Dear All who have been receiving duplicates plus more:
I emailed Yahoo this morning (USA Eastern time) and at least in my inbox the duplicates have stopped this afternoon.
For those of you who have Yahoo email accounts you can access a form to report problems with Yahoo Email at: (not sure if this will make a direct link}
This page can be found by clicking on "Help" in the top right hand corner of your Yahoo email page and select "contact" and then "contact with feedback."