diff --git a/install/tpl/server.ini.master b/install/tpl/server.ini.master
index 1f7df52936eaee3e08285d57d75fd902517c0981..8231e4acdedf073ed5a6243cfe187f38ff1049cc 100644
--- a/install/tpl/server.ini.master
+++ b/install/tpl/server.ini.master
@@ -32,6 +32,7 @@ monitor_system_updates=y
 module=postfix_mysql
 maildir_path=/var/vmail/[domain]/[localpart]
 homedir_path=/var/vmail
+maildir_format=maildir
 dkim_path=/var/lib/amavis/dkim
 dkim_strength=1024
 pop3_imap_daemon=courier