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I'm pretty sure gmail caches everything to prevent anyone from getting useful data from this.
by edrxty 6y ago
I'm pretty sure gmail caches everything to prevent anyone from getting useful data from this.
- dheera 6y agoNo, they don't. This spy pixel crap is exactly how privacy-invading tools like Superhuman get read receipts. Some even show the city and country that the e-mail was read from by GeoIP-reversing the IP address that accessed the pixel. This practice needs to be ended, and IMO is a far worse violation of privacy than GDPR or anything else people are making noise about today.
- tyingq 6y agoGmail does say they use image proxies. Is there some specific way those tools are getting around this? Just unique image names per sent email? https://gmail.googleblog.com/2013/12/images-now-showing.html https://gmail.googleblog.com/2013/12/images-now-showing.html
- dheera 6y agoI wasn't aware of the proxy, so I may be wrong about the GeoIP aspect, but it's possible other mail clients don't proxy, so it's something to be wary of nonetheless. They use unique URLs for each e-mail and recipient, so when the proxy makes the request, they can trace it down to which exact e-mail was opened.
- mdasen 6y agoGmail doesn't cache things. It does proxy them. So, they can't read or write cookies, but given that spy pixels contain unique URLs, they are able to determine things like opens.