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> So, I guess I won't know if 10% open my marketing emails or 50%.

You didn't know before either since many mail programs block tracking pixels. This was always garbage data to a large extent.

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Gmail doesn’t (kind of), and that’s a big enough slice of email users these days...

Doesn't gmail load images when the email get to the server and not when the email is opened? (That is at least what some who know more about email than I do say) So the only thing tracking pixel really have shown is if the user uses gmail or not

Nope, the image loads when the email is opened by the unique recipient.

Only for the US market, outside of that there are lots of mail providers which are instead used. GMail addresses are a scarcity in Europe.

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