code: public void addBcc(Address address) {
          assertArgumentNotNull("address", address);
          saveBcc(address);
          try {
              message.addRecipient(RecipientType.BCC, address);
          } catch (MessagingException e) {
              String msg = buildAddressSettingFailureMessage("bcc", address);
              throw new SMailMessageSettingFailureException(msg, e);
          }
      }
docs: -----------