Send wp post title on an email with onclick function

I am sending an email to my outlook account every time the <a> is clicked. I want that the message has the title of the wordpress post where the link was clicked, however, it is not printed in the email. It's not recognizing the_title(); to get post title. Other problem is that the email is going into the spam folder.

how to fix this?

<a href="#" onclick="callFunction();">Report</a>
<script type="text/javascript">
    function callFunction(){
        <?php  
            $message = ''.the_title();
            $to = "my@outlook.com";
            $subject = "Expired post report";
            $from = "reporting@website.com"; 
            $headers = "From:" . $from;
            mail($to,$subject,$message,$headers); 
        ?>
    }
</script>