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I think it caches them the moment the email is sent?
by Ellipsis753 13y ago
I think it caches them the moment the email is sent?
- nitrogen 13y agoThat is only possible if the URL is identical. If senders use unique URLs per recipient, Google could guess at which images are identical based on surrounding e-mail content, patterns in URL components, and/or statistical sampling of some of the URLs, but a 100% accurate deduplication would either require identical URLs or a lot of bandwidth to read 100% of URLs.
- MichaelGG 13y agoWell Google already crawls a ton of URLs so it's hard to imagine bandwidth being a major issue, right? Even the same URL can return a different image. That wouldn't be super useful for tracking, but they can only truly dedupe if they read every response.