SignupBouncer

{
  "mcpServers": {
    "com.signupbouncer/checker": {
      "url": "https://signupbouncer.com/mcp"
    }
  }
}

Indexed tools

Tool metadata and schemas come from the remote server and are untrusted. Indexing only lists tools; it never calls them.

6 shown · authentication unknown

• Check a signup email (and IP)

  check_email

  Checks one email address, and optionally the signup's IP address, the way SignupBouncer checks a new signup. Returns the result as "verdict" (allow, challenge or block), a 0-100 score, the reasons with their reason codes, the normalised inbox (Gmail dots and +tags folded) and the IP's network. When the domain looks like a typo of a big mail provider (gmial.com), "suggestion" holds the corrected address. Looks up the domain's mail servers live. Every reason is listed, including ones only paid plans count. Nothing sent is stored.

  Schema valid · SHA-256 4fbb6dc65144…

  View input schema

  {
    "type": "object",
    "properties": {
      "email": {
        "type": "string",
        "description": "The email address to check.",
        "maxLength": 320
      },
      "ip": {
        "type": "string",
        "description": "Optional IPv4 or IPv6 address the signup came from.",
        "maxLength": 64
      }
    },
    "required": [
      "email"
    ],
    "additionalProperties": false
  }

• Explain a reason code

  explain_reason

  Explains a SignupBouncer reason code (for example disposable_domain, burner_mx, repeat_inbox, datacenter_ip): what it means, how many points it adds or whether it blocks alone, and the lowest plan on which it counts. Without a code, lists every code.

  Schema valid · SHA-256 8337b6ad587d…

  View input schema

  {
    "type": "object",
    "properties": {
      "code": {
        "type": "string",
        "description": "A reason code such as disposable_domain. Omit to list all codes."
      }
    },
    "additionalProperties": false
  }