Beware, Migadu's biggest drawback, which is not listed, is that customer service is non-existent. You contact them about some questions and wouldn't see any responses, not even an auto reply or a ticket. It looks as if it's run by two or three people who have day jobs and other things to take care of and that Migadu is just a hobby project. Email is way too important for me (and I believe for most people), since it's the key to many online services, to let it be served by someone who's not into it full time.