Integrating SpamAssassin With James Server 2.3.1

[Benjamin Yeo]

Hi Guys. I've just downloaded  the latest SpamAssassin and I want to
integrate with my mail server James 2.3.1.

I have some questions that I can't seems to find answers to on the wiki of
spamassassin.

Is there blacklisting options that I can use per user that stores this data
in the database? Is there also greylisting options that I can use per user?

For greylisting, I am going to hold the email before sending a verification
check to the sender of the email. When verification is done successfully,
if fail, email will be discarded, if successful, email will then be sent.
Is this at SpamAssassin's level or James's level? I have been trying to
integrate and try out everything but still nothing.

Thanks for looking at this.

Regards.