nnfolder total-expire like behavior

[Jerry Sievers]

Hello.   On Gnus 5.7.

I am using an archive folder nnfolder type to store copies of outgoing
messages.  I had thought that by setting the group parm total-expire
. t the messages would be flushed after a week or so.

Closing the group and it says "expiring messages" but this doesn't
actually get rid of them the way it  does for nnmail groups.  

I find that I must manually delete these messages to get rid of them.

Any ideas how I go about having this done automatically on group exit?

Thanks
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