[Johannes Strodl]

You can remove any cookie by modifying the HTTP header before it is send to the client.

1) Create a child theme from your theme. (There are several excellent tutorial on the web which explains the creations of child themes. It is very easy.)
2) Create a "functions.php" file in the root directory of your new child theme.
3) Add a hook in "functions.php" for wordpress to modify the HTTP header before it is send:

<?php
// filter cookies
function my_remove_cookies($headers) {
    if (isset($_COOKIE['newsletter'])) {
        unset($_COOKIE['newsletter']);
        setcookie('newsletter', null, -1, '/');
    }
    return $headers;
}
add_filter('wp_headers', 'my_remove_cookies');

This will remove the cookie named "newsletter". The cookie will never be published to the client. Beware if you use a caching plugin for wordpress. Sometimes the cached page can't be changed by the "wp_headers" hook any more. Then deeper studies of the caching machinery is needed to remove the header part of the cookie.

When i have time, i will create a plugin to remove cookies by name. Maybe this is a needful thing for such problems.

Greetings,
Johannes

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