3 ms·

google already grabs the images via image proxy.. http://gmailblog.blogspot.com/2013/12/images-now-showing.html http://gmailblog.blogspot.com/2013/12/images-now

• ibejoeb 12y ago
  Unique images still allow for read receipts. The proxy effectively prevents cookie setting, ip address determination and geolocation, and injection-type attacks.
  • geofft 12y ago
    If Google proxies and caches images at the time of receipt, instead of when you open the email, then you effectively don't have read receipts for Gmail users, because it looks like they all read the email immediately. Caching images immediately is probably an attractive engineering decision on its own merits. Whether spamming read receipts is good (because it makes them useless) or bad (because it makes people think the emails got read) is an interesting question.