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Thunderbird or Firefox seems to block ALL tracking links from CONSTANT CONTACT

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BarryW
BarryW
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Thunderbird seems to block ALL tracking links from CONSTANT CONTACT (specific return tracking server is r20.rs6.net--see copy of error message attached). Configuration: Windows 10, Thunderbird 115, Firefox 123. Ublocker was Firefox extension but issue continued with Ublocker uninstalled. Bit Defender & Bit Defender VPN tested installed and uninstalled. Also tried various configurations of Firefox and Thunderbird settings/privacy & security.

Thunderbird seems to block ALL tracking links from CONSTANT CONTACT (specific return tracking server is r20.rs6.net--see copy of error message attached). Configuration: Windows 10, Thunderbird 115, Firefox 123. Ublocker was Firefox extension but issue continued with Ublocker uninstalled. Bit Defender & Bit Defender VPN tested installed and uninstalled. Also tried various configurations of Firefox and Thunderbird settings/privacy & security.
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cor-el
cor-el
  • Moderator
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That domain is blocked by Firefox Enhanced Tracking Protection.

You can check for issues with Enhanced Tracking Protection. Firefox shows a purple shield instead of a gray shield at the left end of the location/address bar in case Enhanced Tracking Protection is blocking content.

  • click the shield icon for more detail and possibly disable the protection

You can check the Web Console for relevant-looking messages like blocked content.

cor-el
cor-el
  • Moderator
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Try to changek DNS over HTTPS to "Max Protection".