hmmm... the only inbuilt feature is who sends the email into the library. This would require instant forwarding on the server level to the library. Othewrwise it will take the metadata from the user who then sends the email into the library.
Enable email --> Edit view and display Email From and Email To. (I beleive the to will always be the sharepoint list however)
Will most likely need a custom event handler or something along those lines to get what you need.