Which Mailing/Newsletter-Software for Revo?

<?php
// MAIL CHIMP CONFIG
$mcApiKey = '**YOUR API KEY HERE***';
$mcListId = '**YOUR LIST ID HERE***';
// other default params
$mcDblOptIn = false;
$mcUpdateExisting = true;
$mcReplaceInterests = true;
?>

<?php
require_once 'inc/MCAPI.class.php';
require_once 'mailchimp.config.php';

$oldEmail = $_POST['oldEmail'];
$newEmail = $_POST['newEmail'];
if (empty($oldEmail) || empty($newEmail)) return;

$merge_vars = array('EMAIL' => $newEmail);
$mcApi = new MCAPI($mcApiKey);
$returnedValue = $mcApi->listUpdateMember($mcListId, $oldEmail, $merge_vars, '', false);
?>

<?php
// MAIL CHIMP CONFIG
require_once 'inc/MCAPI.class.php';
require_once 'mailchimp.config.php';


$memberIdList = array();	// contains a list of all memeber id to be synced
// ..here comes your code to populate the above array with all the user id's you want..
if (empty($memberIdList)) return;

$batchSubscribe = array();
foreach ($memberIdList as $memberId) {	// construct batch array with member details
	$memberUser = $modx->getObject('modUser', $memberId);
	$memberProfile = $memberUser->getOne('Profile');
	if (!isset($memberProfile)) return;

	$memberMcArray = array(
		'EMAIL' => $memberProfile->get('email'),
		'FULLNAME' => $memberProfile->get('fullname'),
		'CITY' => $memberProfile->get('city'),
		'GENDER' => ($memberProfile->get('gender') === 1)? 'Male' : (($memberProfile->get('gender') === 2)? 'Female' : '' )
		// ** etc...  add here all your mailchimp fields **
	);
	
	$batchSubscribe[] = $memberMcArray;
}

if (empty($batchSubscribe)) return;

// ** DO IT **
$mcApi = new MCAPI($mcApiKey);
$vals = $mcApi->listBatchSubscribe($mcListId,$batchSubscribe,$mcDblOptIn, $mcUpdateExisting, $mcReplaceInterests);

// OUTPUT results with echo to a log file (it's cron'ed)
echo "\n** ".date("d/m/y")."\n";
if ($mcApi->errorCode){
    echo "Batch Subscribe failed!\n";
	echo "code:".$mcApi->errorCode."\n";
	echo "msg :".$mcApi->errorMessage."\n";
} else {
	echo "success:".$vals['success_count']."\n";
	echo "errors:".$vals['error_count']."\n";
	foreach($vals['errors'] as $val){
		echo $val['email_address']. " failed\n";
		echo "code:".$val['code']."\n";
		echo "msg :".$val['message']."\n";
	}
}