# File lib/vmail/imap_client.rb, line 590
    def create_if_necessary(mailbox)
      current_mailboxes = mailboxes.map {|m| mailbox_aliases[m] || m}
      if !current_mailboxes.include?(mailbox)
        log "Current mailboxes: #{current_mailboxes.inspect}"
        log "Creating mailbox #{mailbox}"
        log @imap.create(mailbox) 
        @mailboxes = nil # force reload ...
        list_mailboxes
      end
    end