Shortcuts:
Main
window:
Ctrl-E: Check mail
Ctrl-N: New message
Ctrl-R: Reply
Ctrl-F: Forward
Ctrl-Del: Remove mail (complete)
Tab: Jump between mailbody and mailheader
Space: Load next message
Ctrl-Space: Load prev. message
Viewer:
Space: Load next message
Ctrl-Space: Load prev. message
Esc: Close window