Update dovecot.conf

install/debian/dovecot.conf

@@ -2,3 +2,27 @@ 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
+        }
+        mailbox Junk {
+            auto = subscribe
+            special_use = \Junk
+        }
+    }