The guys on the Forefront Server Security support team call out some changes you might be interested in regarding the Spamhaus RBL.
I use the Spamhaus zen list myself and have been very happy with it. However, if you want to narrow your focus and use the sbl, xbl or pbl options, Spamhaus gives you the options to do this.
Check out this blog post on the Forefront Server Security Support Blog over at:
Thomas W Shinder, M.D., MCSE
Sr. Consultant / Technical Writer
Prowess Consulting www.prowessconsulting.com
PROWESS CONSULTING | Microsoft Forefront Security Specialist
Email: [email protected]
MVP – Forefront Edge Security (ISA/TMG/IAG)