If you could share your personal experience with newsletters, and what makes them good (and bad), I'd love to know your point of view. Thank you!
It might only be me, but this question is silly.
I'm getting the news, updates from a project or company I'm interested in.
Thoughtworks' tech radar is a great example of a project I love getting regular updates from: https://www.thoughtworks.com/radar
Newsletters are not spam, it's a deliberate, on-topic tune-in.