<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">What about for email items that already have a 1x1 IMG tag placeholder, or do advertisers never do that?<br><br><div dir="ltr"><span style="background-color: rgba(255, 255, 255, 0);">-JPH</span></div><div dir="ltr"><br><blockquote type="cite">On May 29, 2021, at 17:32, Steven M. Bellovin <smb@cs.columbia.edu> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr">
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<div><div class="plaintext"><p dir="auto">On 29 May 2021, at 17:30, Randy Bush wrote:
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<blockquote><blockquote><p dir="auto">3. Is it possible to disable image tracking for 1x1 image by default,
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even if I choose to load the images?
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</blockquote><p dir="auto">yes, please
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</blockquote><p dir="auto">I don't see how that's possible. It's the attempt to do the download
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that leads to tracking: a web server somewhere sees a request for
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the tracking URL; whether or not anything is shown is irrelevant.
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And until you download it, you don't know that it's 1x1. I suppose
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someone could set up a server that collected the hostnames or
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URLs that served up these things, but uploading to the site is also
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tracking, though presumably we'd trust it more.
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<p dir="auto"> —Steve Bellovin, <a href="https://www.cs.columbia.edu/~smb">https://www.cs.columbia.edu/~smb</a>
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