Make it so that spam filtering, and/or user defined filters actully work.
"While 99.9% of spam, malware and phishing emails are being caught by our spam filters..." SURELY you must be joking. I get literally 50 obvious spam messages per day, i.e., Yahoo is 1000 times worse than any other email service I have including for those where I perform spam management personally. Your spam filtering is at best less than 1% effective (i.e., it is completely ineffective)....
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