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I worked for a short time for an American company. They had periodic phishing test from Mitnick. The links in those emails was not to be clicked as it would trigger a mandatory training. The emails also had a header saying they were a phishing test, so I deleted all those emails in a filter.

The company also ran a mail filter called Baracuda or something similar that followed links in emails to see if they were malicious.

I was quite annoyed when I was called to do the mandatory training as "I" had clicked a link (on an email I hadn't seen) and more so when told I had no other recourse than to sit through it.

I resigned shortly afterwards.

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Did everyone get flagged then thanks to Barracuda? You’d think they’d realize there’s a problem if there’s a 100% fail rate.

Edit: also, to be fair, you basically told them you had opted out of the test, so it’s not completely ridiculous for them to ask you to do the training instead.

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Some of the big providers already do this, notably Apple and Gmail:

https://www.litmus.com/blog/gmail-prefetching-images

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Gmails prefetch is terrible for privacy because it honors http cache headers, which means tracking companies simply use a "no-cache, must-revalidate" header to defeat it.
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That still provides “human” vs “bot” feedback to the sender.

An automated system processing emails isn’t going to be fetching images or rendering attached SVGs.

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I think I might be misunderstanding. Why wouldn’t it? It’s not like the human is manually decoding the SVG or getting the PNG.
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I mean I don't think that's exactly true in the age of LLMs.
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I think this is what icloud does. Seems like an easy way to make tracking useless if every client did it.
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That is still signal that the email address is valid. I'd prefer something like the server immediately sending a SMTP 550 5.1.1 (unknown recipient error), for anything that's immediately recognized as spam (or marked as spam in the past by the user). That gives no signal at all and might even persuade some scammers to remove your email address from their list.
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