Throughout 2014, Gmail automatically downloaded images for emails viewed in a web browser and Gmail mobile apps. This behavior, combined with a change to the way Gmail manages images in email , meant that all opens in Gmail look like they’re coming from the same place —even though some are coming from web browsers and others are coming from mobile apps. All opens from Gmail now fall into the “webmail” category. Because of these changes and the ambiguity of opens coming from Gmail, you’ll hear us referring to “detectable mobile opens,” and showing you how Gmail opens alone compare to opens in desktop, webmail, and mobile. There’s a detailed explanation of the changes to Gmail and how they affect open reporting in our Help Center.