Simple, simple, simple editors for Linux.
caffeine: I'm pretty sure they sell "e-mail typewriters" for this - a typewriter that you hook up to an e-mail account, and you can see emails come in on it and you can type them back out - and that's it.If not, it can't be hard to customize a linux distribution to do that.EDIT: Or get a typewriter & a fax machine with your fax2email number on speed-dial.