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Be assured you will still be able to find answers to your Yahoo product and app questions on the Yahoo Help website (https://help.yahoo.com). In addition, you’ll be able to find the Yahoo Community moderators on Twitter, responding from our many handles including @YahooCare and @YahooFantasyCC.
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Suddenly text says no email selected and the incoming email has disappeared. This has happened before and I responded before email was deleted. So I wasn’t crazy the email I sent was still in sent but inbox and trash copy was missing???
Is this question about a Yahoo account ending in Yahoo.com, an ATT account (att.net, sbcglobal.net, bellsouth.net, etc.), or some other account?
Are you viewing your account from a laptop, desktop, phone, or tablet? What browser or app are you using to do this? What version of Yahoo mail are you using?
Usually when emails go missing it's because of another program or app the account is being accessed from. Check out this post for more info and how to restore missing emails.
I would definitely go through and secure your account.
Change your Yahoo password and be sure to remove any unknown devices or account that may have been connected to your account. The next article can help with this process.
Find and remove unusual activity on your Yahoo account - https://help.yahoo.com/kb/mail/sln2073.html