Account based Save copy of sent messages to "Sent" folder

I currently have multiple e-mail accounts. I want to save a copy of any e-mail I send in my sent items folder. I have one account that will no do that automatically, the other accounts automatically save to sent. Would it be possible to have an account based “Save copy of sent messages” on a per account basis?

We do have this option per account in version 9. Go to Menu > Accounts and click on the General tab for the account.

Note that this option is not available for Exchange or Google Workspace/Gmail accounts.