<P> OS X Mavericks threw out the capability of displaying the plain - text version of MIME multipart / alternative messages, and the option of doing so by default . Users were stuck viewing the HTML or rich - text version of multipart / alternative messages . </P> <P> In OS X Yosemite, Mail supported new features such as: Markup (inline annotation of PDF or image files) and Mail Drop (automatically uploads attachments to iCloud, and sends a link in the message instead of the whole file). </P> <P> In OS X El Capitan, a filter was added to the message list to filter by various options such as Unread, Flagged, or messages with attachments . The conversation display was also redesigned and various disk space saving optimizations were implemented . Streaming notification support for Exchange accounts was also added . </P>

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