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Report as Spam
Report as Spam
Most companies use a service to send their newsletters. You should be able to find the IP address from the email headers and then find the abuse email for that company. Email them, tell them you are unable to unsubscribe and their customer is thus sending you spam. Attach the email headers and 90% of the time they will take action (at least from my informal observation when I used to do this).
You can unsubscribe from the mail app I think. If not report as spam
This is a community for designs specifically crafted to make the experience worse for the user. This can be due to greed, apathy, laziness or just downright scumbaggery.