If a spam folder is not available, you need to create one. Follow the steps below to set up a spam folder in Roundcube webmail:
STEP 1: Go to the cPanel webmail interface and select Roundcube.
STEP 2: Click on Settings.
STEP 3: Navigate to the Folders tab.
STEP 4: Click on the +Create button to add a new folder.
STEP 5: Under Folder Properties, enter "Spam" in the Folder Name field.
STEP 6: Click Save.
The spam folder should now appear in the Folders panel on the left-hand side. Ensure the checkbox under the Subscribed column is selected to activate it.