to resolve aliases, a rule must now provide the alias parameter with the

name of the map to use for resolution

src/etc/mail/smtpd.conf

@@ -1,4 +1,4 @@
-#	$OpenBSD: smtpd.conf,v 1.1 2009/03/17 00:00:16 gilles Exp $
+#	$OpenBSD: smtpd.conf,v 1.2 2009/11/03 22:32:10 gilles Exp $
 
 # This is the smtpd server system-wide configuration file.
 # See smtpd.conf(5) for more information.
@@ -7,5 +7,5 @@ listen on lo0
 
 map "aliases" { source db "/etc/mail/aliases.db" }
 
-accept for local deliver to mbox
+accept for local alias aliases deliver to mbox
 accept for all relay