// add archive folder to the list of default mailboxes
if (($default_folders = $rcmail->config->get('default_imap_folders')) && !in_array($archive_folder, $default_folders)) {
$default_folders[] = $archive_folder;
$rcmail->config->set('default_imap_folders', $default_folders);
// add archive folder to the list of default mailboxes
if (($default_folders = $rcmail->config->get('default_imap_folders')) && !in_array($archive_folder, $default_folders)) {
$default_folders[] = $archive_folder;
$rcmail->config->set('default_imap_folders', $default_folders);