While probably no one else cares, I’ll note this for myself so I’ll have somewhere to look later.
Using gentoo, with the most recent muttprint and tetex. I was unable to use muttprint from another program, notably mutt. After debugging a but I realized, what was actually happening was that dvips was dying with an error like “dvips: ! couldn’t open output pipe”.
After a quick google search I learned dvips had a security problem with executing malicious code. So I was able to fix up muttprint to do the right thing.

A few days ago, I finally got around to setting up spamassassin. So far, I have had -0- false positives(mail I wanted, id’ed as junk), and only half a dozen spams get through. This is really remarkable, as I have been getting 100+ per day. It’s such a pleasure to read through my inbox and not have to wade through spam. Thanks to all the folks who create such good software. I am tightening up the filters which should reduce the number of email that get through.