log out button is gone
The log out button is now gone from mail. That's just downright sleazy, Yahoo, trying to force your users to stay logged in.
The post here https://yahoo.uservoice.com/forums/600772-new-mail/suggestions/35739640-where-did-the-log-out-link-go-how-do-i-log-out-of has the same complaint. The "response" from the admin was to look in the profile menu in the top right BUT THAT"S WHAT MISSING. It used to be there, but it's not there anymore ...
I wish I could upvote that issue and comment there, but it seems I cannot so I am creating a new issue.

Hi there,
Thank you for reporting this issue, it should now be resolved. Please let us know if issue is not resolved for you.
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Mail Support
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James Rath commented
After several more logins where the logout was missing, now all of a sudden it's back again.
If you're A/B testing users with and without the logout, please stop. It doesn't take that long to detect a result with so many users out there.
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James Rath commented
Aaaaand now it's gone again. Sigh.
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James Rath commented
And now magically, mystically the profile menu is back. Did someone roll back the change?