@Override
  public void processSystemwideNotifications() {}
Sends an email to the configured recipients using configured email server. The given message
will be the email body. NOTE: the check whether email notfication is enabled or not should done
using {@link #isEmailNotificationEnabled} before calling this method.

@param subject subject of the email
@param message message body of the email
geode-core/src/main/java/org/apache/geode/admin/jmx/internal/AdminDistributedSystemJmxImpl.java