No matter what remote/local client I use for IMAP it is really slow and courier-imap seems to be killing the connection before anyone can move e-mails into their imap folders. SMTP works fine so I don't think it is qmail. Any idea on how to trace/debug this? I can't find a detailed log file anywhere for courier-imap. And maillog, messages, and secure do not seem to be giving any details about what is going on. According to maillog everything is working properly.
The version of courier-imap I am using comes with Plesk 8.x so it is a modified version (I'm assuming).