code: public void throwMailHtmlTemplateTextCannotContainHeaderDelimiterException(String htmlFilePath, String readHtml) {
          final ExceptionMessageBuilder br = new ExceptionMessageBuilder();
          br.addNotice("HTML template cannot contain meta delimiter '>>>'.");
          br.addItem("Advice");
          br.addElement("Body meta delimiter '>>>' can be used by plain text template.");
          br.addElement("HTML template has only its body.");
          br.addElement("For example:");
          br.addElement("  (x):");
          br.addElement("    /*");
          br.addElement("     ...");
          br.addElement("    */");
          br.addElement("    >>>        // *NG");
          br.addElement("    <html>");
          br.addElement("    ...");
          br.addElement("  (o):");
          br.addElement("    <html>     // OK");
          br.addElement("    ...");
          br.addItem("HTML Template");
          br.addElement(htmlFilePath);
          br.addItem("Read HTML");
          br.addElement(readHtml);
          final String msg = br.buildExceptionMessage();
          throw new SMailBodyMetaParseFailureException(msg);
      }
docs: =============