In this project, you will work in teams. Each team will develop a reasonable secure mail transfer protocol. In addition, each team MUST solve section V$.$ During your work in this project, you will learn: $1-$ How to program both clients and servers in a UNIX$-$like environment $2-$ How to allow the server to handle multiple clients using fork function to create multiple processes $3-$ How to reasonably secure your application $4-$ How to identify some possible attacks against your developed protocol and how to enhance this protocol to defend against these attacks