SpamCop FAQ : SpamCop Blocking List information : How do I configure my mailserver to reject mail based on the blocklist? :
To enable the use of DNSBL and the SpamCop Blocking List in Exim, simply:

1. Go into "acl_check_rcpt:"
2. Add:
   deny message = DNSBL listed at $dnslist_domain\n$dnslist_text
   dnslists = sbl.spamhaus.org:bl.spamcop.net:cbl.abuseat.org

The 'message' is what's sent in the SMTP error message to the client, and the
'dnslists' field is a colon seperated list of DNSBL zones.
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