Improve logging of Spamhaus DQS lookups without exposing query key (hestiacp#5011)

Author: sahsanu

docs/docs/server-administration/email.md

@@ -64,7 +64,7 @@ When you are done you can check the configuration via [MXToolBox](https://mxtool
 1. Fill in the form and verify your email address by via the link in the email you recive.
 1. Once logged, go to Products → DQS and you will see your Query Key and below you will see the exactly fqdn that you will need to use Zen Spamhaus black list. Something like: `HereYourQueryKey.zen.dq.spamhaus.net`
 1. Edit /etc/exim4/dnsbl.conf and replace `zen.spamhaus.org` with `HereYourQueryKey.zen.dq.spamhaus.net`
-1. Also edit /etc/exim4/exim4.conf.template on the line: `deny    message       = Rejected because $sender_host_address is in a black list at $dnslist_domain\n$dnslist_text` to `deny    message       = Rejected because $sender_host_address is in a black list` to prevent your Query key from leaking
+1. Also edit /etc/exim4/exim4.conf.template on the line: `deny    message       = Rejected because $sender_host_address is in a black list at $dnslist_domain\n$dnslist_text` to `deny    message       = Rejected because $sender_host_address is in a black list at ${if match{$dnslist_domain}{.*zen.dq.spamhaus.*}{zen.dq.spamhaus.net}{$dnslist_domain}}\n$dnslist_text` to prevent your Query key from leaking
 1. Restart exim4 with systemctl restart exim4
 
 ## How do I disable internal lookup for email