Milter-greylist

Hi all,

I have just returned from CiscoExpo exhibition - I was quite curious to
see what technology they offer to fight spam. It turned out that they
acquired company Ironport which is looking after senderbase, the most
successful black/whitelist sender database (so they say).

Google says the usage of the senderbase portal should be free so
question is:
- Is it possible to use www.senderbase.org to gather reputation of the
sender and set greylisting constants accordingly to that reputation?
(i.e. the similar way we can do with dnswl or dnsbl)
- Is here anyone who managed to do it? How?
- Any other comments, suggestions?

Thanks,
Ondrej