Have a look at this bug for instance:
https://bugzilla.redhat.com/show_activity.cgi?id=531343
It was closed two months ago as "WORKSFORME", still ABRT adds more and
more users to the Cc-list.
Obviously something is not working for someone, but ABRT seems to ignore
the fact that the bug is closed when adding Cc-s.
Rgds.
Ola (T)