Step 1: Login to your webmail with horde interface.
Step 2: Click on the gear icon near the top of the screen
Step 3: Select Preferences, followed by Mail.
Step 4: In the Compose column, locate and click on Sent Mail.
Step 5: In the Save attachments in the sent-mail message? field, click on the drop-down field and select Save attachments.
Step 6: Click on Save.
