Revert "Merge branch '5772-sender-ttl' into 'develop'"

This reverts merge request !1215

Author: Marius Burkard

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