ADD SAFE/TRUSTED SENDERS LIST
Currently, you have THE WORST spam filtering on the entire Internet. I've looked... I know. I have lots of email accounts with different vendors... Google, Microsoft, Earthlink. Yours is THE WORST. You need to add a TRUSTED SENDERS list so that at least you stop sending my emails to spam. You will never be Google.

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Parke Pettegrew commented
With the huge amount of data leaks I’m seeing an extra 10-15 emails a day that are spam that are getting through your spam filters or ones I have already blocked. Please review and get rid of all of these - they are easily caught with spelling errors, font errors and formatting that makes them look childish - I have been with Yahoo for over 25 years but might change if this doesn’t get better