diff --git a/mail_system/templates/postfix/main.cf b/mail_system/templates/postfix/main.cf
index 50d157e..e5efdc3 100644
--- a/mail_system/templates/postfix/main.cf
+++ b/mail_system/templates/postfix/main.cf
@@ -87,6 +87,7 @@ smtpd_recipient_restrictions =
 
 smtpd_relay_restrictions =
   permit_mynetworks
+  permit_sasl_authenticated
   reject_non_fqdn_recipient
   reject_unknown_recipient_domain
   defer_unauth_destination