[manfre]

If most of the newsletters are coming from the same sources, contact them instead of Google. If you email their abuse@, use a different email address so you can communicate without the risk of delay or filters.

Mass emailers are more motivated than Google with resolving this type of issue.

[golden_abc]

Thanks! I am going to try this.

But I am worried that, in this way I need to contact the sender every time one sign-up my email to newsletter. I was hoping from Google side they can solve this issue once for all. (Spams waste resources of Gmail as well)