--- exim-4.63/src/configure.default~	2006-09-03 19:31:28.000000000 -0700
+++ exim-4.63/src/configure.default	2006-09-03 19:37:42.000000000 -0700
@@ -56,7 +56,7 @@
 # +local_domains, +relay_to_domains, and +relay_from_hosts, respectively. They
 # are all colon-separated lists:
 
-domainlist local_domains = @
+domainlist local_domains = @ : localhost : localhost.localdomain
 domainlist relay_to_domains =
 hostlist   relay_from_hosts = 127.0.0.1