diff --git a/plinth/modules/email_server/data/etc/dovecot/freedombox-ldap-userdb-aliases.conf.ext b/plinth/modules/email_server/data/etc/dovecot/freedombox-ldap-userdb-aliases.conf.ext
new file mode 100644
index 000000000..c7eb3c369
--- /dev/null
+++ b/plinth/modules/email_server/data/etc/dovecot/freedombox-ldap-userdb-aliases.conf.ext
@@ -0,0 +1,20 @@
+# Direct edits to this file will be lost!
+# Manage your settings on Plinth https://localhost/plinth/apps/email_server
+
+uris = ldap://127.0.0.1
+base = dc=thisbox
+
+user_attrs = \
+  =home=%{ldap:homeDirectory}, \
+  =uid=%{ldap:uidNumber}, \
+  =gid=%{ldap:gidNumber}, \
+  =user=%{ldap:uid}, \
+  =mail=maildir:~/Maildir:LAYOUT=index
+
+user_filter = \
+  (&(objectClass=posixAccount)(!(uidNumber=0))(uidNumber=%n)(!(uid=%n)))
+
+# doveadm -A
+
+iterate_attrs = =user=%{ldap:uid}
+iterate_filter = (objectClass=posixAccount)
diff --git a/plinth/modules/email_server/data/etc/dovecot/freedombox-ldap-userdb.conf.ext b/plinth/modules/email_server/data/etc/dovecot/freedombox-ldap-userdb.conf.ext
index c115853ed..d6e464def 100644
--- a/plinth/modules/email_server/data/etc/dovecot/freedombox-ldap-userdb.conf.ext
+++ b/plinth/modules/email_server/data/etc/dovecot/freedombox-ldap-userdb.conf.ext
@@ -10,7 +10,7 @@ user_attrs = \
   =gid=%{ldap:gidNumber}, \
   =mail=maildir:~/Maildir:LAYOUT=index
 
-user_filter = (&(objectClass=posixAccount)(uid=%Ln))
+user_filter = (&(objectClass=posixAccount)(uid=%Ln)(!(uidNumber=0)))
 
 # For doveadm