Yeah, I saw that guide. However, maintaining a list of banned domains isn’t an option. It’s impossible to stay ahead of the spammers - we get Spam daily to the addresses that are published on our web site, but at least most of those first go through detection services that we do not maintain i.e. Gmail, miab …
I might get brave enough to try using a Discourse Group email address although I think I can predict that we won’t be able to live with the result. We could always go back to our original process, but I really liked the idea of being able to distribute the work in a natural manner and which preserves the communications.