Network
The network layer is the layer that is external to the physical host and operating system on which the Messaging Server or one of its components is running. It is surprising to see in this day and age of reasonable paranoia regarding basic network security how many customers are not actually deploying even the most basic network security measures such as firewalls. You may be saying, “of course we have a firewall!” OK, but is it just there for traffic between the Internet and your organization's network? Or do you have several layers of firewalls, including a layer protecting mission-critical systems such as your messaging system?
Why use firewalls for the Messaging Server? Even under the most complex configurations, roughly half a dozen ...
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