diff --git a/install_postfix_base.sh b/install_postfix_base.sh
index 5e52522..d71d5dc 100755
--- a/install_postfix_base.sh
+++ b/install_postfix_base.sh
@@ -664,6 +664,12 @@ if $SASL_AUTH ; then
 
 # ============ SASL authentication ============
 
+
+# Allow multiple SASL relay hosts, depending on the sender domain
+#smtp_sender_dependent_authentication = yes
+#sender_dependent_relayhost_maps = hash:/etc/postfix/sender_relay
+
+
 # Enable SASL authentication
 smtp_sasl_auth_enable = yes