Mail annoyances

Dave at The Consultant has written a short rant regarding what he calls "minor annoyances" in Apple's Mail. First, he misses being able to page down from message to message with the space bar, Eudora-style. He also complains about Mail not warning him of invalid addresses prior to sending.

I'll add my own. I've only got two, and they are in fact minor, but they still irk me every time I use Mail. For some inexplicable reason, Command-O will not open a message. Also, I cannot use the arrow keys on my keyboard to move from mailbox to mailbox. It's the little things that drive a person crazy.