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Minor phrasing fix.
=== Specifying Which Domains are Used to Send Mail Messages===
As of last lab, both of your email servers are sending mail addressed from users of the machines themselves. This would be confusing for the receiver who might get emails from the same user @vm1, vm2, and vm3. Which would they respond to? To avoid this, we can make all servers make the sent mail appear to come from a common location (usually the domain), and make incoming email sent to that address accessible from machines inside our network.
Look at the email messages you sent between your vm2 and vm3 in lab 4a. Notice that each is addressed from root on whichever machine sent it.
