$OpenBSD: patch-conf_main_cf,v 1.3 2012/02/02 06:57:39 jakob Exp $
--- conf/main.cf.orig	Tue Dec 18 13:50:25 2007
+++ conf/main.cf	Wed Mar  9 10:46:11 2011
@@ -114,6 +114,9 @@ mail_owner = postfix
 #inet_interfaces = $myhostname
 #inet_interfaces = $myhostname, localhost
 
+# OpenBSD is IPv6-capable - use all available address families.            
+inet_protocols = all                                                       
+
 # The proxy_interfaces parameter specifies the network interface
 # addresses that this mail system receives mail on by way of a
 # proxy or network address translation unit. This setting extends
