Hello there. New here

just wondering where to send Yahoo! Mail bug reports.
Reps at mail-classic-errors@cc.yahoo-inc.com are very kind but focusing on my account.
I’m actually trying to report a bug in search functionality that started 3-4 months ago.
It involves simple search queries failing to match message subjects; bodies etc.
The problem is sporadic and so I can only offer so much of my own knowledge to help.
All I’m trying to do is get some simple screenshot PDFs to the right people at Yahoo! .
My hope is that then they can look at their scripts and fix the bug as any other team does.
As simply as I try; offering advice on why I believe it is sporadic I think is too confusing.
But considering that I am using the service to send (quite a few) job apps; it is distressing.
As a long time developer I’m just trying to recognize what seems to be a certain bug.
Thanks for any help,
Nathaniel