En mi caso lo hice de la siguiente manera
require sc_url_library("prj", "Mailer", "src/Exception.php");
require sc_url_library("prj", "Mailer", "src/PHPMailer.php");
require sc_url_library("prj", "Mailer", "src/SMTP.php");
$mail = new PHPMailer\PHPMailer\PHPMailer();
$mail->isSMTP();
$mail->CharSet = 'utf-8';
$mail->Host = 'correo.**.***.**'; // Provider
$mail->SMTPAuth = true;
$mail->Username = 'infosistemas'; // User
$mail->Password = '**********'; // Paßwort
$mail->SMTPSecure = 'tls';
$mail->Port = ****; // Port
$mail->Timeout = 60;
$mail->From = 'infosistemas@***.**';
$mail->FromName = 'Info Sistemas';
$mail->addAddress('email@email.com');
$mail->isHTML(true);
$Message = $param_message;
$mail->Subject = {lang_subject_mail};
$mail->Body = $Message;
if(!$mail->send())
{
sc_error_message('Message could not be sent. Mailer Error: ' . $mail->ErrorInfo);
}
else
{
sc_alert('Message has been sent');
}