[SOLVED] Yet another Dovecot/Thunderbird question

Can anyone help me out on this one? SMTP server works fine and I am able to send messages remotely, but not POP3/IMAP. I couldn't log in for some reason, even if I provide the right credentials.

EDIT: Never mind, looks like the issue I'm encountering has something to do with the first_valid_uid setting. The first virtual server account I made was given the UID of 500, and since Dovecot defaults to a thousand, it wouldn't let me log in even if I use the right credentials.