[Dovecot] pop3 & imap

Hi,

I use dovecot as pop3 and imap(squirrelmail) server. When I create a folder through webmail and set some sieve rules(fileinto for example), messages will be delivered to that folder by lda, but will not be visibe for pop clients. Is it possible to download these messages ? (Dovecot 1.0, debian etch)

regards