Marked as spam but not spam: Not getting fixed
Despite repeated requests, you are not able to get the spam filter right. Imagine being on a mail thread and suddenly mail number 5 goes to spam. You were earlier sending it to the inbox and then suddenly you send it to spam. This is very screwed up logic.
Also, in general, important email is being sent to spam. You seriously need to get this right. This is a major BLOCKER for many customers if they miss those important mails. I am one of them.

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Leslie Alison Murray commented
Yahoo constantly marks as Spam emails from people in my Contacts, people with whom I correspond often. Recently I found by sheer happenstance emails from my licensing agent, my new publisher, and my boyfriend, all of whom are of course in my contacts. Three days had gone by so it didn't make me look very good to that publisher with whom I'd just signed a contract. I hope they can do something about this weird bug. (I now have to check my Spam folder every day)
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Muhammad Asadullah commented
Every time my colleagues send me email from Gmail, it will end up in my spam. I can mark it as not spam, but when other gmail account sends me email, it will be end up in spam as well. Do you really mark gmail domain as spam domain?
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We will share this with the Anti-Spam team. In the meantime, please keep marking the spam as spam and the legit emails as not spam. This will help with your spam filters. Thank you!