[Dovecot] DON'T DELETE THIS MESSAGE?

I have a new install of FC5 running dovecot 1.0.0 beta 2.7. I get my mail with POP3 but I have a user using IMAP. They both work great but I keep getting a message from dovecot in my mail saying DON'T DELETE THIS MESSAGE -- FOLDER INTERNAL DATA. I think it is there to help keep track of IMAP messages. Since I use POP3 is there any way not to have it show up all the time? I've deleted it, I've deleted my account and re-added it but it keeps coming back. Dovecot is also making a 'mail' directory in my ~ that I don't think I need. What can I do about this?

Thanks,

-- Knute Johnson Molon Labe...