When I delete an E-mail, I expect it to stay deleted, not show up again at some later date.
Is this a Yahoo thing or a Google thing? Either way it's an annoying surprise.
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If you still find that the issue is happening, please see this help page for troubleshooting:
help.yahoo.com/kb/sln2891.html
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Anonymous commented
Why does this happen? I had about 250 emails, now yesterday when I woke up I had close to 1,700 emails back from Jan-today? What in the world?