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SMTPing Email Verification

Official registry Productivity

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

Source code Website Documentation

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

Remote (streamable-http)
Claude Code 
claude mcp add --transport http smtping-email-verification 'https://mcp.smtping.com/mcp'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "smtping-email-verification": {
            "type": "http",
            "url": "https://mcp.smtping.com/mcp"
        }
    }
}
NPM package @smtping/mcp
Claude Code 
claude mcp add smtping-email-verification -e 'SMTPING_API_KEY=<your smtping_api_key>' -- npx -y @smtping/mcp@1.0.1
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "smtping-email-verification": {
            "command": "npx",
            "args": [
                "-y",
                "@smtping/mcp@1.0.1"
            ],
            "env": {
                "SMTPING_API_KEY": "<your smtping_api_key>"
            }
        }
    }
}

Environment variables

  • SMTPING_API_KEY required secret Your SMTPing API key, from https://app.smtping.com

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

Contents
  1. SMTPing MCP server
  2. Tools
  3. Setup
  4. Privacy
  5. Links

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

toolwhat it doescredits
verify_emailVerifies one address: status plus band (safe, avoid, judgement)1
verify_listVerifies a list as one bulk job (up to 100,000), waits for results1 per unique address
get_bulk_jobProgress and results of a bulk job0
check_threatLooks up one address in the spamtrap, disposable, spambot or complainer list1
get_creditsRemaining credits and plan0

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 troubleshooting

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

"Request timed out" or "Server disconnected" on first start: the first npx run downloads the package and can take longer than the client's 60 second startup limit. Install the server once, then point the client to it:

  1. In a terminal: npm install -g @smtping/mcp
  2. Replace the smtping block with:
"smtping": {
  "command": "node",
  "args": ["C:\\Users\\YOUR_NAME\\AppData\\Roaming\\npm\\node_modules\\@smtping\\mcp\\index.js"],
  "env": { "SMTPING_API_KEY": "sk_live_your_key_here" }
}

Replace YOUR_NAME with your Windows user folder (spaces are fine) and use double backslashes. Run echo %APPDATA% to see the exact path. This form also avoids issues with .cmd launchers when the user folder contains a space.

  1. Quit the client completely (tray icon > Quit) and reopen it.

To update later: npm install -g @smtping/mcp@latest.

Logs: Claude Desktop writes them to %APPDATA%\Claude\logs\mcp-server-smtping.log.

Privacy

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

MIT License

Frequently asked questions

What is SMTPing Email Verification?

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

How do I install SMTPing Email Verification?

It runs as a remote server. In Claude Code: claude mcp add --transport http smtping-email-verification 'https://mcp.smtping.com/mcp'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does SMTPing Email Verification need an API key?

Yes. It expects SMTPING_API_KEY, which you set in its configuration.

Is SMTPing Email Verification open source?

Yes. Its code is on GitHub under the MIT license.

Who maintains SMTPing Email Verification?

It is published by smtping. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.