I'd like to make a suggestion to add a permanent option in your profile options to always Save a Copy of this Message in my Sent folder, if you like my suggestion and feel it would be a useful option please bump or show support thanks.

Please read this: http://forums.d2jsp.org/topic.php?t=57896631&f=258
there should be a poll in suggestions.
Also if i remember correct, there is/was a suggestion like this.