[ormaaj]

Boss would have to have really stepped way over the line to cross the "ignore" threshold. If I were not in a position to do anything about it I'd ideally be looking for another job before reaching that point.

If you're someone's boss then my expectations of your ability to conduct yourself professionally in everyday email correspondence is higher not lower.

There do exist certain technologies and practices that do in effect impose draconian power over the sender. What I do is not one of them, and if I were to become aware of anything I do to inadvertently impose on others then I would take extraordinary steps to avoid it.