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Gmail SMTP server address: smtp.gmail.com
Gmail SMTP username: Your full Gmail address (e.g. yourusername@gmail.com)
Gmail SMTP password: Your Gmail password
Gmail SMTP port (TLS): 587
Gmail SMTP port (SSL): 465
Gmail SMTP TLS/SSL required: yes


HTML:
<form action="" method="POST" id="leadform">
   ...
   ..
   .
</form>

<div id="loader" class="col-md-12" style="display:none;">
  <img src="<?php  echo get_bloginfo('template_directory'); ?>/images/spinner.gif">
</div>							

<div class="col-md-12 text-center">
	<div id="result" class="alert alert-success" style="display:none;"></div>
</div>


================================================================================

CSS:
<style>
#loader {
	display:none; 
    position: fixed;
    background: rgba(0, 0, 0, 0.66);
    width: 100%;
    top: 0;
    bottom: 0;
    left: 0;
    padding-top: 15%;
    overflow: hidden;
    margin: 0 auto;
    text-align: center;
}

#loader img { margin: 0 auto; }

</style>

================================================================================

JS:

<script>
jQuery(document).ready(function() {
	jQuery("#leadform").submit(function(event) {
	    jQuery('#loader').show() ; // show the loader on init
	    /* Stop form from submitting normally */
	    event.preventDefault();

      // note the html ID has dashes "-" , the var for recaptcha has underscores
      // you will need to refer to this var as $_POST['g_recaptcha_response']
      // not $_POST['g-recaptcha-response']
	    var g_recaptcha_response  = jQuery('#g-recaptcha-response').val();
	    var currenturl = jQuery('#currenturl').val();
	    var values = jQuery(this).serialize();

	    /* Clear result div*/
	    jQuery("#result").html('');
	    
	    ajaxRequest = jQuery.ajax({
	       url: "<?php echo get_template_directory_uri() ; ?>/send_email.php",
	       type: "post",
	       data: values
	    });
	    
	    /*  request cab be abort by ajaxRequest.abort() */
	    ajaxRequest.done(function (response, textStatus, jqXHR){
	       // show successfully for submit message
	       console.log("SUCCESS") ;
	       jQuery('#result').show() ;
	       jQuery("#result").html(response);
	       jQuery('#loader').hide() ; // ajax successful , hide the loader
	       setTimeout(function () {
	         window.location.href=currenturl; // the redirect goes here
	       },3000); // 3 seconds            
	    });
	    /* On failure of request this function will be called  */
	    ajaxRequest.fail(function (response){
	       // show error
	       console.log(" ajax fail ERROR" + response) ;
	       jQuery("#result").html('Error found trying to submit the form: ' + response );
	    });

	});

}); // end document ready
</script>


============================== send_email.php ==================================

<?php

require 'PHPMailerAutoload.php';
require_once 'Recaptcha.php';
// require_once dirname(__FILE__) . '/Recaptcha.php';
if ( ! class_exists('Recaptcha') ) 
  die('Class Recaptcha not found') ; 

$recaptcha = $_POST['g_recaptcha_response'];

// sanitize POST input 
extract($_POST) ;

$current_date = date('n/j/Y'); 
$current_time = date('g:i a') ;

// create new object, use to verify recaptcha response
$recobj = new Recaptcha();
$response = $recobj->verifyResponse($recaptcha);

if( isset($response['success']) && $response['success'] != true )  {
	echo "An Error Occurred and Error code is :".$response['error-codes'];
}
else {

	$mail = new PHPMailer;
	
	//$mail->SMTPDebug = 3;                               // Enable verbose debug output
	
	$mail->isSMTP();                                      // Set mailer to use SMTP
	$mail->SMTPAuth   = true;                  // enable SMTP authentication
	$mail->SMTPSecure = "tls";                 // sets the prefix to the servier
	$mail->Host       = "mail.smtp2go.com ";      // sets GMAIL as the SMTP server
	$mail->Port       = 80;                   // set the SMTP port for the GMAIL server
	$mail->Username   = "armadillo";  // GMAIL username
	$mail->Password   = "popadmin7480#";                              
	
	$mail->setFrom('admin@bristlebarn.com', 'BristleBarn Admin');
	$mail->addReplyTo('jcadima85@gmail.com', 'reply to');
	$mail->addAddress( 'jcadima85@gmail.com', 'Bristle Barn');     // Add a recipient
	
	$mail->isHTML(true);                                  // Set email format to HTML
	
	$mail->Subject = 'New Lead: ' . $product_title ;
	$mail->Body    = "
    ==================================== <br>
    INDUSTRIAL BRUSH CORPORATION<br>
    Internet Information Form   -  Contact<br>
    Date: $current_date Time:  $current_time<br>
    ====================================<br>
    
    <strong>Product Name:</strong> $product_title<br>
    <strong>Company Name:</strong> $company<br>
    <strong>Address:</strong>   $address<br>
    <strong>City:</strong>   $city<br>
    <strong>State:</strong>   $state<br>
    <strong>Zip:</strong>   $zip<br>
    <strong>Phone Number:</strong> $phonenumber    <br>
    <strong>Email:</strong>    $email<br>" ;
	
	// $mail->AltBody = 'This is the body in plain text for non-HTML mail clients';
	
	if(!$mail->send() ) {
	    echo 'Message could not be sent.';
	    //echo 'Mailer Error: ' . $mail->ErrorInfo;
	} else {
	    echo 'Message has been sent';
	}	
	
}
?>


============================== config.php ======================================
<?php
// [ ] will not work on old PHP versions, use array()
return [
	'client-key' => '6LeT7h8UAAAAALq7qjy90QTcjphFpAtg3oW6zEcT',
	'secret-key' => '6LeT7h8UAAAAAOoLSh0t6tPgv8D3hCMUeJN5FxRY'
];

?>




============================== Recaptcha.php ===================================

<?php
class Recaptcha {
	
	public function __construct(){
		// retrieve config array values
        $this->config = require('config.php');
    }

	public function verifyResponse($recaptcha){
		
		// $remoteIp = $this->getIPAddress();

		// Discard empty solution submissions and return
		if (empty($recaptcha)) {
			return array(
				'success'     => false,
				'error-codes' => 'Recaptcha is required',
			);
		}

		// get a JSON response
		$jsonresponse = $this->getJSONResponse(
			array(
				'secret'   => $this->config['secret-key'],
				//'remoteip' => $remoteIp,
				'response' => $recaptcha,
			)
		);

		// decoded JSON reCAPTCHA server response
		$responses = json_decode($jsonresponse, true);

		// Set array keys for success/failure
		if ( isset($responses['success']) and $responses['success'] == true ) {
			$status = true;
		} else {
			$status = false;
			$error = (isset($responses['error-codes'])) ? $responses['error-codes']
				: 'invalid-input-response';
		}

		// return the status and if error-codes (if any)
		return array(
			'success'     => $status,
			'error-codes' => (isset($error)) ? $error : null,
		);
	}

	private function getJSONResponse($data){
		$url = 'https://www.google.com/recaptcha/api/siteverify?'.http_build_query($data);
		$response = file_get_contents($url);

		return $response;
	}

	private function getIPAddress(){
		if (!empty($_SERVER['HTTP_CLIENT_IP'])) {
			$ip = $_SERVER['HTTP_CLIENT_IP'];
		} 
		elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR']))  	{
			$ip = $_SERVER['HTTP_X_FORWARDED_FOR'];
		} 
		else  {
			$ip = $_SERVER['REMOTE_ADDR'];
		}
		
		return $ip;
	}

}