I use Hidden Bar (https://github.com/dwarvesf/hidden) for this. It works well enough despite not being updated in a while, though there is a bit of jank. Just tried out Ice and it seems to be a nice, lower jank replacement! - Source: Hacker News / 14 days ago

I switched to HiddenBar a few years ago when a Bartender licence ran out. It's open source, it's free, and it hasn't been taken over by a new owner who won't identify themselves. https://github.com/dwarvesf/hidden. - Source: Hacker News / 16 days ago

The open-source Hidden Bar is my current solution to this problem, but I think I prefer this native fix. https://github.com/dwarvesf/hidden

  brew install --cask hiddenbar

. - Source: Hacker News / 4 months ago

There's Hidden Bar but I think it's a lot like Bartender. It has an arrow too if that's what you want. Source: about 1 year ago

Hidden is a great free and open-source alternative. Source: about 1 year ago

I’ve been using SpamSieve on my Mac, both on the Mail app on my user account and on Outlook on my wife’s. Source: over 1 year ago

However, to answer the question, there is a third party spam filtering app for MacOS called SpamSieve that does a great job of filtering spam from "ham" (e.g., good mail.) I use it for the ISP mail account that my wife and I share in order to keep us from going insane from the amount of spam that goes to that account - I have a Mac that runs 24/7 running Mail with spamsieve. Source: over 1 year ago

This is just a total workaround, but check out SpamSieve: https://c-command.com/spamsieve/. When I used Mail full time, I found its spam filtering to be pretty effective. Source: over 1 year ago