When Yahoo! and Gmail cache images, it means that they download this data, store it on their own servers and then "serve" it to their webmail users. A cache in computer science refers to the "memory cache", which is a temporary copy of data to facilitate future access. Let's go back for a moment to the story of the "cache" of images. Not to mention a few other more confidential webmails and email clients that have made a specialty of protecting their users' privacy ( Hey, ProtonMail.) or extensions allowing to block tracking ( Ugly Email, PixelBlock, …). Since December 2013, Gmail " cache "images contained in emails, in March 2018, it was Yahoo! that joined the movement. This movement is the growing restrictions on email tracking and more specifically on tracking of opens. There is an underlying movement that is taking hold in the (not so) small world of email marketing.
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