For this assignment, create a design for a secure messaging infrastructure. The solution must have the capability for both e$-$mail and instant messaging. You can choose any system, server, client, and security appliance or software that you know about or can find information about from any appropriate source. Your design may be real or notional. You must explain how it contributes to your e$-$mail system's security and what, if any, drawbacks or limitations it has. Produce a Visio diagram of your logical infrastructure and a one$-$page Executive Summary that explains the major components, their functions, and capabilities$/$limitations$.$ Include protection against spam, spyware, and phishing e$-$mails in your infrastructure.

I need an example of the diagram. I can write it up well enough but using Visio and visually designing it is where I need help. I have to see an example to understand how to create and design it for my specific plan.