Anyone have any recommendations that aren't run by Cooper? All of the suggestions so far are run by the same person and while I don't have anything against them personally, a bit of diversity wouldn't hurt :)

This also gave me an "invalid request" response.

Unfortunately we've had endless waves of botnets attempting to subscribe thousands of fake email addresses to us over the years, and while our IP reputation system helps keep this at bay, it's also catching quite a lot of legitimate users now thanks to the prevalance of VPNs. So we'll need to come up with a new approach. (And no, even Cloudflare Turnstile isn't enough to keep them away, sadly, as there are plenty of human-backed adversarial networks too trying to make scam Gmail addresses look legit by subscribing them to newsletters.)

However, we do subscribe many people manually, and we also have RSS - http://javascriptweekly.com/rss - so you don't have to deal with email at all if you don't want to. There are also numerous other options out there, which I've linked in a sibling comment.