1. Log in webmail by using URLs:
http://www.YourDomain.com/webmail/ or http://www.YourDomain.com:20952. Select the Setting Icon and go to Preferences then click on Mail on the top function as below.
3. Select Sent Mail under Compose.4. At Save attachments in the sent-mail message? Select Save attachments as per below:
5. Click Save to save the setting.