# Verify lead emails before cold outreach

**Use case:** 

Check the email addresses of scraped or purchased leads before you load them into your outreach tool. Invalid and disposable addresses are flagged, catch-all domains are marked risky, and the results keep the order of your list so they merge back into your lead sheet easily.

## Input

```json
{
  "emails": [
    "info@apple.com",
    "hello@stripe.com",
    "no.such.user.2026@gmail.com"
  ],
  "maxConcurrency": 20
}
```

## Output

```json
{
  "position": {
    "label": "#",
    "format": "integer"
  },
  "email": {
    "label": "Email",
    "format": "string"
  },
  "result": {
    "label": "Result",
    "format": "string"
  },
  "message": {
    "label": "Verdict",
    "format": "string"
  },
  "code": {
    "label": "Code",
    "format": "string"
  },
  "domain": {
    "label": "Domain",
    "format": "string"
  },
  "mx": {
    "label": "Mail server",
    "format": "string"
  },
  "checkedAt": {
    "label": "Checked at",
    "format": "string"
  }
}
```

## How it works

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

The MailTester Ninja Email Verifier Actor is ready to run with the inputs already set for "Verify lead emails before cold outreach". [Sign up or log in](https://console.apify.com/create-task-from-example/gSjGIe6PSmLogGLvM) and you'll land in Apify Console with a copy of this exact task.

### 2. Start the "Verify lead emails before cold outreach" task

The MailTester Ninja Email Verifier Actor will start running based on the input automatically. You can also change all the input fields, like email addresses and maximum parallel checks, to match your specific use case.

### 3. Receive the "Verify lead emails before cold outreach" 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, result, 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 "Verify lead emails before cold outreach" task via API](https://apify.com/mailtester-ninja/email-verifier.md).

## FAQ

### Can this task verify the emails found by another Actor?

This task takes a list of addresses: copy the email column of another Actor's results into its input, or start it from the Apify API once your lead scraper has finished.

### Why are some leads marked risky?

This task marks a lead risky when its domain accepts every address (catch-all) or answers with a temporary refusal. No tool can confirm a mailbox on a catch-all domain, so decide by risk or check again later.

### What does this task cost?

This task adds no charge of its own: you only pay the Apify usage of the run, which stays tiny. It needs a MailTester Ninja key, either a free API token (50 checks a day) or a plan from $6.99 a week for 100,000 checks a day.

### What happens if I run this task without a key?

Without a MailTester Ninja key, this task only checks its three sample addresses so you can see the output. Add your key in the input to verify your own list.

## About this Actor

This example demonstrates how to use [MailTester Ninja Email Verifier](https://apify.com/mailtester-ninja/email-verifier.md) with a specific input configuration. Visit the [Actor detail page](https://apify.com/mailtester-ninja/email-verifier.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/mailtester-ninja/email-verifier.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`).