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Is it possible to do this:<br />
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Email in Lan -&gt; SMTP Server -&gt; ISP and visa versa?<br />
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Will the SMTP &nbsp;server keep the emails separated so they go to the right internal mail box?
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Is it possible to do this:

Email in Lan -> SMTP Server -> ISP and visa versa?

Will the SMTP  server keep the emails separated so they go to the right internal mail box?

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I have heard that you can use a linux box to 'scrub' mail and internet traffic to help protect from viruses and other 'bad' things. &nbsp;If this is possible, &nbsp;how does one do this and how can I get started?
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I have heard that you can use a linux box to 'scrub' mail and internet traffic to help protect from viruses and other 'bad' things.  If this is possible,  how does one do this and how can I get started?

How can I utilize Linux to protect my Windows based LAN

Operating system security (OS security) is the process of ensuring OS integrity, confidentiality and availability. OS security refers to specified steps or measures used to protect the OS from threats, viruses, worms, malware or remote hacker intrusions. OS security encompasses all preventive-control techniques, which safeguard any computer assets capable of being stolen, edited or deleted if OS security is compromised, including authentication, passwords and threats to systems and programs.

OS Security

The Linux operating system, in all its flavors, has its own share of security flaws that allow intrusions, but there are various mechanisms by which these flaws can be removed, generally divided into two parts: authentication and access control. Authentication is responsible for ensuring that a user requesting access to the system is really the user with the account, while access control is responsible for controlling which resources each account has access to and what kind of access is permitted.