They are very generous with aliases too: 25 mailbox aliases, 50 custom domain aliases. Compare to Proton, which allows only 10 non-revocable aliases for their domains and custom domains combined.

This is on my eval list, though I'm thinking Runbox is above it due to the unlimited aliases/etc. I also like their sub-account pricing structure.

Posteo is also my choice. It's now not only my main E-Mail adress, but also my sync for calendar and adressbook. When i decided not to use Google any more several years ago i considered hosting my own server or use a service. I ended up with Posteo and so far never regret it. Paying 1€/month is a better deal for me than maintaining my own server, as they use their own server which are located in Germany and seem to be really trustworthy.

Another quite similar service in Germany would be mail.de

Ahh I like a lot about this one, it's going into the list, though I think Runbox might be just above it.

Just bear in mind you cannot use custom domains with Posteo due to their privacy rules. This locks you into their service/domain, which might be ok, depending on your requirements.

https://vsx.global/email-provider-test-posteo/

This is spot on, and the top of my list now. Thanks!

Hmm, is something going on with their site? I'm unable to load this.