Paste into ~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "mailboxvalidator": {
      "env": {
        "MAILBOXVALIDATOR_API_KEY": "<YOUR_API_KEY>"
      },
      "args": [
        "C:\\path\\to\\mcp-mailboxvalidator\\build\\index.js"
      ],
      "command": "node"
    }
  }
}

Are you the author?

Add this badge to your README to show your security score and help users find safe servers.

Embed in your READMEAbout badges →

[![MCPpedia Score](https://mcppedia.org/api/badge/io-github-mailboxvalidator-mcp-mailboxvalidator)](https://mcppedia.org/s/io-github-mailboxvalidator-mcp-mailboxvalidator)

Read me

What io.github.MailboxValidator/mcp-mailboxvalidator does

This is a simple Model Context Protocol (MCP) server implementation for MailboxValidator API. It will return validation result for an email address.

Test This Server

Run this in your terminal to verify the server starts. Then let us know if it worked — your result helps other developers.

npx -y 'npm' 2>&1 | head -1 && echo "✓ Server started successfully"

After testing, let us know if it worked:

Loading README…

Scored, not listed

Why this score

Five weighted categories — click any category to see the underlying evidence.

Score breakdown

58/100across 5 weighted dimensions

How we score →

0255075100

−42

Security

Maintenance

Efficiency

Documentation

Compatibility

Categoriesclick a row to see evidence

Security

OSV.dev

8 fixed

CVE-2022-29244high · fixedCVSS 7.5

Packing does not respect root-level ignore files in workspaces

### Impact `npm pack` ignores root-level `.gitignore` & `.npmignore` file exclusion directives when run in a workspace or with a workspace flag (ie. `--workspaces`, `--workspace=<name>`). Anyone who has run `npm pack` or `npm publish` with workspaces, as of [v7.9.0](https://github.com/npm/cli/releases/tag/v7.9.0) & [v7.13.0](https://github.com/npm/cli/releases/tag/v7.13.0) respectively, may be affected and have published files into the npm registry they did not intend to include. ### Patch - Up

Affected: >= 7.9.0Fixed in 8.11.0source →

CVE-2018-7408high · fixedCVSS 7.8

Incorrect Permission Assignment for Critical Resource in NPM

An issue was discovered in an npm 5.7.0 2018-02-21 pre-release (marked as "next: 5.7.0" and therefore automatically installed by an "npm upgrade -g npm" command, and also announced in the vendor's blog without mention of pre-release status). It might allow local users to bypass intended filesystem access restrictions because ownerships of /etc and /usr directories are being changed unexpectedly, related to a "correctMkdir" issue.

Affected: >= 0Fixed in 5.7.1source →

CVE-2013-4116info · fixed

Local Privilege Escalation in npm

Affected versions of `npm` use predictable temporary file names during archive unpacking. If an attacker can create a symbolic link at the location of one of these temporary file names, the attacker can arbitrarily write to any file that the user which owns the `npm` process has permission to write to, potentially resulting in local privilege escalation. ## Recommendation Update to version 1.3.3 or later.

Affected: >= 0Fixed in 1.3.3source →

CVE-2020-15095medium · fixedCVSS 4.4

npm CLI exposing sensitive information through logs

Versions of the npm CLI prior to 6.14.6 are vulnerable to an information exposure vulnerability through log files. The CLI supports URLs like `<protocol>://[<user>[:<password>]@]<hostname>[:<port>][:][/]<path>`. The password value is not redacted and is printed to stdout and also to any generated log files.

Affected: >= 0Fixed in 6.14.6source →

CVE-2019-16777high · fixedCVSS 7.7

npm Vulnerable to Global node_modules Binary Overwrite

Versions of the npm CLI prior to 6.13.4 are vulnerable to a Global node_modules Binary Overwrite. It fails to prevent existing globally-installed binaries to be overwritten by other package installations. For example, if a package was installed globally and created a `serve` binary, any subsequent installs of packages that also create a `serve` binary would overwrite the first binary. This will not overwrite system binaries but only binaries put into the global node_modules directory. This b

Affected: >= 0Fixed in 6.13.4source →

Community

Reviews

Be the first to review

Have you used this server?

Share your experience — it helps other developers decide.

How easy was setup?Did it work reliably?How was the documentation?

Frequently Asked Questions

Is io.github.MailboxValidator/mcp-mailboxvalidator safe to use?: io.github.MailboxValidator/mcp-mailboxvalidator has no known CVEs as of the latest MCPpedia security scan. It does not require authentication, so any local process can connect — keep this in mind in shared environments.
How do I install io.github.MailboxValidator/mcp-mailboxvalidator?: io.github.MailboxValidator/mcp-mailboxvalidator supports copy-paste install configs on its MCPpedia page for Claude Desktop, Cursor, and Claude Code. Scroll to the Quick Install section and select your client.
What AI clients work with io.github.MailboxValidator/mcp-mailboxvalidator?: io.github.MailboxValidator/mcp-mailboxvalidator is compatible with claude-desktop, cursor, claude-code. It uses stdio and sse and http transport.
Is io.github.MailboxValidator/mcp-mailboxvalidator actively maintained?: io.github.MailboxValidator/mcp-mailboxvalidator is actively maintained — last commit was 28 days ago.

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Community

Discussion

Start a conversation

Ask a question, share a tip, or report an issue.

Has anyone used this with Cursor?How do you handle auth?Any alternatives?

Edit this pageView history

Communication

Step 1

Install in your client

Config is the same across clients — only the file and path differ.

Supported in Claude Desktopstdio, sse, http · Node 18+

Paste into ~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "mailboxvalidator": {
      "env": {
        "MAILBOXVALIDATOR_API_KEY": "<YOUR_API_KEY>"
      },
      "args": [
        "C:\\path\\to\\mcp-mailboxvalidator\\build\\index.js"
      ],
      "command": "node"
    }
  }
}

Are you the author?

Add this badge to your README to show your security score and help users find safe servers.

Embed in your READMEAbout badges →

[![MCPpedia Score](https://mcppedia.org/api/badge/io-github-mailboxvalidator-mcp-mailboxvalidator)](https://mcppedia.org/s/io-github-mailboxvalidator-mcp-mailboxvalidator)

Read me

What io.github.MailboxValidator/mcp-mailboxvalidator does

This is a simple Model Context Protocol (MCP) server implementation for MailboxValidator API. It will return validation result for an email address.

Test This Server

Run this in your terminal to verify the server starts. Then let us know if it worked — your result helps other developers.

npx -y 'npm' 2>&1 | head -1 && echo "✓ Server started successfully"

After testing, let us know if it worked:

README

MailboxValidator MCP server

This is a simple Model Context Protocol (MCP) server implementation for MailboxValidator API. It will return validation result for an email address.

Features

Comprehensive Email Validation: Checking an email address to see if an email is reachable by checking the syntax, DNS, MX server, high risk, suppressed list, and more.
Disposable Email: Checking an email address to see if it's from a temporary/disposable email provider.
Free Email: Checking an email address to see if it's from a free email provider.

Requirement

This MCP server requires an API key. You can also sign up for a free API key and enjoy up to 300 queries per month.

The setup also uses Node.js and npm, which can be downloaded at Node.js website.

Setup

Follow the steps to use this MCP server with Claude Desktop:

Download the repository to your local.
Run the following commands while inside the project folder to install dependencies and build the server.

npm install
npm run build

Make sure you have installed Claude Desktop. If you haven't, kindly download from here for Windows and macOS users, or follow this guide for Linux users.
Open claude_desktop_config.json. If you don't have that file yet, follow this guide to create one.
Add the following to your claude_desktop_config.json:

{
  "mcpServers": {
    "mailboxvalidator": {
      "command": "node",
      "args": [
        "C:\\path\\to\\mcp-mailboxvalidator\\build\\index.js"
      ],
      "env": {
        "MAILBOXVALIDATOR_API_KEY": "<YOUR_API_KEY>"
      }
    }
  }
}

Remember to replace the path for the index.js with your actual path to your MailboxValidator MCP server on your local machine.
To get your API key, just login to your dashboard and get it from there. Replace the <YOUR_API_KEY> in the above with your actual API key.
Restart the Claude Desktop after saving the changes, and you should see it appear in the Search and tools menu.

Usage

Just enter your query about the email address in a chat in Claude Desktop. Some of example queries are:

Is (email) a valid email address?
Is (email) a fake email?
Is (email) a free email?

In Claude Desktop, the model will automatically generate the output based on the result returned by MailboxValidator MCP server.

Environment Variable

MAILBOXVALIDATOR_API_KEY

The free MailboxValidator API key allows you to query up to 300 emails per month. If you require more, you can sign up for a paid API plan.

Tool

validate_email

Description Validates the email address given. It helps users to determine if an email address is potentially reachable by checking the syntax, DNS, MX server, disposable list and more.

Arguments email (str): The email address to validate.

Returns A JSON string containing the validation data. The result includes the following fields:

Syntax: Checks that the email address conforms to how an email address should look like.
DNS & MX Server: Checks that the domain DNS has an MX server specified.
Network & Connectivity: Attempts connection to the MX server to make sure it's operational.
Greylisting: Checks if MX server is using greylisting that could cause email sent to that address to bounce.
Disposable List: Checks if the email domain is from a temporary or disposable email provider

... View full README on GitHub

Loading README…

Scored, not listed

Why this score

Five weighted categories — click any category to see the underlying evidence.

Score breakdown

58/100across 5 weighted dimensions

How we score →

0255075100

−42

Security

Maintenance

Efficiency

Documentation

Compatibility

Categoriesclick a row to see evidence

Security

OSV.dev

8 fixed

CVE-2022-29244high · fixedCVSS 7.5

Packing does not respect root-level ignore files in workspaces

Affected: >= 7.9.0Fixed in 8.11.0source →

CVE-2018-7408high · fixedCVSS 7.8

Incorrect Permission Assignment for Critical Resource in NPM

Affected: >= 0Fixed in 5.7.1source →

CVE-2013-4116info · fixed

Local Privilege Escalation in npm

Affected: >= 0Fixed in 1.3.3source →

CVE-2020-15095medium · fixedCVSS 4.4

npm CLI exposing sensitive information through logs

Affected: >= 0Fixed in 6.14.6source →

CVE-2019-16777high · fixedCVSS 7.7

npm Vulnerable to Global node_modules Binary Overwrite

Affected: >= 0Fixed in 6.13.4source →

Community

Reviews

Be the first to review

Have you used this server?

Share your experience — it helps other developers decide.

How easy was setup?Did it work reliably?How was the documentation?

Frequently Asked Questions

Is io.github.MailboxValidator/mcp-mailboxvalidator safe to use?: io.github.MailboxValidator/mcp-mailboxvalidator has no known CVEs as of the latest MCPpedia security scan. It does not require authentication, so any local process can connect — keep this in mind in shared environments.
How do I install io.github.MailboxValidator/mcp-mailboxvalidator?: io.github.MailboxValidator/mcp-mailboxvalidator supports copy-paste install configs on its MCPpedia page for Claude Desktop, Cursor, and Claude Code. Scroll to the Quick Install section and select your client.
What AI clients work with io.github.MailboxValidator/mcp-mailboxvalidator?: io.github.MailboxValidator/mcp-mailboxvalidator is compatible with claude-desktop, cursor, claude-code. It uses stdio and sse and http transport.
Is io.github.MailboxValidator/mcp-mailboxvalidator actively maintained?: io.github.MailboxValidator/mcp-mailboxvalidator is actively maintained — last commit was 28 days ago.