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had the same ? and this is what chris sent me...
Sent items are not saved by default.
Option 1: Always click on "Add a copy of this message to my sent items folder" which is located under where you type.
Option 2: Go to your Control Panel and go to Forum Settings and then choose the 3rd tickbox down "Always add a copy of messages i send to my sent items folder." and option 1 will be ticked by default.