It appears that IMAP may be down. Staff have been notified and will be looking into it as soon as possible.

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UPDATE

[2010-10-07 18:58:45 | Fred A Archibald]

The IMAP server is fixed. A process became wedged and caused the server to become inoperative. Another process that monitors this and should have corrected it also became wedged.

Resolved as of 2010-10-07 18:51:00