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Is there a way to prevent loading of tracking pixels on Mozilla Thunderbird ? I know there's a way to prevent loading images by default but I'd like to be able to load images without having to worry about being tracked. Basically, I'm looking for some configuration setting (or addon) that gives me the functionality of uBlock Origin on Mozilla Thunderbird.

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    If an image (any image) is loaded, and the sender is trying to track their mail, you are being tracked. No tech restricts tracking to one-pixel images.
    – John Deters
    Jul 1, 2019 at 12:34

4 Answers 4

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Thunderbird on Linux, I assume Windows is similar, has 3 viewing settings:

View

Message Body As

  • Original HTML
  • Simple HTML
  • Plain Text

Original will pull from remote locations to include trackers.

Simple will display only embedded content such as attachments or inline pictures.

Plain is text only with no HTML processing at all.

Setting to "Simple" will eliminate tracker loading as well as all remote loads.

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I doubt there is any intelligent blocking on tracking pixel (Web beacon/webbug) for the most email client.

You can choose to block all the image from loading or not. i.e.

Edit >> Preferences >> Advanced >> Privacy >> Block loading of remote images in mail messages.

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Have you tried with a simple firewall rule to block everything but port 25, 465, 587, 993? I.E:

netsh advfirewall firewall add rule name="Thunderbird" dir=out action=block protocol=TCP remoteport=1-24,26-464,466-586,588-992,994-65535 profile=any program="C:\pathToFolder\Mozilla Thunderbird\thunderbird.exe"
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DNS blocking list works to. There i can recomend nextdns.io, is easy to setup and can block trackers.

In my test case: link.getmailspring.com got block by NextDNS Anzeigen & Tracker Blockliste and Steven Black

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