// source http://pastebin.com/n3WQdLDh
function extra_notify_postauthor( $comment_id, $comment_type = '' ) {
        $comment = get_comment( $comment_id );
        $post    = get_post( $comment->comment_post_ID );
        $author  = get_userdata( $post->post_author );
 
        // The comment was left by the author
        if ( $comment->user_id == $post->post_author )
                return false;
 
        // The author moderated a comment on his own post
        if ( $post->post_author == get_current_user_id() )
                return false;
 
        // If there's no email to send the comment to
        if ( '' == $author->user_email )
                return false;
 
        $comment_author_domain = @gethostbyaddr($comment->comment_author_IP);
 
        // The blogname option is escaped with esc_html on the way into the database in sanitize_option
        // we want to reverse this for the plain text arena of emails.
        $blogname = wp_specialchars_decode(get_option('blogname'), ENT_QUOTES);
 
        if ( empty( $comment_type ) ) $comment_type = 'comment';
 
        if ('comment' == $comment_type) {
                $notify_message  = sprintf( __( 'New comment on your post "%s"' ), $post->post_title ) . "\r\n";
                /* translators: 1: comment author, 2: author IP, 3: author domain */
                $notify_message .= sprintf( __('Author : %1$s (IP: %2$s , %3$s)'), $comment->comment_author, $comment->comment_author_IP, $comment_author_domain ) . "\r\n";
                $notify_message .= sprintf( __('E-mail : %s'), $comment->comment_author_email ) . "\r\n";
                $notify_message .= sprintf( __('URL    : %s'), $comment->comment_author_url ) . "\r\n";
                $notify_message .= sprintf( __('Whois  : http://whois.arin.net/rest/ip/%s'), $comment->comment_author_IP ) . "\r\n";
                $notify_message .= __('Comment: ') . "\r\n" . $comment->comment_content . "\r\n\r\n";
                $notify_message .= __('You can see all comments on this post here: ') . "\r\n";
                /* translators: 1: blog name, 2: post title */
                $subject = sprintf( __('[%1$s] Comment: "%2$s"'), $blogname, $post->post_title );
        } elseif ('trackback' == $comment_type) {
                $notify_message  = sprintf( __( 'New trackback on your post "%s"' ), $post->post_title ) . "\r\n";
                /* translators: 1: website name, 2: author IP, 3: author domain */
                $notify_message .= sprintf( __('Website: %1$s (IP: %2$s , %3$s)'), $comment->comment_author, $comment->comment_author_IP, $comment_author_domain ) . "\r\n";
                $notify_message .= sprintf( __('URL    : %s'), $comment->comment_author_url ) . "\r\n";
                $notify_message .= __('Excerpt: ') . "\r\n" . $comment->comment_content . "\r\n\r\n";
                $notify_message .= __('You can see all trackbacks on this post here: ') . "\r\n";
                /* translators: 1: blog name, 2: post title */
                $subject = sprintf( __('[%1$s] Trackback: "%2$s"'), $blogname, $post->post_title );
        } elseif ('pingback' == $comment_type) {
                $notify_message  = sprintf( __( 'New pingback on your post "%s"' ), $post->post_title ) . "\r\n";
                /* translators: 1: comment author, 2: author IP, 3: author domain */
                $notify_message .= sprintf( __('Website: %1$s (IP: %2$s , %3$s)'), $comment->comment_author, $comment->comment_author_IP, $comment_author_domain ) . "\r\n";
                $notify_message .= sprintf( __('URL    : %s'), $comment->comment_author_url ) . "\r\n";
                $notify_message .= __('Excerpt: ') . "\r\n" . sprintf('[...] %s [...]', $comment->comment_content ) . "\r\n\r\n";
                $notify_message .= __('You can see all pingbacks on this post here: ') . "\r\n";
                /* translators: 1: blog name, 2: post title */
                $subject = sprintf( __('[%1$s] Pingback: "%2$s"'), $blogname, $post->post_title );
        }
        $notify_message .= get_permalink($comment->comment_post_ID) . "#comments\r\n\r\n";
        $notify_message .= sprintf( __('Permalink: %s'), get_permalink( $comment->comment_post_ID ) . '#comment-' . $comment_id ) . "\r\n";
                $notify_message .= sprintf( __('Approve it: %s'), admin_url("comment.php?action=approve&c=$comment_id") ) . "\r\n";
       
        if ( EMPTY_TRASH_DAYS )
                $notify_message .= sprintf( __('Trash it: %s'), admin_url("comment.php?action=trash&c=$comment_id") ) . "\r\n";
        else
                $notify_message .= sprintf( __('Delete it: %s'), admin_url("comment.php?action=delete&c=$comment_id") ) . "\r\n";
        $notify_message .= sprintf( __('Spam it: %s'), admin_url("comment.php?action=spam&c=$comment_id") ) . "\r\n";
 
        $wp_email = 'wordpress@' . preg_replace('#^www\.#', '', strtolower($_SERVER['SERVER_NAME']));
 
        if ( '' == $comment->comment_author ) {
                $from = "From: \"$blogname\" <$wp_email>";
                if ( '' != $comment->comment_author_email )
                        $reply_to = "Reply-To: $comment->comment_author_email";
        } else {
                $from = "From: \"$comment->comment_author\" <$wp_email>";
                if ( '' != $comment->comment_author_email )
                        $reply_to = "Reply-To: \"$comment->comment_author_email\" <$comment->comment_author_email>";
        }
 
        $message_headers = "$from\n"
                . "Content-Type: text/plain; charset=\"" . get_option('blog_charset') . "\"\n";
 
        if ( isset($reply_to) )
                $message_headers .= $reply_to . "\n";
 
        $notify_message = apply_filters('comment_notification_text', $notify_message, $comment_id);
        $subject = apply_filters('comment_notification_subject', $subject, $comment_id);
        $message_headers = apply_filters('comment_notification_headers', $message_headers, $comment_id);
 
        @wp_mail( $author->user_email, $subject, $notify_message, $message_headers );
 
        return true;
}
 
add_action('comment_post', 'extra_notify_postauthor');