Changing Impresspages to use SMTP - php

Question

I need to change the code below that belongs to Impresspages CMS to use SMTP instead of sendmail. How can I do this?
<?php
/**
* Queue controls the amount of emails per hour.
* All emails ar placed in queue and send as quiq as possible.
* Parameter "hourlyLimit" defines how much emails can be send in one hour.
* If required amount of emails is bigger than this parameter, part of messages will wait until next hour.
*
* #package ImpressPages
*
*
*/
namespace Ip\Internal\Email;
/**
* Class to send emails. Typically all emails should be send trouht this class.
* #package ImpressPages
*/
class Module
{
/**
* Adds email to the queue
*
* Even if there is a big amount of emails, there is always reserved 20% of traffic for immediate emails.
* Such emails are: registration cofirmation, contact form data and other.
* Newsletters, greetings always can wait a litle. So they are not immediate and will not be send if is less than 20% of traffic left.
*
* #param string $from email address from whish an email should be send
* #param $fromName
* #param string $to email address where an email should be send
* #param $toName
* #param $subject
* #param string $email email html text
* #param bool $immediate indicate hurry of an email.
* #param bool $html true if email message should be send as html
* #param array $files files that should be attached to the email. Files should be accessible for php at this moment. They will be cached until send time.
* #internal param $string #fromName
* #internal param $string #toName
*/
function addEmail($from, $fromName, $to, $toName, $subject, $email, $immediate, $html, $files = null)
{
$cached_files = [];
$cached_fileNames = [];
$cached_fileMimeTypes = [];
if ($files) {
if (is_string($files)) {
$files = array($files);
}
foreach ($files as $fileSetting) {
$file = [];
if (is_array($fileSetting)) {
$file['real_name'] = $fileSetting[0];
$file['required_name'] = basename($fileSetting[1]);
} else {
$file['real_name'] = $fileSetting;
$file['required_name'] = basename($fileSetting);
}
$new_name = 'contact_form_' . rand();
$new_name = \Ip\Internal\File\Functions::genUnoccupiedName($new_name, ipFile('file/tmp/'));
if (copy($file['real_name'], ipFile('file/tmp/' . $new_name))) {
$cached_files[] = ipFile('file/tmp/' . $new_name);
$cached_fileNames[] = $file['required_name'];
$tmpMimeType = \Ip\Internal\File\Functions::getMimeType($file['real_name']);
if ($tmpMimeType == null) {
$tmpMimeType = 'Application/octet-stream';
}
$cached_fileMimeTypes[] = $tmpMimeType;
} else {
trigger_error('File caching failed');
}
}
}
$cachedFilesStr = implode("\n", $cached_files);
$cachedFileNamesStr = implode("\n", $cached_fileNames);
$cachedFileMimeTypesStr = implode("\n", $cached_fileMimeTypes);
$email = str_replace('src="' . ipConfig()->baseUrl(), 'src="', $email);
Db::addEmail(
$from,
$fromName,
$to,
$toName,
$subject,
$email,
$immediate,
$html,
$cachedFilesStr,
$cachedFileNamesStr,
$cachedFileMimeTypesStr
);
}
/**
* Checks if there are some emails waiting in queue and sends them if possible.
*/
function send()
{
$alreadySent = Db::sentOrLockedCount(60);
if ($alreadySent !== false) {
$available = floor(ipGetOption('Email.hourlyLimit') * 0.8 - $alreadySent); //20% for immediate emails
$lockKey = md5(uniqid(rand(), true));
if ($available > 0) {
if ($available > 5 && !defined('CRON')) { //only cron job can send many emails at once.
$available = 5;
}
$locked = Db::lock($available, $lockKey);
} else {
$available = 0;
$locked = 0;
}
if ($locked == $available) { //if in queue left some messages
if (ipGetOption('Email.hourlyLimit') - ($alreadySent + $available) > 0) {
$locked = $locked + Db::lockOnlyImmediate(
ipGetOption('Email.hourlyLimit') - ($alreadySent + $available),
$lockKey
);
}
}
if ($locked) {
$emails = Db::getLocked($lockKey);
foreach ($emails as $key => $email) {
if (function_exists('set_time_limit')) {
set_time_limit((sizeof($emails) - $key) * 10 + 100);
}
$mail = new \PHPMailer();
/* $mail->Sender = $email['from'];
$mail->addCustomHeader("Return-Path: " . $email['from']);*/
$mail->From = $email['from'];
$mail->FromName = $email['fromName'];
$mail->AddReplyTo($email['from'], $email['fromName']);
$mail->WordWrap = 50; // set word wrap
$mail->CharSet = ipConfig()->get('charset');
$mail->Subject = $email['subject'];
/* foreach($this->posted_files as $file){
if(isset($_FILES[$file]['tmp_name']) && $_FILES[$file]['error'] == 0){
$mail->AddAttachment($_FILES[$file]['tmp_name'], $_FILES[$file]['name']);
}
}*/
$files = explode("\n", $email['files']);
$fileNames = explode("\n", $email['fileNames']);
$fileMimeTypes = explode("\n", $email['fileMimeTypes']);
$fileCount = min(count($files), count($fileNames), count($fileMimeTypes));
for ($i = 0; $i < $fileCount; $i++) {
if ($files[$i] != '') {
if ($fileMimeTypes[$i] == '') {
$answer = $mail->AddAttachment($files[$i], $fileNames[$i]);
} else {
$answer = $mail->AddAttachment(
$files[$i],
$fileNames[$i],
"base64",
$fileMimeTypes[$i]
);
}
if (!$answer) {
ipLog()->error(
'Email.addAttachmentFailed: {subject} to {to}',
array(
'to' => $email['to'],
'subject' => $email['subject'],
'filename' => $fileNames[$i],
)
);
return false;
}
}
}
if ($email['html']) {
$mail->IsHTML(true); // send as HTML
$mail->MsgHTML($email['email']);
try {
$altBody = \Ip\Internal\Text\Html2Text::convert($email['email']);
} catch (\Ip\Internal\Text\Html2TextException $e) {
$altBody = $email['email'];
}
$mail->AltBody = $altBody;
} else {
/*$h2t = new \Ip\Internal\Text\Html2Text($content, false);
$mail->Body = $h2t->get_text();*/
$mail->Body = $email['email'];
}
$mail->AddAddress($email['to'], $email['toName']);
$mail = ipFilter('ipSendEmailPHPMailerObject', $mail, $email);
if (!$mail->Send()) {
ipLog()->error(
'Email.sendFailed: {subject} to {to}',
array('to' => $email['to'], 'subject' => $email['subject'], 'body' => $email['email'])
);
return false;
}
if (sizeof($emails) > 5) {
sleep(1);
}
Db::unlockOne($email['id']);
}
}
}
return null;
}
}