A firewall system generally controls what TCP/IP interactions are allowed between the external world, considered to be unsafe, and an internal, protected environment, considered to be safe. The messaging component of a firewall could include many or all of the following components: Spam protection, Protection against denial of service attacks. Provide for address rewriting. Control of who can send mail into and/or out of the firewall. Filter mail on content, for example scanning attachments for a virus. Limit internal information exposed to the external network Provide substantial logging facilities for tracing.
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