- replace "all" with "any"

- add examples for how to accept mail from external source and for a
specific domain

src/etc/mail/smtpd.conf

@@ -1,11 +1,16 @@
-#	$OpenBSD: smtpd.conf,v 1.4 2012/07/16 05:56:16 jmc Exp $
+#	$OpenBSD: smtpd.conf,v 1.5 2012/10/11 21:16:28 gilles Exp $
 
 # This is the smtpd server system-wide configuration file.
 # See smtpd.conf(5) for more information.
 
+# To accept external mail, replace with: listen on all
+#
 listen on lo0
 
 map aliases source db "/etc/mail/aliases.db"
 
+# Uncomment the following to accept external mail for domain "example.org"
+#
+# accept from any for domain "example.org" alias aliases deliver to mbox
 accept for local alias aliases deliver to mbox
-accept for all relay
+accept for any relay