code: public void setBcc(Object bcc) throws ApplicationException {
  	if (StringUtil.isEmpty(bcc)) return;
  	try {
  	    smtp.addBCC(bcc);
  	}
  	catch (Exception e) {
  	    throw new ApplicationException("attribute [bcc] of the tag [mail] is invalid", e.getMessage());
  	}
      }
docs: set the value bcc Indicates addresses to copy the e-mail message to, without listing them in the
  message header. "bcc" stands for "blind carbon copy."
  
  @param strBcc value to set
  @throws ApplicationException