I've been using it for a few years now. The UI is outdated and a bit clunky but it's worked great for me on my old Mac Mini and the old Apple Mail app is pretty

I've been using it for a few years now. The UI is outdated and a bit clunky but it's worked great for me on my old Mac Mini and the old Apple Mail app is pretty much unusable now. My next best option is Roundcube Webmail, and it's pretty good too. I have a hard time with complaining about free software. I either use it or don't, but I won't complain about it.