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A comment on What's in email tracking links and pixels?. Parent comment

Re:What's in email tracking links and pixels? by willis936 on Thursday June 10, 2021 @07:21AM (#27459392)
In case anyone is using protonmail and is curious about this: by default only DNS prefetch with the server's IP is leaked. Opting to load remote content leaks the reader's IP when grabbing CSS.
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