I would like a third option in Preferences under mail> composition:

"Prompt when sending> Save/ Don't save in sent folder"

The present options are:
Save sent messages and
Don't save sent messages.

I know i could keep the second : "don't save sent messages" and cc to myself messages I want to save. But 1) I may forget, 2)it isn't as smooth, 3)It gets saved in your inbox, probably as a new message (adding to the unread message count).

What do others think about this suggestion? I hope its easy to implement.