How to get Spamcop to download already read messages from my mailservers?

Borgholio <[email protected]> Thu, 03 Nov 2005 14:39:56 -0800
Newsgroups gmane.mail.spam.spamcop.email
Organization SpamCop
Message-ID <[email protected]>
Sometimes Spamcop leaves a message or two on my mailserver and marks them as 
read.  Is there any way to get SC to download these messages?  My 
mailserver's webmail app doesn't have a method for marking them as unread.