hi,
i had the problem, that i could not log in as the user who admins the global addressbook, due to the fact, that in globaladdressbook.php the mail-host is supposed to be localhost.
i have changed a view lines of code to solve this issue.
in globaladdressbook.php
private $host;
/* original private $host = 'localhost'; */
after $this->user_name = $rcmail->config->get('globaladdressbook_user'); i added
$this->host = $rcmail->config->get('globaladdressbook_host');
in config.inc.php
$rcmail_config['globaladdressbook_host'] = 'put in your mail-host here';
maybe it could be a good idea to place these lines in the normal plugin as well.
kind regards
max