in reply to Email subject lines should be written:
Yes, they should be written. As in "typed in". As long as they are, for all I care people can type them backwards with their nose while on the loo, I'll receive it all in one piece a millisecond or so before the body anyway. Only thing I hate is when they expect me to find stuff they sent me in some attachment months ago without a subject line or, worse, the moronic autogenerated Outlook-style "Ready to send $FILENAME".