Earlier quoted context omitted.
You usually sign up for "company updates" or some such nomenclature, but after Bob's Discount Swords pivots to Improved Plowshares™, it's not really relevant anymore. Then again, I actually fill out that little question after unsubscribing. The above I consider "legit" as long as unsubscribe works.
In my experience, you don't sign up for anything, but are automatically added to mailing lists against your will just for the sin of purchasing something. I never want to get emails from any company just because I purchased 1 item from them. Most people I know tell me they feel the same way, but instead of unsubscribing, they just mark it as spam and eventually it stops showing up in their inbox. If I want emails fro…
Ah: prior commercial relationship. That's not spam, unless they ignore your unsubscribe request.
I hope you're not notifying the world that your preferred supplier of [X] is a spammer. I like to stay on good terms with my preferred suppliers.