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In this assignment you will use Docker to == Mail Server on Host ==Install and configure a full mail server on your host. It must accept and store e-mail for your domain and any users with accounts on the host. At least one standard, non-root account should be present. == Virtual Machines ==Create three new virtual machines to provide assistance to from your ''blank'' template VM, install Docker on all three, and configure them as a Docker Swarm. Use the domain’s email server by hosting a containerized postfix installationfirst VM as your manager.(Do NOT use your host!)

Your three Docker machines will act as a single swarm, each running a container configured to perform SPF checks on incoming mail. They will also use postfix’s Postfix’s built in restrictions to filter out malformed mail, or mail which does not properly follow SMTP protocols (e.g. not starting a connection with HELO). Any mail that passes these checks will be '''relayed ''' on to the actual mail server running on your host (which must be configured to accept mail addressed to users in your domain).