can't open emails on right-hand side of mail page of folders and files
As shown in attached image, emails appear on left-hand (folder) side of screen but when I try to open and access emails they suddenly won't open on right-hand side as they have done for many years. What is wrong?
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Does this happen in all folders? I'm puzzling over your "Copies to Self" folder, which appears to have the "Sent" icon.
I wouldn't call sent items "copies to self"; I'd use that description for messages where I'd put myself as a Cc: or Bcc: recipient.
Some services such as Gmail, don't return self-addressed Cc: copies to you, arguing that since they have already put a message into Sent, you don't need to waste time, energy, bandwidth etc actually sending that message; you already have a copy.
Anyhow, I'm looking for reasons why a Sent folder might not be populated, or why it might not appear to be a valid folder in Thunderbird.