In a move that's expected to affect tens of people, Sprint has announced it will no longer offer PCS Mail after Dec. 31. As such, any @sprintpcs.com e-mail accounts will no longer work.
The shutdown isn't all that surprising - does anyone actually use their carrier account? - and should be an obvious savings for Sprint, which lost $344 million last quarter.
If you do actually have an @sprintpcs.com account, there are instructions to help you set up and transfer to a new account, such as Gmail, Yahoo or Hotmail - which is a downright nice thing to do and is a positive move for a company with notoriously bad customer service.
Edit: Updated to note that the shutdown only includes @sprintpcs.com e-mail, and that Sprint Mobile Email is still available.