def copy_to!(mailbox_name)
      mailbox.select!
      connection.uid_copy([uid], Luggage::Mailbox.convert_mailbox_name(mailbox_name))
    end
def copy_to!(mailbox_name)
      mailbox.select!
      connection.uid_copy([uid], Luggage::Mailbox.convert_mailbox_name(mailbox_name))
    end
Uses IMAP's COPY command to copy the message into the named mailbox