UPDATE
[2008-04-14 16:57:08 | Eric Fraser]
Web email access is currently working at:
https://imap.eecs.berkeley.edu/
connecting directly to the IMAP port from your email client is still not working, however.
UPDATE
[2008-04-14 17:25:24 | Eric Fraser]
The passwords for proxy authentication were corrupted and were rebuilt from scratch.
Resolved as of 2008-04-14 17:24:00