Recently I started a "paper evaluation" of paid, privacy protecting (to a good extent) email services. I found Fastmail to be quite expensive if one needs multi

Recently I started a "paper evaluation" of paid, privacy protecting (to a good extent) email services. I found Fastmail to be quite expensive if one needs multiple accounts. Providers like Protonmail and Tutanota don't support IMAP or any other way to download mails (the web interface and apps are the only choices). That makes it very difficult (or impossible?) to move to another service and take one's older mails along. Protonmail does not support custom domains, whereas Tutanota does. The cheapest solutions I like currently are posteo.de and mailbox.org. I have not started using either of them, but plan to move soon. Posteo does not support custom domains (it is heavily privacy focused and refrains from collecting or storing customer data as much as possible). So your only choice is to use one of many posteo.x domains for the email address. On the other hand, mailbox.org supports custom domains. Both support IMAP, web mail, migrating email from other providers, etc. Both these services and their websites are worth a look, IMO.