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Cool, all of your images are getting fetched by the server as it receives and processes the emails. You have 100% open rate on all emails to that domain within 3 minutes of send.
What do you know about the user and their behavior? Nothing. The prefetch is not tied to their actions, therefore you cannot learn anything about their actions.
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This post isn’t about email open rates, it’s about data exfiltration. But for email speficially, show me major providers that prefetch by default.
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