diff --git a/rootfs/etc/confd/templates/master.cf.tmpl b/rootfs/etc/confd/templates/master.cf.tmpl
index 6e7b117..4642318 100644
--- a/rootfs/etc/confd/templates/master.cf.tmpl
+++ b/rootfs/etc/confd/templates/master.cf.tmpl
@@ -1,6 +1,8 @@
 submission  inet  n  - - - -  smtpd
   -o tls_preempt_cipherlist=yes
   -o smtpd_tls_security_level=encrypt
+  -o smtpd_sasl_auth_enable=yes
+  -o smtpd_client_restrictions=permit_sasl_authenticated,reject
 
 smtp      inet  n       -       n       -       -       smtpd
 pickup    unix  n       -       n       60      1       pickup