This logo was used from iPhone OS 1 to iOS 6 in August 2013. At this time, The icon looked like a letter was in the sky.
This logo was used since the launch of iOS 7 in September 2013 to the launch of iOS 11 in September 2017. The sky background was changed to a gradient background.
Icon first used in iOS 11 Beta. The gradient became darker, and the envelope became slightly larger.
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