code: public void addBcc(String address, String personal) throws AddressException {
  		if(bcc == null) {
  			bcc = new ArrayList<>();
  		}
  		bcc.add( toInternetAddress(address, personal) );
  	}
docs: adds a BCC recipient
  
  @param address a valid email address
  @param personal the real world name of the sender (can be null)
  @throws AddressException in case of an invalid email address