code: private String createMailToLink(String to, String bcc, String cc,
              String subject, String body) {
          Validate.notNull(to, "You must define a to-address");
          final StringBuilder urlBuilder = new StringBuilder("mailto:");
          addEncodedValue(urlBuilder, "to", to);
          if (bcc != null || cc != null || subject != null || body != null) {
              urlBuilder.append('?');
          }
          addEncodedValue(urlBuilder, "bcc", bcc);
          addEncodedValue(urlBuilder, "cc", cc);
          addEncodedValue(urlBuilder, "subject", subject);
          if (body != null) {
              addEncodedValue(urlBuilder, "body", body.replace("$NL$", "\r\n"));
          }
  
          return urlBuilder.toString();
      }
docs: Creates the mailto-link.
  
  @param to the to-address
  @param bcc optional a bcc
  @param cc optional a cc
  @param subject optional a subject
  @param body optional a body
  @return the link.