diff --git a/postfix/conf/master.cf b/postfix/conf/master.cf
index 7ff7338e..95aca3c9 100644
--- a/postfix/conf/master.cf
+++ b/postfix/conf/master.cf
@@ -10,6 +10,7 @@ submission inet n       -       n       -       -       smtpd
 smtps     inet  n       -       n       -       -       smtpd
   -o smtpd_tls_security_level=encrypt
   -o smtpd_sasl_auth_enable=yes
+  -o smtpd_tls_wrappermode=yes
   -o smtpd_client_restrictions=permit_sasl_authenticated,reject
 
 # Internal postfix services