Recently there was an outage on the IMAP server, the administrators notified of a glitch of some kind which had the IMAP zone rebooted and caused an outage for a few minutes. It is now back up and running.

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UPDATE

[2009-05-27 15:59:55 | Michael G Bordua]

There continue to be some unexpected problems with IMAP.

These are causing short outages as the server reboots.

These should be fixed this evening with the SAN maintenance.

Resolved as of 2009-06-11 08:24:00