Step1: Visit the Webmail interface and choose Horde.
Step2: Click on Mail at the top.
Step3: Click on Options at the top.
Step4: Click the Server and Folder Information link in the first column.
Step5: Under the Spam folder, select Create a new Spam folder.
Step6: Enter the name Spam and click Ok.
Step7: Click on Folders at the top to see it immediately.
Step8: Logout and login your email account, Spam folder will be available now.