register user filter

Hi,

I use the following filter to create a new user from emails received.
Users dont seem to register for the last few emails, has there been any changes with the postie plugin that might affect this ?

Thanks.

<?php

add_filter('postie_filter_email', 'my_filterEmail');

function my_filterEmail($email) {
    //create the user
    $user = get_user_by('email', $email);
    if (empty($user)) {
        $user_name = strstr($email, '@', true);
        $userid = register_new_user($user_name, $email);
    }

    return $email;
}

?>