Currently, the POP3 resource doesn't support on-server filtering anymore. One idea here is to use parts of the new filtering framework for Akonadi, developed in last year's summer of code project, for this.
Thank you for the bug report. As this report hasn't seen any changes in 5 years or more, we ask if you can please confirm that the issue still persists. If this bug is no longer persisting or relevant please change the status to resolved.