Wow… The system now has a script to clear out old mail from the Spam directories. I just ran it and it found nearly 2.25 million old spam messages. Clearing these out not only took care of a ton of garbage files, but reduced the amount of disk space being used by user directories by over 20GB.
So consider this an announcement of our new Spam folder policy. Once per week the system will clear out all messages in the Spam folders that are more than three weeks old. This should allow time to get any real messages that have been mistakenly categorized as Spam out into your main email folder, while not allowing so much cruft to build up.
Please let me know if you have any questions or issues about this new operation.