Sources download can be found at SourceForge's XAMS Download Page.
If you want to view XAMS' development repository visit http://xams.svn.sourceforge.net/.
This Debian package install in one step the complete XAMS solution with spam and virus engines (spamassassin and clamav).
Have a look at debs.xams.org
For more information, look at this file: /usr/share/doc/xams/README.Debian.gz
Do not install this Debian package on a manually installed XAMS 0.1.0. User of the beta package should purge the old package and start a fresh install (before 0.2.1-5).
Reports bugs on the SourceForge Bugs page.