I won't mark messages as read when I only saw them as a preview. How can I do this, then they are only marked as read when actually open?

any other e-mail client, I used allows me to mark a message as read only when I double click and read. and not only when I spotted it.

This isn't my product. Perhaps inform you and learn that this forum is composed by users of Thunderbird.

Tags: Thunderbird

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