Display E-Mail Adresse of anonym visitors in Drupal-comments securely

Visitors post comments and they live sometimes their contact information like email address to get feedback. If you display e-mail spambots will catch them before other visitors. If you dont display, other visitors cannot send feedback. What is the secure anti-spam solution?

Here is what I did:

- email adresse of comment-poster will just partly shown to other anonym visitors (and with a tip to register to see full email)
- email adresse of comment-poster will shown to other registered visitors fully

To do that I need to change Druplas core comment-module and add a couple of php lines.

public_html/modules/comment/comment.tpl.php

  <div class="submitted">
    <?php print $submitted ?> 
	<?php 
        if($comment->mail) { 
            $comment_posters_name = str_replace("Guest ", "", $comment->name);
            $comment_posters_mail = $comment->mail;
            $comment_posters_mail2 = preg_replace("#(.*@..)(.*)#sim", "$1", $comment_posters_mail);
                
            if($user->uid){
                echo "<p><b>E-Mail Addresse of  <u>$comment_posters_name</u> is: $comment_posters_mail</b></p>";
            } else {

echo "E-Mail Addresse of $comment_posters_name({$comment_posters_mail2}...) is just for < a href="/user/register">registered users< /a> available!"; } } ?> </div>

Display E-Mail Adresse of anonym visitors in Drupal-comments securely

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