This happened at all my previous employers at one point or another. Most famously a thread about unsubscribing from a mailing list that nobody really knew about

This happened at all my previous employers at one point or another. Most famously a thread about unsubscribing from a mailing list that nobody really knew about but had everyone in the company on it. For weeks there'd be some random field sales guy or a marketing person in random parts of the world replying all.