I receive mails recently that claim they are not spam, because they are not hiding their real address, and one can even unsubscribe clicking a link. If you have some experience with spams, you know that clicking such a link has a special meaning to the sender. It means, “good, this address is valid, so it’s worth sending more mails there”.
Here is what I’m doing with these messages

• mark them as spam on gmail
• put their address here for robots, so the senders will get a taste of receiving spams and not spams but direct marketing mails

And here is the list,

• Management Kiadó: managementkiado.kft@upcmail.hu
• Wellness Hotels: wellnesshotels09@gmail.com wellnesshotels@gmail.com
• Kincsem Wellness Hotel: info@kincsemhotel.hu sales@kincsemhotel.hu