When you send an email to Manana, it doesn't leave your computer - Manana puts it an Outlook folder called Manana Mail. You can find it there any time, and move or copy it back to your inbox if you need it.
Manana also makes a folder called Manana Sent. If you choose to have Manana forward your Manana mail to you, Manana moves the original email to the Manana Sent folder once it has been forwarded. Manana doesn't need emails in the Manana Sent folder - you can keep them there, or file them somewhere else.