Please turn on automatic private message keeping

[kawishiwi]

Dear Webmaster,
Could you please change the site config to automatically save sent private messages to our sent folders.
I almost sent double messages because of this.
One of contacts had to send a second message to make sure i vot the first one.
In casual browsing I've seen 2 other references to this same issue.
Given that people expect their sent messages to be saved in the sent folder can you change this to be a checkbox to not save to sent folder and make saving the sent message the default?
Pretty please.