FYI, Courier-MTA and Thunderbird sometimes don't play well together. The issue is sometimes there's access issues, or the folders get messed up. I'm pretty sure it might be the fault of Thunderbird, since for IMAP access it wants to use Inbox instead of INBOX. The minimum fallout is sometimes a second but unused folder INBOX will appear on the account folder list on the left sidebar in Thunderbird. This is tolerable. However, sometimes, like in the last few days, Thunderbird will not be able to connect to the mailbox at all. Anyone else have this issue?