diff --git a/install/tpl/postfix_2-10.conf.master b/install/tpl/postfix_2-10.conf.master
index f9f28d89b88c1d29ba76b2fc41e69b193b21e6be..d77f37e0a07bdedea1d15c629a07c871ba496b0c 100644
--- a/install/tpl/postfix_2-10.conf.master
+++ b/install/tpl/postfix_2-10.conf.master
@@ -1,2 +1,5 @@
 # Postfix configuration for version 2.10 and up
 smtpd_relay_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination
+
+# This is supported in version 2.9, but lets not create another conf file for it
+address_verify_sender_ttl = 15686s