Nearly every webmail I have ever used has a "Copy" function to copy an email to another folder.
I cannot seem to find this in Smartermail (let me know if I'm wrong !).
I am constantly forwarding emails to myself so I can have a copy in a different folder (archives, templates etc).
Could you please add a "Copy" function to the Action drop down. It would be the same as "Move" but leave the original in place.