itwbennett (1594911) writes "The potential privacy risk in Apple's OS X Yosemite, first reported by German tech news site Heise and confirmed by IDG News Service, appears when people use the Spotlight Search feature, which also indexes emails received with the Apple Mail email client. Performing a Spotlight search opens email previews that load external images, including tracking pixels that are used to gather data, even when the Mail client is asked not to do this." From the article: A preview of the unopened emails was shown by Spotlight, which revealed to the operator of the server hosting the pixels the receiver’s IP address, current OS version and some details about the browser used as well as the version of Quick Look, a program that let’s users preview a document.
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