use the the default value Postfix uses, please

postfix/postfix.spec

@@ -38,7 +38,7 @@ Class:        BASE
 Group:        Mail
 License:      IPL
 Version:      %{V_postfix}
-Release:      20070801
+Release:      20070806
 
 #   package options
 %option       with_fsl       yes

postfix/postfix.txt

@@ -173,7 +173,7 @@ alias_maps                    = hash:@l_prefix@/etc/postfix/aliases
 alias_database                = hash:@l_prefix@/etc/postfix/aliases
 
 #   local delivery
-#local_recipient_maps         = unix:passwd.byname $alias_maps
+#local_recipient_maps         = proxy:unix:passwd.byname $alias_maps
 recipient_delimiter           = +
 mailbox_command               = @l_prefix@/bin/procmail -a "$EXTENSION"