MailboxValidator MCP Server

by mailboxvalidatorio.github.MailboxValidator/mcp-mailboxvalidatorv1.0.0

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

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Install MailboxValidator MCP server

claude mcp add mailboxvalidator -e MAILBOXVALIDATOR_API_KEY='<mailboxvalidator-api-key>' -- npx -y mcp-mailboxvalidator

{
  "mcpServers": {
    "mailboxvalidator": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-mailboxvalidator"
      ],
      "env": {
        "MAILBOXVALIDATOR_API_KEY": "<mailboxvalidator-api-key>"
      }
    }
  }
}

Add to ~/.cursor/mcp.json (global) or .cursor/mcp.json (project).

{
  "mcpServers": {
    "mailboxvalidator": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-mailboxvalidator"
      ],
      "env": {
        "MAILBOXVALIDATOR_API_KEY": "<mailboxvalidator-api-key>"
      }
    }
  }
}

Settings → Developer → Edit Config (claude_desktop_config.json), then restart.

{
  "servers": {
    "mailboxvalidator": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "mcp-mailboxvalidator"
      ],
      "env": {
        "MAILBOXVALIDATOR_API_KEY": "<mailboxvalidator-api-key>"
      }
    }
  }
}

Add to .vscode/mcp.json in your workspace.

{
  "mcpServers": {
    "mailboxvalidator": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-mailboxvalidator"
      ],
      "env": {
        "MAILBOXVALIDATOR_API_KEY": "<mailboxvalidator-api-key>"
      }
    }
  }
}

Add to ~/.codeium/windsurf/mcp_config.json.

Configuration

Variable	Required	Secret	Description
MAILBOXVALIDATOR_API_KEY	yes	yes	Your MailboxValidator API key.

Freshness

Slowing — last maintenance signal 4mo ago. The newest of the signals below sets the band.

Last commit (default branch)
2026-06-03 · 4mo ago · GitHub
Latest release
2026-04-09 · 6mo ago · GitHub · v1.0.0
Package published
no data · npm/PyPI
Registry entry updated
2026-05-28 · 5mo ago · official registry · v1.0.0

FAQ

›How do I install the MailboxValidator MCP server in Claude Code?

Run: claude mcp add mailboxvalidator -e MAILBOXVALIDATOR_API_KEY='<mailboxvalidator-api-key>' -- npx -y mcp-mailboxvalidator. For Cursor, VS Code, Claude Desktop and Windsurf, use the install tabs above.

›Does MailboxValidator require an API key?

Yes. It expects MAILBOXVALIDATOR_API_KEY, of which 1 is a secret.

›Can I use MailboxValidator as a remote (hosted) MCP server?

No hosted endpoint is published; it runs locally over stdio.

›Is MailboxValidator in the official MCP registry?

Yes, as io.github.MailboxValidator/mcp-mailboxvalidator.