[ubuntu] Mailserver: move spam to junk folder

view story

http://ubuntuforums.org – I have setup a mail server following these details exactly (with the exception of installing roundcube instead of horde):- www [dot] exratione [dot] com/2012/05/a-mailserver-on-ubuntu-1204-postfix-dovecot-mysql/ Everything is working perfectly from what I can see but need a little help with managing spam email. Currently all spam is just deleted. Instead I would like each user to have a 'Spam' folder along with 'Sent' and 'Trash' and all messages deemed as spam be moved to there. Can anyone suggest the best method to achieve this based on my setup using the above. Many Thanks Har (Hardware)