MOVE BACK TO SENT FOLDER
Something happened that moved an e-mail I just sent to the Trash folder.
I WANT TO MOVE IT BACK TO THE "SENT" FOLDER.
I used to be able to do this, now this option is missing.
User should be able to move their e-mails to ANY FOLDER THEY WANT, including BACK TO THE SENT FOLDER.

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Gabriel Nivasch commented
I contacted Yahoo. They said it's currently not possible to move an email back to the Sent folder, and they suggested re-sending the mail to oneself so that it shows up again over there.
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Christopher Ashkan Adell commented
If a user moves an email out of the "Sent" folder, the email cannot be moved back in. This is a bug.
Yahoo should allow users to move emails both in and out of the "Sent" folder (like any other folder).
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Paula Harris commented
I am also unable to move an e-mail back to the Sent folder. I don’t understand why that folder is not listed when you select the Move option.