Server software updates

Over the next few weeks the software running on all the servers will be upgraded to Debian 7. This should be uneventful, insofar as users are concerned, but please let me know if you find something that isn't working as expected.

Update: ash has been upgraded. [2013-07-23]

Update: oak has been upgraded. [2013-08-22]

Update: The issue with authenticating to send emails from outside of the network has been fixed. [2013-08-27]