Lotus Notes – deleting mail from server ?

I would like to use Lotus Notes for email.

Currently when I use Notes (6.5) it downloads mail from my ISP onto my PC but does not delete/remove the mail from the ISP server. Thus I hit the mail storage limits on the ISP’s server quickly.

With Outlook Express, it downloads the mail and deletes the server copy as soon as it is downloaded as a local copy and so, I have no problems.

Is there an option I havent found to allow Notes to delete the mail on the server once it is downloaded ?

Thanks