I think this may have come up before, but not for a while. I'd love a command to set the current message's font to a fixed-width. Handy if you're sent tabulated data, ASCII sketches etc. Eudora and some newsreaders have the feature.
(From a quick glance at the PM Applescript dictionary, I don't think there's a way to script this, but I'm certainly no AS expert.) -- TimH PowerMail 5.5 (build 4456) | OS X 10.4.7 | PowerBook FW/500 | 640MB RAM