Poor spam interception
Yahoo seem very poor at identifying obvious spam and when they do they send it to the spam box rather than permanently deleting it, leaving us to clean up their failures. I get casinos, marketing, dating sites all with very obvious formats that I have never had any dealings with. Step up and do better Yahoo - assuming that anyone from Yahoo actually reads these.
1st
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Please make sure you are marking these emails as spam instead of just deleting. Also, if they are newsletters please make sure you unsubscribe from these. We will also share this with our anti-spam team. Thank you!