Gmail provides several keyboard shortcuts which provides fast usage of it.
But there are 2 undocumented Gmail shortcuts for composing mails.Generally C is the shortcut for composing email but,
b – compose new message and add both CC and BCC
d – compose new message and add CC,
Before using these shortcuts make sure you had enable shortcuts in Gmail’s Setting.Gmail is the only Google service that doesn’t enable keyboard shortcuts by default.
Thanks To Alex Chitu for sharing this….