The latest eM Client version (7.1.31849.0) appears to have a bug, as it started to sync the folders with NOSELECT flag. Obviously it triggers the access error. Is this a bug that can be removed?
I’ve confirmed with my ISP - the folder actually exists, but shouldn’t be touched by any email client, due to the NOSELECT flag.
It totally looks like eM Client bug, as I’ve checked Outlook, The Bat! and Postbox and all of them behave correctly and don’t interfere with the “banned” folder.