I've got Osticket 1.6 running on a CentOS 6.2 server, with Dovecot 2.0.9 and PHP 5.3. Everything is running, but fetching mail locally via a cron job does not work. When setting up the email account in the admin panel, I can submit the changes and see the login happen in the mail logs without a problem. When manually trying to run the cron.php file just as it is in crontab, I get an authentication failure in the mail log and no other messages. Manually telnetting in to that account confirms once again that the account exists and is receiving mail, and that the password is correct.
Where else should I be looking?