Firstly, to turn keyboard shortcuts on, go to Mail Settings by clicking on the Gear and choosing Settings, then in the General tab find Keyboard Shortcuts and select Keyboard shortcuts on.
Key | Action |
c | Compose new message |
/ | Start a new search (cursor jumps to search box) |
With an email selected (by tick box) or open: | |
l | Open Label menu |
v | Open Move To menu |
! | Report as Spam |
# | Move to Bin |
+ or - | Mark as important / not important |
Shift-r | Mark as read |
Shift-u | Mark as unread |
From an open email: | |
f | Forward |
r | Reply |
z | Undo last action |
Shortcuts for the new Gmail compose (automatically enabled) | |
Shift + Escape | Focus main window |
Escape; | Focus latest chat or compose window |
Ctrl + . | Go to next chat or compose window |
Ctrl + , | Go to previous chat or compose window |
Ctrl + Enter | Send your message |
Ctrl + Shift + c | Add cc recipient |
Ctrl + Shift + b | Add bcc recipient |
Ctrl + Shift + f | Access custom from |
Ctrl + k | Insert link |
down arrow | Move down to previous message |
up arrow | Move up to next message |
n | In a conversation, move down to the next message |
p | In a conversation, move up to the previous message |
Enter | Open currently focused message |
Ctrl + b | Bold |
Ctrl + i | Italics |
Ctrl + u | Underline |
Ctrl + Shift + 7 | Bulleted list |
Ctrl + Shift + 8 | Numbered list |
Ctrl + Shift + 9 | Quoted text |
Ctrl + Shift + l | Align left |
Ctrl + Shift + e | Align center |
Ctrl + Shift + r | Align right |
Ctrl + [ | Indent less |
Ctrl + ] | Indent more |
Here is the original link