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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 haolez on Friday August 20, 2021 @09:35AM (#28245748)
Isn't there a way to verify that the click is coming from GMail? Maybe via User Agent or its IP.
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Re:Gmail is opening and caching URLs within emails without u... by _wldu on Friday August 20, 2021 @09:39AM (#28245787)
The user agent I saw looks like a normal client that a person might use:

74.51.221.37 - - [19/Aug/2021:22:05:16 +0000] "GET /validate/email/1d00a5c2648c211befd33f5a8a7cbfab HTTP/1.1" 404 0 "" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.107 Safari/537.36"

I suppose you could somehow block cache.google.com but I suspect Microsoft and others do similar things.

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