try {
      email.setHostName(host);
      email.setSmtpPort(port);
++      if((username != null && username.trim != "") || (password != null && password.trim != "") {
--      email.setAuthentication(username, password);
++        email.setAuthentication(username, password);
++      }
      email.setTLS(withTLS);
      email.setFrom(from);

      String[] addrs = StringUtils.split(to, '\n');
      for (String addr : addrs) {
        email.addTo(addr);
      }
      email.setSubject(getSubject(project));
      email.setMsg(getMessage(project));
      email.send();
    } catch (EmailException e) {
      throw new SonarException("Unable to send email", e);
    }