Yes, the unsubcribe link does work. I think the problem is that people are not interested in purchasing the product, so they mark the "your trial is ending" ema

Yes, the unsubcribe link does work. I think the problem is that people are not interested in purchasing the product, so they mark the "your trial is ending" email as spam because it's easy to do. I don't think most people understand the negative impact of marking emails as spam. They simply want to take the path of least resistance.