--- sendmail-8.14.3/cf/feature/block_bad_helo.m4		2006-06-16 00:49:30.000000000 +0200
+++ sendmail-8.14.3/cf/feature/block_bad_helo.m4.ipv6-bad-helo	2010-01-03 23:28:25.000000000 +0100
@@ -16,3 +16,5 @@
 define(`_BLOCK_BAD_HELO_', `')dnl
 RELAY_DOMAIN(`127.0.0.1')dnl
 LOCAL_DOMAIN(`[127.0.0.1]')dnl
+RELAY_DOMAIN(`IPv6:::1')dnl
+LOCAL_DOMAIN(`[IPv6:::1]')dnl