Ask HN: What are some good newsletter etiquette?

I'm pretty sure that unless they ask to be on that mailing list, it wouldn't even be legal to simply add them to it. I suppose that is country dependent, though.

Story time: I asked a Logic Audio plugin developer a question about one of their plugins that I might have been interested in using. They put me on their mailing list without my requesting it, and over time I was getting tens of emails a month from them about that product and others that they had. I was ignoring all of them since they were literal spam about things I simply wasn't interested in.

They got bought out by another company that sold Music e-magazines as well as software, and suddenly I was inundated by spam from all their different areas.

It took me quite a while to get off their lists, and I assured them that because of what they had done, I would never buy anything from them, no matter how incredible or desirable - they'll always have competition, and I'll be going there instead. All because they mishandled my one question about one product of theirs that I didn't even own (and henceforth never will.)