# expensive, you can specify the networks for which a lookup is done, or
# remove the setting entirely.
host_lookup = *
-dns_ipv4_lookup = !localhost
+# dns_ipv4_lookup = !localhost (disabled upon sgrans request, zobel, 2010-03-16)
# If this option is set, then any process that is running as one of the
# listed users may pass a message to Exim and specify the sender's