--- 1.27/check_mail.conf	2019-09-04 02:53:09.887501857 -0600
+++ 1.28/check_mail.conf	2019-10-02 15:13:06.384429125 -0600
@@ -30,6 +30,7 @@
   ##########################
   # No reverse DNS - add some spam score
   warn
+    condition = ${if !eq{$sender_host_address}{}}
     condition = ${if !eq{$acl_c_esf_skip}{1}}
     condition = ${if !eq{EASY_NO_REVERSE_IP}{0}}
     condition = ${lookup dnsdb{ptr=$sender_host_address}{false}{true}}