It logs you in via "cookies". If your browser is set up to delete cookies after a session is over or when browser is closed, you will not be able to use the auto sign in feature.
Why do I have to sign into Yahoo E-mail every day when I say keep me signed in for two weeks? I do not have it checked to delete session cookies. I did clear out all my cookies and cleaned out the temporary internet files with no help. This problem started after Yahoo did some sort of an update.
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