Short Answer:
As an SUU student you automatically get an suumail.net email address, this email also has a .edu alias.
david@suumail.net is equivalent to david@students.suu.edu
Long Answer
There are some vendors that offer discounts to students with a .edu email address. Amazon.com for instance. When you sign up for an suumail.net email address, you automatically get a .edu address as an alias. So if your SUUMAIL email address is david@suumail.net, your .edu alias would be david@students.suu.edu. In other words, if someone sends and email to david@students.suu.edu, it will be delivered to your david@suumail.net Inbox.