Ask HN: What do you want or not want to see in developer newsletters?

Most (if not all) dev tool companies have developer newsletters for marketing content, and I'm tired of having my inbox filled with a bunch of emails that I almost never read and almost always have to unsubscribe.

But as someone who works closely with marketing teams, I also want to find the right feedback to share with them about how to effectively make their developer newsletters more interesting and impactful.

So what are your thoughts? - What do you want to see in newsletters? - What do you never want to see in newsletters?