I am using Dovecot IMAP on an Debian Sid box. Every major update of this is a big problem. Anyway, it now seems to require a namespace but gives an error is that namespace has a blank prefix. So I am forced to enter SOMETHING. Then it works and my localhost (using KMail) and my Android can use it.
However, KMail tries to open a folder based on that spurious prefix and gives an error box time after time. A harmless pain in the ... The prefix is meant to facilitate a tree of namespaces, I believe, not to designate a mail folder.
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