code: public HtmlEmailImpl setTextMsg(String aText) throws EmailException {
  	if (StringUtil.isEmpty(aText)) {
  	    throw new EmailException("Invalid message supplied");
  	}
  	this.text = aText;
  	return this;
      }
docs: Set the text content.
  
  @param aText A String.
  @return An HtmlEmail.
  @throws EmailException see javax.mail.internet.MimeBodyPart for definitions