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NoBounce Email Validation

Official registry Productivity

Real-time single and bulk email validation (syntax, MX, 5,000+ disposable domains, SMTP).

Source code Documentation

What can you do with NoBounce Email Validation?

  • validate_email — Validate a single email address (email, optional smtp_check).
  • validate_emails_bulk — Validate an array of up to 1,000 email addresses (emails, optional smtp_check).

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 nobounce-email-validation 'https://nobounceapi.com/mcp' --header 'X-API-Key: <NoBounce API key (get a free key at https://nobounceapi.com/register)>'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "nobounce-email-validation": {
            "type": "http",
            "url": "https://nobounceapi.com/mcp",
            "headers": {
                "X-API-Key": "<NoBounce API key (get a free key at https://nobounceapi.com/register)>"
            }
        }
    }
}

Documentation

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

Contents
  1. NoBounce Email Validation MCP Server (nobounce-mcp)
  2. Get a Free API Key
  3. Tools Provided
  4. Quickstart (Claude Desktop / Cursor / Windsurf)
  5. License

NoBounce Email Validation MCP Server (nobounce-mcp)

Official Model Context Protocol (MCP) server for NoBounce Email Validation & Bulk CSV Verification API.

Allows AI assistants (Claude Desktop, Cursor, Windsurf, Cline, etc.) to verify single email addresses and bulk email lists in real time:

  • RFC 5322 Syntax & Domain Check
  • DNS MX Record Lookup
  • 5,000+ Disposable / Temp-Mail Provider Detection
  • Role Account Detection (support@, admin@, sales@)
  • Typo Suggestion (gmial.com -> gmail.com)
  • Optional Deep SMTP Mailbox Handshake
  • Bulk Batch Validation (up to 1,000 emails per call with graceful partial-quota processing)

Get a Free API Key

Grab a free API key (100 free validations/month, no credit card required) at https://nobounceapi.com/register.

Tools Provided

  1. validate_email — Validate a single email address (email, optional smtp_check).
  2. validate_emails_bulk — Validate an array of up to 1,000 email addresses (emails, optional smtp_check).

Quickstart (Claude Desktop / Cursor / Windsurf)

Add to your claude_desktop_config.json or .cursor/mcp.json:

{
  "mcpServers": {
    "nobounce": {
      "command": "npx",
      "args": ["-y", "github:notprathap/nobounce-mcp"],
      "env": {
        "NOBOUNCE_API_KEY": "nb-your-api-key-here"
      }
    }
  }
}

License

MIT — https://nobounceapi.com

Frequently asked questions

What is NoBounce Email Validation?

Real-time single and bulk email validation (syntax, MX, 5,000+ disposable domains, SMTP).

How do I install NoBounce Email Validation?

It runs as a remote server. In Claude Code: claude mcp add --transport http nobounce-email-validation 'https://nobounceapi.com/mcp' --header 'X-API-Key: <NoBounce API key (get a free key at https://nobounceapi.com/register)>'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does NoBounce Email Validation need an API key?

Yes. It expects X-API-Key, which you set in its configuration.

Is NoBounce Email Validation open source?

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

Who maintains NoBounce Email Validation?

It is published by notprathap. 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.