User cp
then click list messages
then there is a drop-box that says *inbox"
Click the down arrow and it says "sent items"
ta-da
She/They
Yeah, I only don't like erthtkv2 because of the mod's name. Make it "tkv2," and the mod will instantly become more popular. This is a valid reason as the name of the mod is still an important feature that no one seems to have yet discussed.
Now find the "Thread Display Options" category, and the option to save sent messages by default will be above that.
Click the "Show" button to see a picture of this
All of your sent PMs will now be saved in the Sent Items folder. Unfortunately, I don't believe there's a way to save PMs you've already sent in the folder. As far as I know, your only option is to ask the person you sent the PM to to tell you what it said.