[Dovecot] "leave mail on server" workaround

[Frank Cusack]

On January 10, 2010 1:34:25 AM +0100 Kirill Miazine <km at krot.org> wrote:
> What would be the best way to disallow them using such approach. That
> is, what is the best way to force deletion of messages that have been
> RETRieved in a POP session at the end of that POP session?
>
> RETRieved messages will be marked as \Seen, but since users might also
> use an IMAP client (e.g. webmail), it'll be dangerous to simply delete
> all \Seen messages in user's mailbox.

These two statements seem to be in conflict.  If your users might also
use an IMAP client, why would you delete retrieved messages at all?