[Dovecot] moving messages with bash

I use bogofilter and a script or two to manage junk mail on my home box (fetchmail from POP3, postfix and procmail to local maildirs, mutt for MUA). Since these mails are just files I figured it never mattered that I moved them from one folder to another via a bash script, but some posts on this list make me think I shouldn't do that on a server running dovecot (IMAP).

What I currently have is a MakeJunk folder (maildir) that I drop spam that was missed into, then a cron job runs mail in that folder through bogofilter and moves it to a Junk folder. Is it sane to do that with simple mv, or do I need to use some special imap command?

Confused, Todd