Message Viewer Keyboard Shortcuts
'r' - Reply (opens compose screen ready to reply)
'l' - Reply all (opens compose screen)
'f' - Forward (opens compose screen)
'_' (Alt-u) - Mark message unread
'n' - Next message
'p' - Previous message
'Fire' - Open current link
'Del' - Delete
't' - Scroll to the top of the message
'b' - Scroll to the bottom of the message
'space' - Page down
'v' - Page up