# Real-Time Live SMTP Mailbox Validator (250 OK Handshake)

**Use case:** 

Validate email mailboxes via direct, real-time SMTP handshakes (RCPT TO) against receiving mail servers. Goes beyond basic regex and MX record checks to confirm whether the recipient inbox physically exists and accepts mail. Ideal for developers, API integrations, and CRM hygiene.

## Input

```json
{
  "emails": [
    "billing@cloudflare.com",
    "founders@ycombinator.com",
    "security@databricks.com",
    "legal@uber.com",
    "invalid.mailbox.does.not.exist@microsoft.com"
  ],
  "csvUrl": "https://docs.google.com/spreadsheets/d/.../export?format=csv",
  "datasetId": "abc123def456",
  "emailColumn": "",
  "concurrency": 10,
  "maxRetries": 1,
  "timeout": 20,
  "freeTierNotice": " "
}
```

## Output

```json
{
  "email": {
    "label": "Email Address",
    "format": "text"
  },
  "status": {
    "label": "Status",
    "format": "text"
  },
  "is_disposable": {
    "label": "Disposable",
    "format": "boolean"
  },
  "is_role_based": {
    "label": "Role-Based",
    "format": "boolean"
  },
  "is_catch_all": {
    "label": "Catch-All",
    "format": "boolean"
  },
  "is_free_provider": {
    "label": "Free Provider",
    "format": "boolean"
  },
  "mx_host": {
    "label": "MX Host",
    "format": "text"
  },
  "smtp_response": {
    "label": "SMTP Response",
    "format": "text"
  },
  "verified_at": {
    "label": "Verified At",
    "format": "text"
  }
}
```

## How it works

### 1. Sign up on Apify or log in

The Email Verifier & Validator|0.85$/1k - Bulk Email No API Actor is ready to run with the inputs already set for "Real-Time Live SMTP Mailbox Validator (250 OK Handshake)". [Sign up or log in](https://console.apify.com/create-task-from-example/ZQcSvWCckOwkYJvd9) and you'll land in Apify Console with a copy of this exact task.

### 2. Start the "Real-Time Live SMTP Mailbox Validator (250 OK Handshake)" task

The Email Verifier & Validator|0.85$/1k - Bulk Email No API Actor will start running based on the input automatically. You can also change all the input fields, like email addresses, CSV File URL, and more, to match your specific use case.

### 3. Receive the "Real-Time Live SMTP Mailbox Validator (250 OK Handshake)" output

Monitor the progress in real time. You will be notified as soon as your dataset is complete and ready for review. Each result includes data such as email address, status, disposable, and more.

### 4. Integrate into your workflow

The final output is delivered in JSON, CSV, or Excel format, ready to be plugged into your workflow. You can also [run the "Real-Time Live SMTP Mailbox Validator (250 OK Handshake)" task via API](https://apify.com/blessiticus/email-verifier-pro.md).

## About this Actor

This example demonstrates how to use [Email Verifier & Validator|0.85$/1k - Bulk Email No API](https://apify.com/blessiticus/email-verifier-pro.md) with a specific input configuration. Visit the [Actor detail page](https://apify.com/blessiticus/email-verifier-pro.md) to learn more, explore other use cases, and run it yourself.


## How to integrate an Actor?

This Task's input is already configured above. Use it as-is rather than inventing a new one.

Do not guess an integration path. Every one of them is in the agent quickstart at https://apify.com/agents.md: the Apify MCP server, Agent Skills with the Apify CLI, the JavaScript and Python clients, the REST API, and the account-free path for an agent with no human to sign in. It also carries the rule on stating cost before the first paid run.

For full API examples (JavaScript, Python, CLI, MCP, OpenAPI), see this Task's Actor page: https://apify.com/blessiticus/email-verifier-pro.md

Each client library has reference documentation the quickstart does not restate: [JavaScript/TypeScript](https://docs.apify.com/api/client/js/docs.md) (`npm install apify-client`) and [Python](https://docs.apify.com/api/client/python/docs.md) (`pip install apify-client`).