Based on a comment at http://gentoo-portage.com/mail-filter/dspam:
The homepage for dspam needs updating. It's currently
http://dspam.nuclearelephant.com/ but it should be
http://www.nuclearelephant.com/projects/dspam/. Both URLs display the same
content, but a google on 'dspam' turns up the latter.
Steps to Reproduce:
No, google also turns up this one: http://freshmeat.net/projects/dspam/