Penn also lets you sign up for a lifetime @alumni.upenn.edu address with whatever username you want. Wharton also gives alums a lifetime firstname.lastname@example.org
address so I have two of them.
These are also just forwarding addresses... basically that means that you can't login to the account to check your email, it is just a placeholder or address, not an actual "inbox." So everything sent there automatically gets forwarded to the real inbox of your choice and if you don't choose a place to send the mail, you don't get it. The benefit of this kind of email address is that it never changes and you can use it for the rest of your life, so if you haven't been in touch with someone for a long time, they can still contact you as long as they send it to this address.
I don't know if that made any sense...