Another compromise between self hosting and using "big tech" email providers is to use smaller email providers. I have been using https://kolabnow.com/ for a five years or so and am a happy customer. Of course it's more expensive, has less bells and whistles, etc, but I'm glad I don't have to participate in the surveillance capitalism machine of big email providers. - Source: Hacker News / over 1 year ago

BTW: KolabNow is at https://kolabnow.com . I have no connection to them aside from being a customer for many years. Source: over 2 years ago

Likewise, I expected kolab to appear in TFA's list of evaluated options, as I knew it has been around for a while and covered most (all?) of the author's requirements. IIRC it was a key element in Munich's initial 'let's move to GNU/Linux' project, so I imagined it had received a LOT of updates for those few years. The repo [0] looks like it's still getting lots of love. The commercial entity doing much of the... - Source: Hacker News / almost 3 years ago

I don’t know if you’re interested in other software solutions, but my company has been using this AI-powered platform to block phishing emails. I’ve been very impressed with its performance. Threats getting through have dropped to almost nothing since we implemented it. Source: 6 months ago