Issue with your server
Some of my email are not showing in my inbox https://mail.yahoo.com/. These emails were not deleted, spammed or archived. The emails existed in my inbox. For example 9 December 2024 emails. This is not browser related issue. It is clearly your server issue. I tested with Edge, Chrome, Incognito and the issue remains.
whether I use the search or scroll to the entire inbox to locate the emails around December 2024, I don't see some of the emails.
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