Webe using the '''ll use Postfix ''' application as the '''MTA''', and we'll set will be setting it up on your '''vm2'''machine. This will be act as the email server for your internal network. You'll will be able to send email out of your network, and receive email from within your network, but you will '''<u>not </u>''' receive email from outside of your network becausedue to the following reasons:# Outsiders Individuals outside of your domain will never find the MX recors for your domain, records because there are no '''.org ''' servers pointing to your DNS server (i.e. you haven't paid for it).# Even if they did - the individuals could read your MX records, your local network is using IP addresses on a '''private subnet''', which is not routeable on the internetInternet, so it cannot be reached from the outsideof your system.