Ο envelope of Gmail is one of the most recognizable app logos of all time. This will change shortly for a much more different logo:
See:
It's just an M! from Mail, but it has more colors Google. It looks like an envelope, but it's a little more abstract.
The change comes as part of the redefinition of G Suite in Google workspace and will be released to users “in the coming weeks”. The Drive, Calendar, Meet, Docs, Sheets, and Slides apps will also get a new look: