Problems delivering to a directory

I'm delivering to a directory and are getting messages with filenames
starting with 'msg.XYZ' where XYZ is a variable.

That was OK (although I would have preferred 001 002 003...

But now I'm getting messages in a sub-directory called 'new' with filenames
like 1009502670.8193_3.khan.peak.org

Any idea:

1) Why this is happening?

2) How to stop it?

I want ALL the messages to get delivered to the SAME folder.

Thanks
TjL

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