'(typ, [data]) = expunge()
Permanently remove deleted items from selected mailbox.
Generates \'EXPUNGE\' response for each deleted message.
\'data\' is list of \'EXPUNGE\'d message numbers in order received.'

def expunge(self, **kw):

    name = 'EXPUNGE'
    kw['untagged_response'] = name
    return self._simple_command(name, **kw)
