diff -Nru postfix-2.4.5/conf/main.cf postfix-2.4.5-new/conf/main.cf
--- postfix-2.4.5/conf/main.cf	2006-03-25 03:38:54.000000000 +0100
+++ postfix-2.4.5-new/conf/main.cf	2007-08-11 14:51:26.000000000 +0200
@@ -376,6 +376,7 @@
 #alias_maps = hash:/etc/aliases
 #alias_maps = hash:/etc/aliases, nis:mail.aliases
 #alias_maps = netinfo:/aliases
+alias_maps = hash:/etc/postfix/aliases
 
 # The alias_database parameter specifies the alias database(s) that
 # are built with "newaliases" or "sendmail -bi".  This is a separate
@@ -386,6 +387,7 @@
 #alias_database = dbm:/etc/mail/aliases
 #alias_database = hash:/etc/aliases
 #alias_database = hash:/etc/aliases, hash:/opt/majordomo/aliases
+alias_database = $alias_maps
 
 # ADDRESS EXTENSIONS (e.g., user+foo)
 #