How do I install Smtping?

Smtping is a local plugin. Install it using npm package: @smtping/mcp and add the generated configuration snippet to your AI app's MCP config file. Then restart your AI app.

What credentials does Smtping need?

Smtping requires the following credentials or environment variables: SMTPING_API_KEY. You can find setup instructions on the server detail page.

What AI apps work with Smtping?

Smtping uses the Model Context Protocol (MCP) and works with any MCP-compatible AI app, including Claude, ChatGPT / Codex, Gemini, Copilot, Cursor, and more.

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Smtping MCP Server

by Smtping

Developer ToolsScan in ProgressMCP RegistryLocal

Free

Server data from the Official MCP Registry

Verify email addresses, clean lists and check spamtrap, disposable, spambot and complainer lists.

About

Verify email addresses, clean lists and check spamtrap, disposable, spambot and complainer lists.

Security Report

0.0

Use Caution0.0Moderate Risk

5 tools verified · Open access · No issues found

Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.

Remote servers are capped at 8.0 because source code is not available for review. The score reflects endpoint verification only.

What You'll Need

Set these up before or after installing:

Your SMTPing API key, from https://app.smtping.comRequired

Environment variable: SMTPING_API_KEY

How to Install

Add this to your MCP configuration file:

{
  "mcpServers": {
    "io-github-smtping-smtping-mcp": {
      "env": {
        "SMTPING_API_KEY": "your-smtping-api-key-here"
      },
      "args": [
        "-y",
        "@smtping/mcp"
      ],
      "command": "npx"
    }
  }
}

Documentation

View on GitHub

From the project's GitHub README.

SMTPing MCP server

Official Model Context Protocol server for SMTPing. It lets Claude, Cursor, VS Code, Windsurf and any MCP client verify email addresses in a conversation.

"Verify these 40 leads and tell me which ones are safe to email."

Tools

tool	what it does	credits
`verify_email`	Verifies one address: status plus band (safe, avoid, judgement)	1
`verify_list`	Verifies a list as one bulk job (up to 100,000), waits for results	1 per unique address
`get_bulk_job`	Progress and results of a bulk job	0
`check_threat`	Looks up one address in the spamtrap, disposable, spambot or complainer list	1
`get_credits`	Remaining credits and plan	0

Setup

Create an API key in the SMTPing dashboard, then add the server to your client. Node 18 or later is required.

Claude Desktop

Settings > Developer > Edit Config, then add to claude_desktop_config.json:

{
  "mcpServers": {
    "smtping": {
      "command": "npx",
      "args": ["-y", "@smtping/mcp"],
      "env": { "SMTPING_API_KEY": "sk_live_your_key_here" }
    }
  }
}

Restart Claude Desktop.

Claude Code

claude mcp add smtping -e SMTPING_API_KEY=sk_live_your_key_here -- npx -y @smtping/mcp

Cursor

~/.cursor/mcp.json (or .cursor/mcp.json in a project): same JSON block as Claude Desktop.

VS Code

.vscode/mcp.json:

{
  "servers": {
    "smtping": {
      "command": "npx",
      "args": ["-y", "@smtping/mcp"],
      "env": { "SMTPING_API_KEY": "sk_live_your_key_here" }
    }
  }
}

Windows

If npx is not found, use "command": "cmd" and "args": ["/c", "npx", "-y", "@smtping/mcp"].

Privacy

Addresses are sent to the SMTPing API only when a tool is called. See the privacy policy.

Links

MIT License

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