Catch-all as garbage account

Something has changed. I used to be able to set up catch-all as a garbage account. No more, though my old ones are still working. Any ideas why?

What would the point of that be? To prevent bounce messages from being generated for unconfigured addresses?

Yep. 1) Prevent backscatter from spam. 2) Reduce probing for valid addresses. 3) Satisfy some people’s insistence that I have a postmaster/abuse/etc. address for the domain.