Fix for folders creation

install/ubuntu/16.04/dovecot/dovecot.conf

@@ -2,3 +2,23 @@ protocols = imap pop3
 listen = *, ::
 base_dir = /var/run/dovecot/
 !include conf.d/*.conf
+
+namespace {
+    type = private
+    separator = /
+    prefix =
+    inbox = yes
+
+    mailbox Sent {
+        auto = subscribe
+        special_use = \Sent
+    }
+    mailbox Drafts {
+        auto = subscribe
+        special_use = \Drafts
+    }
+    mailbox Trash {
+        auto = subscribe
+        special_use = \Trash
+    }
+}