...
use Plumpboy\EmailValidate\SMTPEmailValidator;
...
	// the email to validate
	$email = 'user@example.com'; // $email can be array('user@example.com', 'user1@example.com')
	// an optional sender
	$sender = 'user@mydomain.com';
	// instantiate the class
	$SMTPValidator = new SMTPEmailValidator();
	// turn on debugging if you want to view the SMTP transaction
	$SMTPValidator->debug = true;
	// do the validation
	$results = $SMTPValidator->validate($email, $sender);
	// view results
	echo $email.' is '.($results ? 'valid' : 'invalid')."\n"; // $results[$email] when there are many emails

	// send email?
	if ($results) { // or $results['user@example.com'] if you pass many emails
		//mail($email, 'Confirm Email', 'Please reply to this email to confirm', 'From:'.$sender."\r\n"); // send email
	} else {
		echo 'The email addresses you entered is not valid';
	}

...
'providers' => [
	...
    Plumpboy\EmailValidate\EmailValidateServiceProvider::class,
    ...
],
...

$result = email_exists($emails, $sender); // use helper

...
use Plumpboy\EmailValidate\EmailValidator;
...
$result = EmailValidator::validate($email, $sender); // use facade

$result = \EmailValidator::validate($email, $sender); // or alias