Version: (using KDE KDE 3.5.4) Installed from: Ubuntu Packages OS: Linux I haven't found a way to tell KMail to not check a specific folder on startup. I have way too much *archives* folder I want to be able to access but that are unlikely to receive any new mail. I have also a "Public Folder" I'm not allowed to even access and can't unsubscribe. For the later, that means that KMail pops a dialog up that it can't SELECT the folder. More than annoying.
Did you try disabling "Include this folder in mail checks" in the folder properties dialog?
it is "cached IMAP" I don't have that option "act on new/unread" is unchecked.
I see that option in KDE 4.3 for dIMAP.