code: protected void configure(Properties properties) {
          _properties = properties;
          _recipients = properties.getProperty("mail.smtp.to").split(" *[,;] *");
          _authenticator = new Authenticator() {
              protected PasswordAuthentication getPasswordAuthentication() {
                  return new PasswordAuthentication(_properties.getProperty("mail.smtp.user"), _properties.getProperty("mail.smtp.pass"));
              }
          };
      }
docs: Configures the EmailChannel with given properties.