Plesk 10.4: courier imap with maildrop

[lfrst05]

Hi
I am running Plesk 10.4.4 on Ubuntu 10.4 and I would like to use maildrop to move emails server-side to certain IMAP folders based on the to/from address.
As I was searching for information about this topic, I found this thread: http://forum.parallels.com/showthread.php?t=75090
It is very old but I would like to know if this problem is still present or if there is a better/other solution how I could achieve email filtering?

thanks