diff --git a/modoboa_installer/scripts/files/postfix/master.cf.tpl b/modoboa_installer/scripts/files/postfix/master.cf.tpl
index af790c1..514ddae 100644
--- a/modoboa_installer/scripts/files/postfix/master.cf.tpl
+++ b/modoboa_installer/scripts/files/postfix/master.cf.tpl
@@ -149,4 +149,4 @@ autoreply unix        -       n       n       -       -       pipe
 %{amavis_enabled}        -o smtpd_client_connection_count_limit=0 
 %{amavis_enabled}        -o smtpd_client_connection_rate_limit=0 
 %{amavis_enabled}        -o receive_override_options=no_header_body_checks,no_unknown_recipient_checks
-%{amavis_enabled}        -o local_header_rewrite_clients=
+%{amavis_enabled}        -o local_header_rewrite_clients=permit_mynetworks,permit_sasl_authenticated