docs: public static void send(MailAccount mailAccount, Collection<String> tos, Collection<String> ccs, Collection<String> bccs, String subject, String content, boolean isHtml, File... files) {
  		final Mail mail = Mail.create(mailAccount);
  		
  		//可选抄送人
  		if(CollUtil.isNotEmpty(ccs)) {
  			mail.setCcs(ccs.toArray(new String[ccs.size()]));
  		}
  		//可选密送人
  		if(CollUtil.isNotEmpty(bccs)) {
  			mail.setBccs(bccs.toArray(new String[bccs.size()]));
  		}
  		
  		mail.setTos(tos.toArray(new String[tos.size()]));
  		mail.setTitle(subject);
  		mail.setContent(content);
  		mail.setHtml(isHtml);
  		mail.setFiles(files);
  		
  		mail.send();
  	}