Spotlight in Apple OS X before 10.10.2 does not enforce the Mail "Load remote content in messages" configuration, which allows remote attackers to discover recipient IP addresses by including an inline image in an HTML e-mail message and logging HTTP requests for this image's URL.
https://exchange.xforce.ibmcloud.com/vulnerabilities/100527
http://www.theregister.co.uk/2015/01/10/spotlight_caught_spreading_your_delicates/
http://support.apple.com/HT204244
http://securitytracker.com/id/1031521
http://lists.apple.com/archives/security-announce/2015/Jan/msg00003.html
http://heise.de/newsticker/meldung/Datenschutzpanne-in-Mac-OS-X-Yosemite-2514198.html