In more modern times, within the last couple months, there was the Epic/Unreal Engine Github Email Storm[0][1] at minium 60m emails, because a few hundred thousand people were getting over a hundred emails within a minute or so thanks to a user trying to get a minor patch pulled in so they could get some credit/resume line/who knows. They "@"tted the whole membership of the organization. There was a few repeats of the occurrence immediately afterwards as well by some trolls.
A fun aside is the article on wikipedia [1] begins with Jordan Hubbard and ends with Epic:
[0] https://linustechtips.com/topic/1435395-epic-games-github-em...