Filtering mail messages on ISP's mail server
 

Hi there,

What I would like to do is the following.
I have an email address e.g. me@isp.com. My ISP has given me an alias on this mailbox which my girlfriend uses. (girl@isp.com).
All the messages to the above addresses end up in the same mailbox. But my girlfriend has her own computer with her own mail client. So I only want to retrieve my messages from the mail server and my girlfriend wants only her own messages.

When I was still using Windows (sorry 'bout that) I could use Outlook Express, which had email rules for this purpose. Then I started using Redhat 8 with Kmail. This came with POP filters that did exactly the same. But I wasn't very happy with Redhat, so I decided to try Mandrake 9.1. I'm very happy about it, except for Kmail. For some reason, the POP filters don't work.

Does anyone know how to resolve this. Is it perhaps possible to configure fetchmail in such away that the above can be achieved?
If it is, could you explain this to me. I already tried configuring fetchmail through fetchmailconf and webmin, but I didn't find any settings for filtering.