I add my clients to an address book list and sort messages from them into a smart mailbox using the "Sender is in group" rule. However, I would like to find a simple way of sorting messages that I write to these people into a mailbox. I cannot find an equivalent "Recipient is in group" rule. The only work around I have found is to add addresses one by one as individual conditions for a smart mailbox. Is there a better way? How do I convince Apple to incorporate this (seemingly simple) feature into a future release?