I used to have a rule that if the subject contained Delivered: or Read:
Outlook would file it in my Receipts folder (which I created a long time
ago) automatically. It worked up until about 2 weeks ago. Suddenly, it
stopped filing. I checked with our IT department, and they said they
hadn't made any changes to Outlook.

I note that if I right-click on a Read or Delivery receipt that Create
Rule is grayed out.

Anyway, a rule is probably not the best way to handle this, as someone
could create a subject line containing "Read:" somewhere in it and it
would go into the receipts folder. (false positive)

So from the Outlook Help I learned I could set:

Tools Options Preferences tab E-mail Options Tracking Options

Checked: Process requests and responses on arrival
Checked: Process receipts on arrival
Checked: After processing, move receipts to: Receipts

However, the receipts arrive and sit in my inbox instead of being filed.
How do I fix this?

I am on Outlook 2003 (11.8010.8028) SP2.

TIA,
Charles Belov