# File lib/vmail/imap_client.rb, line 567
    def copy_to(uid_set, mailbox)
      uid_set = uid_set.split(',').map(&:to_i)
      if mailbox_aliases[mailbox]
        mailbox = mailbox_aliases[mailbox]
      end
      create_if_necessary mailbox
      log "copying #{uid_set.inspect} to #{mailbox}"
      spawn_thread_if_tty do 
        log @imap.uid_copy(uid_set, mailbox)
        log "copied uid_set #{uid_set.inspect} to #{mailbox}"
      end
    end