mailcow-dockerized/data/conf/dovecot/config_templates/shared_namespace.conf.j2

{% set MAILDIR_SUB_SHARED = '' if not MAILDIR_SUB else '/' ~ MAILDIR_SUB %}
namespace {
  type = shared
  separator = /
  prefix = Shared/%%u/
  location = maildir:%%h{{ MAILDIR_SUB_SHARED }}:INDEX=~{{ MAILDIR_SUB_SHARED }}/Shared/%%u
  subscriptions = no
  list = children
}