added no_local_from_check to suppress Sender header

install/0.9.7/rhel/exim.conf

@@ -9,6 +9,7 @@ domainlist relay_to_domains = dsearch;/etc/exim/domains/
 hostlist   relay_from_hosts = 127.0.0.1
 hostlist   whitelist = net-iplsearch;/etc/exim/white-blocks.conf
 hostlist   spammers = net-iplsearch;/etc/exim/spam-blocks.conf
+no_local_from_check
 untrusted_set_sender = *
 acl_smtp_connect = acl_check_spammers
 acl_smtp_mail = acl_check_mail