Comments by "Mar" (@swunt10) on "GDPR explained: How the new data protection act could change your life" video.

only if they sent you the email without actually having a reason to store your information. so basically all the companies that send these emails, even though the costumer already agreed somewhere to receiving emails from them, didn't have to send them in the first place. everyone else was wrong to even send the emails about the new laws to begin with. so they definitely need to delete you from their lists.
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