Email account expiration is different for every school. Below is a brief summary, including links to individual school computing help pages.
SEAS
If you are a May graduate, your account will expire the October after graduation (6 week warning).
SEAS email address should continue to work as long as you have a forwarding
address on the Penn alumni system (i.e., @alumni.upenn.edu — see QuakerNet
to set up a forwarding address).
Once your SEAS account has been deleted, mail will only be forwarded. All other special features, such as Spamblock and other filtering, will no longer apply.
Set up forwarding address as follows so that mail sent to SEAS will immediately go to the alumni forwarding system, then the ISP account.
Get an account from an ISP in your local area. Make sure it works.
Sign up for alumni email forwarding to your ISP account through QuakerNet.
Set your SEAS account to forward to your alumni address by visiting www.seas.upenn.edu/accounts. Choose "configure your email account" and "mail forwarding".