A minor upgrade to the mailing list software was recently released which fixes a bug that was introduced in the previous version. Some of our mailing lists were affected by this bug, so we are upgrading with short notice.
The upgrade has been applied to a test server with no issues, and we expect the total downtime to be less than 5 minutes.
[Actual downtime was 7:17pm – 7:18pm.]
Resolved as of 2009-01-23 19:18:00