Koskamo

MailboxValidator MCP

An MCP server that validates email addresses by checking syntax, DNS, MX servers, high-risk status, and whether the address is disposable or from a free provider. It supports both cloud-hosted and local deployment options.

Package and access

Local package with source-attributed installation metadata. Koskamo does not execute packages during review.

MailboxValidator MCP logo, by MailboxValidatorCommunity listingLocal stdioSource reviewed; not executedPublished by MailboxValidator
You need:This MCP server requires an API key.
Vendor documentation

Checks and signals

Each line is separate evidence, not a trust score.

  • Popularity 1 GitHub star

What you can do with it

  • Validate email syntax and deliverability
  • Check if an email is from a disposable provider
  • Identify free email providers

Source and maintenance

Community listingRegistry 1.0.0MIT
mcp-registry: io.github.MailboxValidator/mcp-mailboxvalidator@1.0.0Source repository
Last repository push
Latest release
v1.0.0
Maintenance checked

Packages and installation

Source-provided package data. Koskamo has not executed or live-probed this package.

mcp-mailboxvalidator 1.0.0

npm
mcp-mailboxvalidator package definition
{
  "version": "1.0.0",
  "transport": "stdio",
  "identifier": "mcp-mailboxvalidator",
  "registryType": "npm",
  "environmentVariables": [
    {
      "name": "MAILBOXVALIDATOR_API_KEY",
      "format": "string",
      "isRequired": true,
      "description": "Your MailboxValidator API key."
    }
  ]
}

Tools

Reported by the attributed source; not independently observed by Koskamo.

No tool definitions available.

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

  • · repository · passed · metadata changed · updated
  • · backfill · recorded · Pre-expansion baseline; unobserved rich metadata remains unknown

Connect from your client

Each snippet configures the same source-provided package; replace placeholders before use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Cursor

Merge this local stdio configuration, replace every placeholder environment value, and restart Cursor. Koskamo has not executed this package.
Cursor configuration
{
  "mcpServers": {
    "mailboxvalidator-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-mailboxvalidator@1.0.0"
      ],
      "env": {
        "MAILBOXVALIDATOR_API_KEY": "<YOUR_MAILBOXVALIDATOR_API_KEY>"
      }
    }
  }
}

Cline

Merge this local stdio configuration, replace every placeholder environment value, and restart Cline. Koskamo has not executed this package.
Cline configuration
{
  "mcpServers": {
    "mailboxvalidator-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-mailboxvalidator@1.0.0"
      ],
      "env": {
        "MAILBOXVALIDATOR_API_KEY": "<YOUR_MAILBOXVALIDATOR_API_KEY>"
      }
    }
  }
}

VS Code

Merge this local stdio configuration, replace every placeholder environment value, and restart VS Code. Koskamo has not executed this package.
VS Code configuration
{
  "servers": {
    "mailboxvalidator-mcp": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "mcp-mailboxvalidator@1.0.0"
      ],
      "env": {
        "MAILBOXVALIDATOR_API_KEY": "<YOUR_MAILBOXVALIDATOR_API_KEY>"
      }
    }
  }
}

Claude Desktop

Merge this local stdio configuration, replace every placeholder environment value, and restart Claude Desktop. Koskamo has not executed this package.
Claude Desktop configuration
{
  "mcpServers": {
    "mailboxvalidator-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-mailboxvalidator@1.0.0"
      ],
      "env": {
        "MAILBOXVALIDATOR_API_KEY": "<YOUR_MAILBOXVALIDATOR_API_KEY>"
      }
    }
  }
}

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