[CentOS] dovecot question

I am having problems with the dovecot list.  Haven't seen any messages 
from them for a few days, and a message I sent them today is not showing 
in their archives, so I come here to see if anyone here might know....

New mailserver and the first time I am using dovecot.  Previously I used 
courier-mail.  My config is moving all tagged spam into the IMAP spam 
folder.  Very nice for the IMAP users, but not for the POP users.  Of 
course the server don't know, and the mysql database for users does not 
have any flags for this.  Don't want my server to fill up with spam from 
POP users that don't know to check via IMAP. Thunderbird makes it hard 
to switch from POP to IMAP.

So is anyone here using dovecot?  Have they noticed this?  How do you 
handle it?