For a new user create the archive folder

conf/dovecot-mailboxes.conf

@@ -41,6 +41,10 @@ namespace inbox {
     special_use = \Trash
     auto = subscribe
   }
+  mailbox Archive {
+    special_use = \Archive
+    auto = subscribe
+  }
 
   # dovevot's standard mailboxes configuration file marks two sent folders
   # with the \Sent attribute, just in case clients don't agree about which