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A comment on Gmail is opening and caching URLs within emails without user intervention (2019). Parent comment

Re:Gmail is opening and caching URLs within emails without u... by avereveard on Friday August 20, 2021 @02:19AM (#28243207)
I've had a lot of grief from a few users' Exchange doing it (likely as part of some anti phishing plugin of sorts), to the point we changed validation links from one time to sort lived.
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Re:Gmail is opening and caching URLs within emails without u... by raxxorrax on Friday August 20, 2021 @08:32AM (#28245278)
Don't know why you are downvoted. Many corporations and institutions employ sandboxes to check mails and the links contained in them. This is a standard security practice by now.

So a link that is only valid once would be affected. Restricting the validity by time is a good way to solve this while still maintaining decent security.

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