Linha 1853 do código:

switch (strtolower($position)) {
case 'phrase':
$encoded = preg_replace("/([^A-Za-z0-9!*+\/ -])/e", "'='.sprintf('%02X', ord('\\1'))", $encoded);
break;
case 'comment':
$encoded = preg_replace("/([\(\)\"])/e", "'='.sprintf('%02X', ord('\\1'))", $encoded);
case 'text':
default:

Erro do smtp:

public function sendEmail($subject, $msg, $from, $nomefrom, $destino, $nomedestino){ require_once "Mailer/class.phpmailer.php"; $mail = new PHPMailer();//Instancia a classe phpMailer

$mail->isSMTP(true);//Habilita envio smtp
$mail->SMTPAuth = true;//Autencica o envio smtp
$mail->SMTPSecure = 'ssl';//SSL requerido pelo Gmail
$mail->Host = "smtp.gmail.com";
$mail->Port = '465';//colocar a porta de envio quando o email da doce algodao estiver pronto

$mail->Username = 'fabioalvesdourado@gmail.com';
$mail->Password = 'senha';

$mail->From = $from;
$mail->FromName = $nomefrom;

$mail->isHtml(true);
$mail->Subject = utf8_encode($subject);
$mail->Body =utf8_encode($msg);
$mail->AddAddress($destino, utf8_encode($nomedestino));

if($mail->Send()){
return true;
}else{
return false;
}
}