All hotkeys - Yahoo! Mail Hotkeys

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c	Compose	Allows you to compose a new message.
/	Search	Puts your cursor in the search box.
k	Move to newer conversation	Opens or moves your cursor to a more recent conversation.
j	Move to older conversation	Opens or moves your cursor to the next oldest conversation.
n	Next message	Moves your cursor to the next message.
p	Previous message	Moves your cursor to the previous message.
o or <Enter>	Open	Opens your conversation. Also expands or collapses a message if you are in 'Conversation View.'
u	Return to conversation list	Refreshes your page and returns you to the inbox, or list of conversations.
y	Archive* Remove from current view	Automatically removes the message or conversation from your current view.
x	Select conversation	Automatically checks and selects a conversation so that you can archive, apply a label, or choose an action from the drop-down menu to apply to that conversation.
s	Star a message or conversation	Adds or removes a star to a message or conversation. Stars allow you to give a message or conversation a special status.
!	Report spam	Marks a message as spam and removes it from your conversation list.
r	Reply	Reply to the message sender.
a	Reply all	Reply to all message recipients.
f	Forward	Forward a message.
<Esc>	Escape from input field	Removes the cursor from your current input field.
d	Delete message(s)	Why Gmail doesn't have this shortcut?