Hi there.

I've solved now the problem, but it's not really fine yet. The "special-folders" are undeletable in the filesystem, but the Mailclient displays different errormessages for the same action.

I've modified following source files. The new additional lines are similar to the INBOX "lines"

/src/imap/cmd-list.c: 63 /src/imap/cmd-delete.c :20 /src/lib-storage/index/maildir/maildir-storage: 294,308,437,601

Notice that the linenumbers are not really correct, because of the deferrals by inserting new sourcecode.

The new problem is, that the mailclient displays incorrect error messages. When i use another folder caching method i'll get no errors.

Perhaps someone has a better solution, than i?

Thanks Mirko