php mailer => SPAM

        require_once 'mail/PHPMailerAutoload.php';
            $mail = new PHPMailer;
            $mail->setFrom("m@mailer.sk", 'Mailer.sk0');
            $mail->addAddress($_POST['to'], 'Mailer.sk0');
            $mail->addReplyTo($row2["k_mail"], 'Odpovede');
            $mail->isHTML(true);
            $mail->Subject = $row2["subject"];
            $mail->Body    = $msg;
            $mail->AltBody = 'Odoslane pomocou Mailer.sk';

if(!$mail->send()) {
    echo 'Message could not be sent.';
    echo 'Mailer Error: ' . $mail->ErrorInfo;
} else {
    echo 'Message odoslana';
}