Courier-IMAP FAQ
Courier-IMAP uses "INBOX." as the namespace for private folders, and "shared. If you have to explicitly create folders that are subfolders of INBOX,
Uebimiau and courier-imap: cannot create folders - HowtoForge
Uebimiau and courier-imap: cannot create folders General.
Re: [Courier-imap] imap namespaces
Whether or not you may or may not create folders in those namespaces is a separate matter. so, with courier-imap any personal user directory (e.g. the Sent
Postfix Courier Mysql — LinuxTrent
7 Installazione; 8 MySQL; 9 Postfix; 10 Courier-imap; 11 Configurazione MySQL e create con un client di posta che supporti IMAP (anche Imp va benissimo)
keithstric.com - Articles - Setup Courier IMAP with XMail to use
That should create a file called courier-imap-1.6.1.20021211.tar now you need to configure scripts, folder and file permissions and the way XMail works.

Re: [Courier-imap] imap namespaces
Whether or not you may or may not create folders in those namespaces is a separate matter. so, with courier-imap any personal user directory (e.g. the Sent
[Courier-imap] Error creating folders for Virtual Users - Courier
"Your folder could not be created: the IMAP server refused to create it" maillog from Courier when I attempt to create folders, only on the client side.
Postfix Courier Mysql — LinuxTrent
7 Installazione; 8 MySQL; 9 Postfix; 10 Courier-imap; 11 Configurazione MySQL e create con un client di posta che supporti IMAP (anche Imp va benissimo)
keithstric.com - Articles - Setup Courier IMAP with XMail to use
That should create a file called courier-imap-1.6.1.20021211.tar now you need to configure scripts, folder and file permissions and the way XMail works.
Pine with IMAP
The names of Courier-IMAP folders may not contain periods or slashes. Periods are used as hierarchy delimiters - Courier-IMAP and Pine can create folders
Courier-IMAP: BUGS
This is not a list of Courier-IMAP bugs, rather this is a list of bugs in either the think that the folder does not exist, and attempt to create it,
Setting up Courier-IMAP
To define global shared folders, so that each user does not have to run maildirmake --add, create a file /usr/lib/courier-imap/etc/maildirshared.
Neohapsis Archives - Postfix Discussion - #1274 - courier-imap. I
i have installed postfix with courier-imap (mysqlauth). What could this be? I can only create Folders under INBOX. myone email.com