Emails disappearing from inbox
I received a couple of emails from a sender, I was able to read the email using browsers (Yahoo! Mail Web) both on Safari and Mac. Then the email suddenly disappeared. I asked the sender to send the email again, I was able to read it and then it suddenly disappeared again. After calling Yahoo! Mail Pro support, they were able to recover lost email (agent wasn't able to explain what does that mean), I was able to read the email again and after few seconds the email disappeared from my inbox.

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Karl Hambrecht commented
18 months of my sent emails have mysteriously disappeared. Yahoo Mail Pro support blamed it on my using a mail server other than a Yahoo app (my iphone Mailbox) I am not a techie but that makes no sense. How could the Apple Mailbox server extract ALL of the sent emails from18 months ago up to 3 weeks ago, from the Sent folder on the Yahoo server and move them to a different folder (maybe Spam or Trash?) that then gets deleted? After 25 plus years, I am done with Yahoo mail.