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:

config.json

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

Restart Claude Desktop.

Claude Code

Terminal

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:

config.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