We are currently using Chilkat in some of our programs. When you send an email via outlook, a copy is put in the sent folder. This does not happen with Chilkat. Is there a way I can change this.
No, because MS Outlook is an email client. Email client communicate with email servers, not other email clients.
See this Chilkat blog post for a more detailed explanation: http://www.cknotes.com/?p=29