I have followed the advice I've found with regards to creating a copy of a
message that I've sent in the imap server's sent items folder.
I turned off the option to save a copy in the sent items folder.
I started with a blank rule and selected the option to move a copy of a sent
item to a specified folder. I selected the sent items folder.
When I send a message, I get a rules error dialog box that says "cannot copy
to the sent items folder." There is no reason provided.
I can manually drag and drop items from the local sent folder to the imap
sent items folder.