[Evolution] How do I stop evolution from duplicating sent items?

[Russell Thamm <russell thamm hotmail com>]

When I send an email, my provider places the item in the Sent folder.
Evolution also insists in putting the item in the Sent folder. 
Furthermore, Evolution always takes several minutes to do this.

Can I configure this Evolution to stop duplicating sent items? 

I'm sick of rebooting to Windows every time I want to send email.