November 3rd: We have completed upgrading SpamAssassin on all our production servers from version 2.65 to 3.0.1

The new version provides significantly improved spam detection because SURBLs are now used. Basically, this means that URLs used in the message body are checked against real-time blacklists.

As an example, messages to support@baremetal.com which score over 10 in SpamAssasin are thrown away unread. (10 is _double_ the default threshold of 5, so this is quite a conservative threshold.) Since the update, the number of spam messages being tracked in our support system has fallen from about 130 per day to about 30! :-)