Thanks so much for pointing this out. I had never heard of it before and had a look. It looks good and has a team whose values I identify with. What's more, it has flexibility in billing that looks quite attractive (users, storage, aliases, etc.).

Unfortunately, it does not support IMAP or POP, which I prefer just to have local copies of mails as a backup.

A paid account looks appropriate (and would help the company stays in business), but it's a bit pricey for my needs (though not as much as other providers who don't have a lot of flexibility on users/storage/aliases).

I will try the free account to experience it firsthand.