I have been searching both the web and Mozilla's site for a pref to manually set digital signing of messages, but to no avail. If I try to do it via the UI, the checkbox only remains selected until I move to another pane, after that it's as empty as can be. I remember the same problem with specifying the "sent" and "drafts" etc folders, and there was a way to manually configure those to work as desired. What prefs drive the digital signatures?
Raivo
