What about sending crash reports or log files? Or some kind of internal workflow where you need to send something from one PC to another and this is the most convenient solution? (I could imagine some kind of tool that semi-automatically sends email but you don't wanna give it your SMTP credentials so it has to work with your MUA. Sounds weird but these kinds of awful problems with awful solutions exist probably en masse.)

(Addendum: See spacebar heating macro XKCD.)