Current mailbox.org user for my side accounts, it’s ok, a bit clunky, but reliable & decently priced overall, but it hasn’t sold me enough to move my main account. I also slightly worry about where German politics is potentially headed & what that may mean for it in the long run.

I was considering Proton for a while, but can’t on moral grounds. Tuta sounded like a possibility but I keep seeing mentions of small issues & quirks like you’ve flagged.

The only other main one on my radar currently (that’s not US based) is Infomaniak ksuite, but the package & pricing options are a bit of a confusing mess. I think you need a pro account for a custom domain, & aliases seem a bit limited, but otherwise it’s sounding fairly good, I haven’t seen it mentioned here much but have on the site that shall not be named in amongst the usual suspects. Anyone here use/used it?