--- sendmail-8.13.1/cf/m4/proto.m4.localdomain	2007-01-22 16:35:19.000000000 +0100
+++ sendmail-8.13.1/cf/m4/proto.m4	2007-01-22 16:36:47.000000000 +0100
@@ -1840,6 +1840,8 @@
 			$: < ? $&{client_name} > < $1 @ [127.0.0.1] >
 R<@> < $* @ localhost.$m >
 			$: < ? $&{client_name} > < $1 @ localhost.$m >
+R<@> < $* @ localhost.localdomain >
+			$: < ? $&{client_name} > < $1 @ localhost.localdomain >
 ifdef(`_NO_UUCP_', `dnl',
 `R<@> < $* @ localhost.UUCP >
 			$: < ? $&{client_name} > < $1 @ localhost.UUCP >')