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My teenage children only use email when they are forced to such as when registering to use a website. (and then they might use 10minutemail.com to register)
Most teenagers communicate through IM, SMS, Facebook, Google+, Skype, and Tumblr.
They probably don't want another email address provided by the school as it is just going to be one more thing they will have to remember to check.
I agree with Marc - schools should let cloud services provide email accounts. Although I don't thinkl they even need them.
Some computer savvy teachers in our city use forums to communicate with students and their parents.
Parents are interested in finding out what is going on in the school and for that our school system invested in an Instant Alert system which sends messages via SMS, telephone, and email. (report cards were issued on, there's a meeting on..., school is cancelled due to inclement, your child was marked absent, etc.) It's a very efficient system.