Index: doc/example-config/conf.d/10-master.conf
--- doc/example-config/conf.d/10-master.conf.orig
+++ doc/example-config/conf.d/10-master.conf
@@ -8,11 +8,11 @@
 
 # Login user is internally used by login processes. This is the most untrusted
 # user in Dovecot system. It shouldn't have access to anything at all.
-#default_login_user = dovenull
+#default_login_user = _dovenull
 
 # Internal user is used by unprivileged processes. It should be separate from
 # login user, so that login processes can't disturb other processes.
-#default_internal_user = dovecot
+#default_internal_user = _dovecot
 
 service imap-login {
   inet_listener imap {
