The problem is that they keep expanding the list of emails and auto-subscribing everyone to each new one. So LinkedIn really is behaving like a bad-faith spammer. And when I click the "unsubscribe" link in the email, I don't get one-click unsubscribed, but instead it just dumps me on the "user preferences" page, then I have to hunt for the email settings and the specific box to uncheck.

The thing that infuriates me the most is when they send me a "reminder" email about an invitation I've already ignored. It's like they expect me to immediately log in and immediately respond to every piece of recruiter spam and "connection request" from people I don't know.

Dear LinkedIn: If I'm ignoring an "invitation", it's because I don't care about it, and I'll just click the "decline" button the next time I happen to log in. I don't want the "invitation reminder" emails, and there is no setting that I can find to unsubscribe from the "reminders".