Adds a compose email button in the Mail area so users can start a private message from the top menu. This makes it easier and faster to contact someone directly without navigating through extra screens.

... someone
https://www.odoo.com/web#id=10411&view_type=form&model=project.task&menu_id=3942&action=327
pad: https://pad.odoo.com/p/r.seEjnoFNWnLPalE7