Clearing content of very full pop3 mailboxes

Hi Group,

I am a newbie, and since I didn't find this in "search", I hope that one of you can give me a hand with this:

How can I clearing content of very full pop3 mailboxes short of deleting the box in file manager? What's going to happen if I delete the box in file manager, do I need to recreate it.............or is that the same as deleting the entire pop3 account and then re-create? Is there a simple and elegant way to do this?

On a related note:
When a forwarder is in place on a pop3 account, will the mailserver retain a copy of each message sent to that pop3 account, and is there a way to "disable" that?

THANK you very much for your assistance,


Pete