Using SORBS with Exim 4.x.
Exim 4.x is a lot more configurable and hence there is more detail to add...

These entries are normally added to the acl_rcpt ACL in the exim.conf file. The default/example exim configuration should contain an example similar to these.

To deny access, using a normal DNSBL with TXT records.

deny            message = Access denied - $sender_host_address\
                          listed by $dnslist_domain\n$dnslist_text
                dnslists = 

This will produce a response similar to the following:
550-Access denied - listed by
550 Test entry. 
To add an X-Warning header so that users can filter:
warn            message = X-Warning: $sender_host_address listed by $dnslist_domain
                log_message = Listed by $dnslist_domain
                dnslists = 
Thanks to Josh Rollyson for the info.

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