Secure Login / Browsing Data
After deleting browsing data on Chrome, the user is able to continue read and open emails in a Yahoo mail browser tab. Only when refreshing the browser tab, the page goes to Login window. Thanks.
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If you're having account or sign-in issues, please contact our Customer Care team at help.yahoo.com. They are separate from the Yahoo Mail team. They resolve these types of issues and have the tools to help. Hope this helps. Thanks!
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SME commented
Try to replicate it again. When we reset or clear the cookies and other sites data, there is a warning that says "Signs you out of most sites". This is default by web browser not the yahoo site.