[exim] Exim SPAM control DNSBL

Hello,

I'm reading the documentation on Exim's websie and I would like for Exim to
Reject messages from senders listed in this DNSBL :
blackholes.mail-abuse.org

What would be the correct way to add this to my exim.conf file? (I'm new to
exim's MTA configuration file)

I added the line bellow just after the begin acl:
deny dnslists = blackholes.mail-abuse.org

Will that do the trick? or what would be the correct implementation?

Also, what other hints would you recommend to fight SPAM?

Regards,

---
Filipe T Miranda