use explicit from notation in default config

ok eric@

src/etc/mail/smtpd.conf

@@ -1,4 +1,4 @@
-#	$OpenBSD: smtpd.conf,v 1.12 2019/07/24 15:31:53 kmos Exp $
+#	$OpenBSD: smtpd.conf,v 1.13 2019/11/25 13:30:04 gilles Exp $
 
 # This is the smtpd server system-wide configuration file.
 # See smtpd.conf(5) for more information.
@@ -15,5 +15,5 @@ action "outbound" relay
 # Uncomment the following to accept external mail for domain "example.org"
 #
 # match from any for domain "example.org" action "local_mail"
-match for local action "local_mail"
-match for any action "outbound"
+match from local for local action "local_mail"
+match from local for any action "outbound"