The machine serving as a web and database server for both services needs to be patched and rebooted. Total downtime should be less than 30 minutes. Any messages sent to one of the Sympa mailing lists during this time will be queued and delivered once service is restored.
UPDATE
[2008-02-27 23:29:23 | Emrys Ingersoll]
Patching went as planned and both services are operational once again.
Resolved as of 2008-02-27 23:20:00