1. Unix-compatible (i.e. written in C or C++, or Perl, or Awk, or ...)
2. Can be run from procmail
3. Doesn't take a guru to install and configure?
I know I can troll thru http://www.sourceforge.net and other sites, but I'm asking my friends for personal testimonials.
This would be running on HPUX 10, if that matters.