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I suggest you to try adding the sender's email address of those emails in your contacts. Yahoo should no longer send them to spam then.
Click the Contacts icon, select All > Add a new contact. Alternatively, open one of those emails, hover the sender's info and click Add to contacts.
Otherwise, you can create a filter to move all emails from that sender in your inbox. Go to Settings > All settings > Filters > Add new filters and set a rule containing the email address of the sender.
Hope that helps.