MailboxValidator

About MailboxValidator

Use MailboxValidator with your agent

claude mcp add mailboxvalidator -- npx -y mcp-mailboxvalidator

{
  "mcpServers": {
    "mailboxvalidator": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-mailboxvalidator"
      ]
    }
  }
}

Frequently asked questions

What is MailboxValidator?

MailboxValidator is an MCP (Model Context Protocol) server by mailboxvalidator in the Communication category. Email validation MCP server using the MailboxValidator API. It can validate email addresses.

How do I connect MailboxValidator to Claude, Cursor, or another MCP client?

Install MailboxValidator from its npm package (mcp-mailboxvalidator) and register it under "mcpServers" in your client's MCP configuration — for example claude_desktop_config.json or Cursor's mcp.json — then restart the client.

Is MailboxValidator open source?

Yes — the source code is public at github.com/mailboxvalidator/mcp-mailboxvalidator.

Can AI agents pay to use MailboxValidator?

Not yet through Loomal — MailboxValidator is listed as a free directory entry. If its maintainer verifies ownership, they can set per-call USDC pricing that agents pay over x402, with settlement on Base.