The saving of messages in the sent folder is something usually done by the email client, and not the server.
I don't know anything about how you have coldFusion set up to send the email (smtp?), but it would need to also store a copy in the sent folder, if that is what you desire.
As an alternative to smtp for sending the email, you can utilize the Zimbra SOAP API to send the message (see https://files.zimbra.com/docs/soap_api/ ... ndMsg.html
). By default, this will store a copy of the email in the user's 'Sent' folder unless it is overridden with the 'noSave' attribute.
Hope that helps.