📨 Incoming Envelope

The back of an envelope, shown coming into an inbox or arriving with motion lines. Commonly used as an icon for an email address. May also represent posting mail or sending messages more generally. Apple and WhatsApp’s designs include an inbox tray. Facebook’s designs feature a yellow envelope angled forward and trailed by three, blue lines, indicating sending. Google's design also previously displayed as a yellow envelope. Apple’s design previously featured three red motion lines, Microsoft’s a rightwards arrow.