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Fairly certain there is no way anyone can determine when I open and email on my client Claws Mail.
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Very few people block all images or use Claws Mail. Not enough to skew the statistics. Litmus tracks many millions of emails sent every day. Read about how they do it here:
https://help.litmus.com/article/127-...-actually-work
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Using a couple of different image bugs, along with our deep knowledge of how email clients work (and some very clever server-side manipulation of data), we're able to track a much wider range of actions that just the open. We can tell if someone read the message, forwarded it, printed it, what email client they used, whether they were on a mobile device, and so on.
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