//218purge_sentmail_interval
// how often to purge the Sent-Mail folder?
// 'value': yearly = 1, monthly = 2, weekly = 3, daily = 4, every login = 5
$_prefs['purge_sentmail_interval'] = array(
    'value' => '2',
    'locked' => false,
    'shared' => false,
    'type' => 'select',
    'desc' => _("Purge sent-mail how often:"),
    'help' => 'prefs-purge_sentmail_interval');

