Yahoo! Do better at preventing spam emails!!!
I erase and block about 25+ emails a day. I don't have this problem with gmail??? You could do better to prevent this from happening!
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Are these legit junk emails or newsletter/promotional type emails from stores, etc? Big difference. For legit spammy emails, please "mark as spam" instead of deleting. For other coupon/promotional type emails like from stores, unsubscribe, at one point (even if you don't remember) you subscribed to these emails. Hope this helps!