Can recommend Runbox for a lot of reasons, but one gotcha that bothered me in day-to-day use was that emails are delayed by a minimum of 30 seconds, with no real upper bound, just a probability curve with, say, the 90th percentile around 5 minutes. On rare occasions, that means OTPs or login links valid for 5 minutes have expired when you get them. Yes this was really on Runbox' side, yes I talked to support, yes they cared, yes they subsequently ghosted me when delivering the requested headers of emails delayed for more than 5 minutes which they considered a normal delay "because email wasn't supposed to be real-time" (be that as it may, that doesn't take away that you sit there 30 seconds... 60 seconds... 90 seconds, wondering if you should go do something else while you wait for the confirmation link and get back to your current task later)

Seriously though, nothing but recommended in every other regard. Alias management, anonymous domains you can use, configuring the sender in Thunderbird no problem, everything else was great. My colleagues didn't seem to mind this delay so much as me so it's something to be aware of but might work fine for you

Edit: I realised this is already like four years ago now, it could have gotten fixed in the meantime. It was an issue for several years before we switched away for some reason related to calendars (don't remember the details, I wasn't my choice)

Recently Runbox had a couple significant outages which made me rethink hosting my email with them. I and my family have used them for many years and I liked what they offered (didn't like bad web UI) but will probably be migrating to Fastmail or other when my current subscription expires.

I was disappointed more by their lack of communication than by the outages. And one outage wasn't even reported on their status page although they confirmed it via support. That's a very bad communication.

I agree, as a happy Runbox customer of several years. But probably the parent post meant non-EEA too, as Norway is effectively subject to any and all EU regulations.