SPAM v2.1 has been tested and packaged for AIX v5.2. 
(a client/server build for AIX v5.1, will be available soon)

v2.1 has the following new features:

1)  new user module to collect user and group information
2)  new "modules" parameter in spam2.conf.  This allows the configuration to specify what is collected.
3)  collection ouputs to XML, in addition to plain text.
4)  new "mailToSunday" parameter in spam2rpt.conf.  This allows a list of email addresses to only receive the weekly reports.
5)  new spam2comp that utilizes XML output, providing significantly better comparisons

Please check the Downloads section for the new Client/Server packages.