I try the test connection succesfull
mail4us.net ok
ssl google ok
Here my config.inc.php
/*accounts plugin */
// navigation config (requires plugin settings @website http://myroundcube.googlecode.com)
$rcmail_config['settingsnav'][] = array('part' => '', 'locale' => 'settings.accounts', 'href' => './?_task=settings&_action=plugin.accounts&_framed=1', 'onclick' => '', 'descr' => 'accounts');
/* database table name */
$rcmail_config['db_table_accounts'] = 'accounts';
/* allowed hosts ::: array() = all */
$rcmail_config['accounts_hosts'] = array(
"My Host" => "localhost:143",
"Google Mail" => "ssl://imap.gmail.com:993"
);
/* always use default smtp server */
$rcmail_config['accounts_smtp_default'] = TRUE;