docs: public static void send(MailAccount mailAccount, Collection<String> tos, String subject, String content, boolean isHtml, File... files) {
  		Mail.create(mailAccount)//
  				.setTos(tos.toArray(new String[tos.size()]))//
  				.setTitle(subject)//
  				.setContent(content)//
  				.setHtml(isHtml)//
  				.setFiles(files)//
  				.send();
  	}